Solid Phase Stepwise Synthesis of Polyethylene Glycols
作者:Ashok Khanal、Shiyue Fang
DOI:10.1002/chem.201703004
日期:2017.10.26
polystyrene solid support. The monomer contains a tosyl group at one end and a dimethoxytrityl group at the other. The Wang resin, which contains the 4‐benzyloxy benzyl alcohol function, was used as the support. The synthetic cycle consists of deprotonation, Williamson ether formation (coupling), and detritylation. Cleavage of PEGs from solid support was achieved with trifluoroacetic acid. The synthesis including
通过在聚苯乙烯固体载体上逐步添加四乙二醇单体来合成聚乙二醇(PEG)以及具有八个和十二个乙二醇单元的衍生物。该单体一端含有甲苯磺酰基,另一端含有二甲氧基三苯甲基。使用含有 4-苄氧基苯甲醇官能团的 Wang 树脂作为载体。合成循环包括去质子化、威廉姆森醚形成(偶联)和去三苯甲基化。用三氟乙酸实现 PEG 从固体支持物上的裂解。包括单体合成在内的合成完全无需色谱法。以高产率获得了两端具有不同功能的 PEG 产物。使用 ESI 和 MALDI-TOF MS 对产物进行分析,发现产物接近单分散性。
Cationic electrocoating compositions
申请人:PPG INDUSTRIES, INC.
公开号:EP0339795B1
公开(公告)日:1993-08-11
US4891111A
申请人:——
公开号:US4891111A
公开(公告)日:1990-01-02
One-pot synthesis of monodisperse dual-functionalized polyethylene glycols through macrocyclic sulfates
oligoethylene glycols, especially hetero-functionalization, provides a series of highly valuable intermediates for life and materials sciences. However, the existing methods for the preparation of these compounds suffer excessive protecting and activating group manipulation as well as tedious purification. Here, a one-pot dual-substitution strategy with macrocyclic sulfates of polyethyleneglycols as the