Characteristic and complementary chiral recognition ability of four recently developed immobilized chiral stationary phases based on amylose and cellulose phenyl carbamates and benzoates
various immobilizedchiralstationaryphases (CSPs) have been developed. The immobilized CSPs have opened up possibilities not only maintaining the high chiral recognition abilities as well as corresponding coated ones but also affording high durability to various mobile phase. This report directed to investigate enantioseparation of recently launched four immobilized CSPs with cellulose and amylose
Site-selective enzymatic C‒H amidation for synthesis of diverse lactams
作者:Inha Cho、Zhi-Jun Jia、Frances H. Arnold
DOI:10.1126/science.aaw9068
日期:2019.5.10
rings of varying size (see the Perspective by Hepworth and Flitsch). The enzyme directs amidation to the desired position and simultaneously prevents other side reactions. Science, this issue p. 575; see also p. 529 Evolved enzymes selectively form β-, γ-, and δ-lactams from simple precursors. A major challenge in carbon‒hydrogen (C‒H) bond functionalization is to have the catalyst control precisely where