A new type of L-Tertiary leucine-derived ligand: Synthesis and application in Cu(II)-catalyzed asymmetric Henry reactions
作者:Zedong Cai、Ting Lan、Pengfei Ma、Jingfang Zhang、Qingqing Yang、Wei He
DOI:10.1016/j.tet.2019.130469
日期:2019.8
of Schiff bases derivedfrom amino acids were developed as chiral ligands for Cu(II)-catalyzed asymmetric Henryreactions. The optimum ligand 7d exhibited outstanding catalytic efficiency in the Cu(II)-catalyzed asymmetric Henry additions of four nitroalkanes to different kinds of aldehydes to produce 76 desired adducts in high yields (up to 96%) with excellent enantioselectivities, up to 99% enantiomeric
Highly efficient and large-scalable glucoamylase-catalyzed Henry reactions
作者:Na Gao、Yan-Li Chen、Yan-Hong He、Zhi Guan
DOI:10.1039/c3ra41287c
日期:——
Eco-friendly, highly efficient and large-scalable Henry reactions of aromatic aldehydes and nitroalkanes catalyzed by glucoamylase from Aspergillus niger (AnGA) are described. The reactions were carried out at 30 °C in the mixed solvents of ethanol and water, and the corresponding β-nitro alcohols were obtained in yields of up to 99%. Only 3 mg of enzyme was sufficient to catalyze the reaction of 1 mmol aldehydes. The natural activity and promiscuous activity of AnGA were compared under different conditions. Experiments demonstrated that the product of the Henry reaction could inhibit AnGA at 80 °C. This enzymatic Henry reaction showed a broad substrate scope, and could be facilely enlarged to gram scale. The possible mechanism was also discussed.