Process for the synthesis of pyrazolopyrimidines
First Claim
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1. A PPG phosphoramidite comprising a photolabile hydroxy protecting group, wherein said phosphoramidite nucleoside is of the formula:
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whereinR1 is selected from the group consisting of hydrogen and alkyl;
R2 is selected from the group consisting of hydrogen, alkyl, and an amine protecting group, or R1 and R2 together form an amine protecting group;
each of Z1, Z2, Z4, and Z6 is independently selected from the group consisting of hydrogen, halide, alkyl, —
OR11, wherein each R11 is independently selected from the group consisting of hydrogen, alkyl, and a hydroxy protecting group or two R11 groups form a diol protecting group, or Z2 and Z4 together with the carbon atoms to which they are attached and C-3 carbon atom of the carbohydrate ring form a five-to seven membered ring; and
one of Z3 or Z5 is —
OR12 and the other is —
OR13, where R12 is a photolabile hydroxy protecting group and R13 is a phosphoramidite.
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Abstract
The present invention provides a nucleoside comprising a pyrazolopyrimidine base and a process for producing the same. In particular, the processes of the present invention comprises using a halogenated pyrazolopyrimidine base and removing the halogen after the base is coupled to a sugar moiety. The presence of the halogen on the nucleoside base allows facile and economical production of a large quantity of nucleosides.
42 Citations
56 Claims
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1. A PPG phosphoramidite comprising a photolabile hydroxy protecting group, wherein said phosphoramidite nucleoside is of the formula:
-
wherein R1 is selected from the group consisting of hydrogen and alkyl;
R2 is selected from the group consisting of hydrogen, alkyl, and an amine protecting group, or R1 and R2 together form an amine protecting group;
each of Z1, Z2, Z4, and Z6 is independently selected from the group consisting of hydrogen, halide, alkyl, —
OR11, wherein each R11 is independently selected from the group consisting of hydrogen, alkyl, and a hydroxy protecting group or two R11 groups form a diol protecting group, or Z2 and Z4 together with the carbon atoms to which they are attached and C-3 carbon atom of the carbohydrate ring form a five-to seven membered ring; and
one of Z3 or Z5 is —
OR12 and the other is —
OR13, where R12 is a photolabile hydroxy protecting group and R13 is a phosphoramidite.- View Dependent Claims (2, 3, 4, 5, 6, 44, 45, 46)
wherein R1, R2, Z3 and Z5 are those defined in claim 1.
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3. The PPG phosphoramidite according to claim 2, wherein Z3 is —
- OR13 and Z5 is —
OR12, where R12 is a photolabile hydroxy protecting group and R13 is a phosphoramidite.
- OR13 and Z5 is —
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4. The PPG phosphoramidite according to claim 3, wherein the photolabile hydroxy protecting group is selected from the group consisting of α
- -methyl-6-nitropiperonyloxycarbonyl, 2-(2-nitrophenyl)-2-methylethoxycarbonyl, 2-(2-nitro-6-chlorophenyl)-2-methylethylsulfonyl, and 3′
,5′
-dimethoxybezoinoxycarbonyl.
- -methyl-6-nitropiperonyloxycarbonyl, 2-(2-nitrophenyl)-2-methylethoxycarbonyl, 2-(2-nitro-6-chlorophenyl)-2-methylethylsulfonyl, and 3′
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5. The PPG phosphoramidite according to claim 4, wherein R1 and R2 together form an amine protecting group.
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6. The PPG phosphoramidite according to claim 5, wherein R1 and R2 together form an amine protecting group of the formula:
- ═
CH—
N(CH3)2.
- ═
-
44. The PPG phosphoramidate according to claim 1, wherein R2 is a photolabile amine protecting group, or R1 and R2 together form a photolabile amine protecting group.
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45. The PPG phosphoramidate according to claim 2, wherein R2 is a photolabile amine protecting group, or R1 and R2 together form a photolabile amine protecting group.
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46. The PPG phosphoramidate according to claim 3, wherein R2 is a photolabile amine protecting group, or R1 and R2 together form a photolabile amine protecting group.
