Method for producing polyalkylene glycol derivative having amino group at end
First Claim
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1. A method for producing a polyalkylene glycol derivative having an amino group at an end, comprising the following [Step 1] to [Step 4]:
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Abstract
A method simply produces a narrowly distributed and high-purity polyalkylene glycol derivative having an amino group at an end without using a heavy metal catalyst. A method for producing a polyalkylene glycol derivative having an amino group at the end by reacting a compound represented by the general formula (V) with an alkylene oxide, then reacting a reaction product with an electrophile represented by the general formula (I), and deprotecting the obtained product without using a heavy metal:
RA3O(RA4O)k-1RA4O−M+ (V)
- wherein RA3 represents a linear, branched, or cyclic hydrocarbon group having 1 to 20 carbon atoms; RA4 represents an alkylene group having 2 to 8 carbon atoms; k represents an integer of 2 to 5; and M represents an alkali metal;
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- wherein RA1a and RA1b each independently represent a protective group of the amino group, or one of RA1a and RA1b represents H and the other represents a protective group of the amino group, or RA1a and RA1b bind to each other to form a cyclic protective group, and the protective group is deprotectable without using a heavy metal; RA2 represents a linear, branched, or cyclic hydrocarbon group having 1 to 6 carbon atoms; and X represents a leaving group.
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Citations
16 Claims
- 1. A method for producing a polyalkylene glycol derivative having an amino group at an end, comprising the following [Step 1] to [Step 4]:
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16. A method for producing a polyalkylene glycol derivative of formula (II), comprising the following [Step 1] to [Step 3]:
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[Step 1] a step of reacting a compound of formula (IV) with an alkali metal or an alkali metal compound selected from M, M+H−
, RX−
M+, [RY]⋅
−
M+, and RZO−
M+ (wherein M represents an alkali metal, RX represents an alkyl group having 1 to 20 carbon atoms, or an arylalkyl group having 7 to 20 carbon atoms, RY represents an aromatic compound that may have a substituent, and RZ represents an alkyl group having 1 to 6 carbon atoms) to obtain a compound of formula (V);
RA3O(RA4O)kH
(IV)wherein RA3 represents a linear hydrocarbon group having 1 to 20 carbon atoms, or a branched or cyclic hydrocarbon group having 3 to 20 carbon atoms; and RA4 represents an alkylene group having 2 to 8 carbon atoms, and k represents an integer of 2 to 5;
RA3O(RA4O)k-1RA4O−
M+
(V)wherein RA3, RA4, and k are the same as defined in formula (IV); and M is the same as defined for the alkali metal or the alkali metal compound; [Step 2] a step of reacting the compound of formula (V) with an alkylene oxide in a polymerization solvent to obtain a compound of formula (VI);
RA3O(RA4O)n-1RA4O−
M+
(VI)where RA3 and RA4 are the same as defined in formula (IV); M is the same as defined for the alkali metal or the alkali metal compound; and n represents an integer of 3 to 450; and [Step 3] a step of reacting the compound of formula (VI) with an electrophile of formula (I-I-I) to obtain a compound of formula (II);
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Specification