Synthesis of heterotelechelic poly(ethylene glycol) derivatives having α-benzaldehyde and ω-pyridyl disulfide groups by ring opening polymerization of ethylene oxide using 4-(diethoxymethyl)benzyl alkoxide as a novel initiator

被引:47
作者
Akiyama, Y
Nagasaki, Y
Kataoka, K
机构
[1] Univ Tokyo, Grad Sch Engn, Dept Mat Sci, Bunkyo Ku, Tokyo 1138656, Japan
[2] Sci Univ Tokyo, Dept Mat Sci & Technol, Chiba 2788510, Japan
关键词
D O I
10.1021/bc0341775
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
New heterotelechelic PEG-containing benzaldehyde and 2-pyridyldithio endgroup (CHO-Bz-PEG-SSpyl) was synthesized with high efficiency and high selectivity. An alpha-benzylacetal-omega-methansulfonyl PEG was prepared as the first step to CHO-Bz-PEG-SSpyl through the ring-opening polymerization of ethylene oxide (EO) initiated by potassium 4-(diethoxymethyl)benzyl alkoxide (PDA), followed by the successive conversion of the end-alkoxide group to a methanesulfonyl group and then to dithiocarbonate derivative. Further, deprotection of the dithiocarbonate derivative and subsequent conversion to the 2-pyridyldithio group at the omega-end was successfully performed through a one-step reaction to form alpha-benzylacetal-omega-2-pyridyldithio PEG (aceBz-PEG-SSpyl). The aceBz-PEG-SSpyl was then treated with an aqueous HCl solution (pH 5.0) to generate the benzaldehyde group at the a-end. Molecular functionalities of the benzaldehyde and the 2-pyridyldithio end group of the heterotelechelic PEG (CHO-Bz-PEG-SSpyl) thus prepared were characterized by H-1 and C-13 NMR, showing that the reaction proceeded almost quantitatively. The benzaldehyde end group is available to conjugate various ligands having a primary amino group by forming the pH-sensitive imine linkage (-N=CHC6H4-).
引用
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页码:424 / 427
页数:4
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