申请人:Colorado State University Research Foundation
公开号:US20180244841A1
公开(公告)日:2018-08-30
B/N Lewis pairs have been discovered to catalyze rapid epimerization of meso-lactide (LA) or LA diastereomers quantitatively into rac-LA. The obtained rac-LA can be kinetically polymerized into poly(
L
-lactide) and optically resolved
D
-LA, with a high stereoselectivity factor k
L
/k
D
of 53 and an ee value of 91% at 50.6% monomer conversion, by a bifunctional chiral catalyst. The epimerization and enantioselective polymerization can be coupled into a one-pot process for transforming meso-LA directly into poly(
L
-lactide) and
D
-LA.
B/N路易斯对被发现可以催化快速地将meso-丙交酯(LA)或LA对映异构体定量地转化为rac-LA。获得的rac-LA可以通过双功能手性催化剂进行动力学聚合,形成聚(L-丙交酯)和光学纯的D-LA,具有高对映选择性因子kL/kD为53,ee值为91%,在50.6%单体转化率下。通过将外消旋化和对映选择性聚合耦合到一个一锅过程中,可以直接将meso-LA转化为聚(L-丙交酯)和D-LA。