Substrate Engineering in Lipase-Catalyzed Selective Polymerization of <scp>d</scp>-/<scp>l</scp>-Aspartates and Diols to Prepare Helical Chiral Polyester
作者:Yu Zhang、Bo Xia、Yanyan Li、Xianfu Lin、Qi Wu
DOI:10.1021/acs.biomac.0c01605
日期:2021.2.8
The synthesis of optically pure polymers is one of the most challenging tasks in polymer chemistry. Herein, Novozym 435 (Lipase B from Candida antarctica, immobilized on Lewatit VP OC 1600)-catalyzed polycondensation between d-/l-aspartic acid (Asp) diester and diols for the preparation of helical chiral polyesters was reported. Compared with d-Asp diesters, the fast-reacting l-Asp diesters easily
光学纯聚合物的合成是聚合物化学中最具挑战性的任务之一。在此,报道了Novozym 435(来自南极假丝酵母的脂肪酶B ,固定在Lewatit VP OC 1600上)催化d / l-天冬氨酸(Asp)二酯和二醇之间的缩聚反应,以制备螺旋型手性聚酯。与d- Asp二酯相比,快速反应的1 - Asp二酯容易与二醇反应,以提供一系列含有N-取代的1- Asp重复单元的手性聚酯。除了氨基酸构型,N还研究和优化了取代基的侧链和二醇的链长。结果发现,像N- Boc和N- Cbz这样的大面积酰基N-取代基比小的基团更有利于该聚合反应,这可能是由于这些小酰基与Novozym 435的活性位点竞争性结合所致。达到39.5×10 3 g / mol(M w,Đ = 1.64)。此外,慢反应d-Asp二酯还通过修饰底物结构成功地聚合,以人工创建“非手性”缩合环境。这些对映体互补手性聚酯具有热稳定性,并具有特定的