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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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.
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Citations
43 Claims
- 1. A PPG phosphoramidite comprising a photolabile hydroxy protecting group, wherein said phosphoramidite nucleoside is of the formula:
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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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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)
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Specification