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7. A process for producing a non-halogenated nucleoside base containing nucleoside comprising:
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(a) contacting a halogenated nucleoside base with an activated sugar under conditions sufficient to produce a halogenated nucleoside base containing nucleoside; and
(b) reducing said halogenated nucleoside base containing nucleoside under conditions sufficient to produce said non-halogenated nucleoside base containing nucleoside. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A process for producing a nucleoside comprising a hydropyrazolopyrimidine nucleoside base, said process comprising hydrolyzing and reducing or reducing and hydrolyzing an iodopyrazolopyrimidine nucleoside of the formula:
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under conditions sufficient to produce a hydropyrazolopyrimidine nucleoside of the formula;
wherein R1 is selected from the group consisting of hydrogen and alkyl;
R2 is selected from the group consisting of hydrogen, alkyl, and an amine protecting group, or R1 and R2 together form an amine protecting group;
R3 is selected from the group consisting of alkyl, and a hydroxy protecting group; and
each of Y1, Y2, Y3, Y4, Y5, and Y6 is independently selected from the group consisting of hydrogen, halide, alkyl, —
OR4, wherein each R4 is independently selected from the group consisting of hydrogen, alkyl, and a hydroxy protecting group or two R4 groups form a diol protecting group, or Y2 and Y4 together with the carbon atoms to which they are attached to and C-3 carbon atom of the carbohydrate ring form a five-to seven membered ring.- View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
from said hydropyrazolopyrimidine nucleoside, wherein R1 is hydrogen and R2 is an amine protecting group or R1 and R2 together form an amine protecting group; and
one of R9 and R10 is a phosphoramidite and the other is a hydroxy protecting group, said PPG phosphoramidite producing step comprises; (a) (i) contacting said hydropyrazolopyrimidine nucleoside with an amine protecting reagent under conditions sufficient to produce an amine-protected nucleoside of the formula;
(ii) contacting said amine-protected nucleoside with a hydroxy protecting reagent under conditions sufficient to produce an amine/monohydroxy protected nucleoside of the formula;
ori) contacting said hydropyrazolopyrimidine with a hydroxy protecting reagent under conditions sufficient to produce a monohydroxy protected nucleoside of the formula;
(ii) contacting said monohydroxy protected nucleoside with an amine protecting reagent under conditions sufficient to produce an amine/monohydroxy protected nucleoside of the formula;
whereinR1 is hydrogen and R2 is an amine protecting group or R1 and R2 together form an amine protecting group; and
one of R7 and R8 is hydrogen and the other is a hydroxy protecting group; and
(b) contacting said amine/monohydroxy protected nucleoside with an activated phosphoramidite under conditions sufficient to produce said PPG phosphoramidite.
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17. The process of claim 16, wherein said amine protecting reagent is selected from the group consisting of N,N-dialkylformamide dialkylacetal, and N,N-dialkylacetamide dialkylacetal.
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18. The process of claim 16, wherein said hydroxy protecting reagent is a photolabile hydroxy protecting reagent.
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19. The process of claim 18, wherein said photolabile hydroxy protecting reagent is selected from the group consisting of 1-(3,4-methylenedioxy-6-nitrophenyl)ethyl chloroformate, 2-(2-nitrophenyl)-2-methylethyl chloroformate, 2-(2-nitro-6-chlorophenyl)-2-methylethylsulfonyl chloride and 3′
- ,5′
-dimethoxybezoinoxyl chloroformate.
- ,5′
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20. The process of claim 16, wherein said hydroxy protecting reagent is an acid labile hydroxy protecting reagent.
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21. The process of claim 20, wherein said acid labile hydroxy protecting reagent is selected from the group consisting of trityl halide, monomethoxytrityl halide and dimethoxytrityl halide.
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22. The process of claim 16, wherein said activated phosphoramidite is of the formula:
-
wherein X2 is a leaving group.
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23. The process of claim 22, wherein X2 is selected from the group consisting of halide and diisopropylamino.
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24. The process of claim 22, wherein R9 is dimethoxytrityl and R10 is a phosphoramidite moiety of the formula —
- P[N(i-Pr)2]OCH2CH2CN.
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25. The process of claim 13 further comprising producing said nucleoside of Formula I, wherein said nucleoside of Formula I producing step comprises:
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contacting an iodopyrazolopyrimidine of the formula;
with an activated sugar of the formula;
under conditions sufficient to produce said nucleoside of Formula I, wherein R1, R2, R3, Y1, Y2, Y3, Y4, Y5, and Y6 are those defined claim 13; and
X1 is a leaving group.
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26. The process of claim 25 further comprising producing said iodopyrazolopyrimidine nucleoside of Formula I from a pyrimidinone of the formula:
-
said iodopyrazolopyrimidine nucleoside producing process comprising; (i) contacting said pyrimidinone with a halogenating agent and a formylating agent under conditions sufficient to produce a dihalopyrimidine carboxyaldehyde of the formula;
wherein each X3 is independently selected from the group consisting of F, Cl, Br and I;
(ii) contacting said dihalopyrimidine carboxyaldehyde with hydrazine under conditions sufficient to produce a halopyrazolopyrimidine of the formula;
(iii) contacting said halopyrazolopyrimidine with an alkoxide of the formula R3—
OM, wherein R3 is alkyl and M is a metal, to produce an alkoxypyrazolopyrimidine of the formula;
and (iv) iodinating said alkoxypyrazolopyrimidine with an iodinating agent under conditions sufficient to produce said iodopyrazolopyrimidine.
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27. The process of claim 26, wherein said halogenating agent is selected from the group consisting of POCl3, iodine monochloride, N-iodosuccinamide and SOCl2.
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28. The process of claim 26, wherein said formylating agent is a compound comprising a formyl group attached to a secondary amino group.
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29. The process of claim 28, wherein said formylating agent is selected from the group consisting of dimethyl formamide, 1-formylpiperidine, 1-formylmorpholine and triformamide.
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30. The process of claim 26, wherein said iodinating agent is selected from the group consisting of iodine monochloride and N-iodosuccinimide.
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31. A process for producing a nucleoside comprising:
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(a) contacting an iodopyrazolopyrimidine of the formula;
with an activated sugar of the formula;
under conditions sufficient to produce an deoxy iodopyrazolopyrimidine nucleoside of the formula;
(b) producing an amino dihydro hydropyrazolopyrimidine nucleoside from said deoxy iodopyrazolopyrimidine nucleoside, wherein said amino dihydro hydropyrazolopyrimidine nucleoside is of the formula;
wherein R3 is alkyl;
R5 and R6 are hydroxy protecting groups; and
X1 is a leaving group. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
and (e) contacting said amine/monohydroxy protected nucleoside with an activated phosphoramidite of the formula;
under conditions sufficient to produce a PPG phosphoramidite of the formula;
wherein R1 is hydrogen;
R2 is an amine protecting group;
or R1 and R2 together form an amine protecting group;
R4 is a hydroxy protecting group; and
X2 is a leaving group.
-
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34. The process of claim 33, wherein X2 is selected from the group consisting of halide, and —
- N(i-Pr)2.
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35. The process of claim 33, wherein R1 and R2 together form a nitrogen protecting group of the formula:
- ═
CH—
N(CH3)2.
- ═
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36. The process of claim 35, wherein R4 is selected from the group consisting of an acid labile hydroxy protecting group and a photolabile hydroxy protecting group.
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37. The process of claim 36, wherein R4 is selected from the group consisting of dimethoxytrityl, trityl, pixyl, 1,1-bis(4-methoxyphenyl)-1-pyrenylmethyl, α
- -methyl-6-nitropiperonyloxycarbonyl, 2-(2-nitrophenyl)-2-methylethoxycarbonyl, 2-(2-nitro-6-chlorophenyl)-2-methylethylsulfonyl and 3′
,5′
-dimethoxybezoinoxycarbonyl.
- -methyl-6-nitropiperonyloxycarbonyl, 2-(2-nitrophenyl)-2-methylethoxycarbonyl, 2-(2-nitro-6-chlorophenyl)-2-methylethylsulfonyl and 3′
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38. The process of claim 31, wherein said step (b) comprises reducing the iodide by hydrogenation.
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39. The process of claim 31, wherein said iodopyrazolopyrimidine is produced from a pyrimidinone of the formula:
-
said iodopyrazolopyrimidine producing step comprising; (i) contacting said pyrimidinone with a halogenating agent and a formylating agent under conditions sufficient to produce a dihalopyrimidine carboxyaldehyde of the formula;
wherein each X3 is independently selected from the group consisting of F, Cl, Br and I; (ii) contacting said dihalopyrimidine carboxyaldehyde with hydrazine under conditions sufficient to produce a halopyrazolopyrimidine of the formula;
(iii) contacting said halopyrazolopyrimidine with an alcohol of the formula R3—
OH to produce an alkoxypyrazolopyrimidine of the formula;
and (iv) iodinating said alkoxypyrazolopyrimidine with an iodinating agent under conditions sufficient to produce said iodopyrazolopyrimidine.
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40. The process of claim 39, wherein said halogenating agent is selected from the group consisting of POCl3, iodine monochloride, N-idosuccinamide and SOCl2.
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41. The process of claim 40, wherein said halogenating agent is selected from the group consisting of POCl3 and SOCl2.
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42. The process of claim 39, wherein said formylating agent is selected from the group consisting of dimethyl formamide, 1-formylpiperidine, 1-formylmorpholine and triformamide.
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43. The process of claim 39, wherein said iodinating agent is selected from the group consisting of iodine monochloride and N-iodosuccinimide.
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47. A PPG phosphoramidite comprising a hydroxy protecting group, wherein said phosphoramidite nucleoside is of the formula:
-
wherein R1 is selected from the group consisting of hydrogen and alkyl; R2 is selected from the group consisting of hydrogen, alkyl, and an amine protecting group, or R1 and R2 together form an amine protecting group;
each of Z1, Z2, Z4, and Z6 is independently selected from the group consisting of hydrogen, halide, alkyl, —
OR11, wherein each R11 is independently selected from the group consisting of hydrogen, alkyl, and a hydroxy protecting group or two R11 groups form a diol protecting group, or Z2 and Z4 together with the carbon atoms to which they are attached and C-3 carbon atom of the carbohydrate ring form a five-to seven membered ring; and
Z3 is —
OR12 and Z5 is —
OR13, where R12 is a photolabile hydroxy protecting group and R13 is a phosphoramidite.- View Dependent Claims (48, 49, 50, 51)
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52. The PPG phosphoramidate having the formula:
-
wherein R1 is hydrogen and R2 is an amine protecting group, or R1 and R2 together form an amine protecting group, R9 is a phosphoramidite, and R10 is a hydroxy protecting group. - View Dependent Claims (53, 54, 55, 56)
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Specification