已公开了一种由手性双官能胺方酸方胺催化剂催化的亚硝基芳烃与羟基马来酰亚胺的不寻常且高度有效的不对称环化反应。直接和有效地制备了具有两个连续的季位立体中心和多功能基团的各种高度融合的手性N-羟基二氢吲哚,具有良好的收率(高达99%),具有完全的区域选择性环化和出色的立体选择性(高达> 99:1 dr 99%ee)。通过精细地转化为一系列新的手性二氢吲哚,可以很好地证明新反应和目标手性实体的效率和潜力。
An umpolung approach to amides via hypervalentiodine-mediatedoxidative rearrangement of N–H ketimines under mild reaction conditions is described. This strategy provides target amides with excellent selectivity in good yields. In addition, preliminary mechanistic studies demonstrated that the migration preference depends on both steric and electronic effects of the migrating groups.
Ligand-free copper-catalyzed direct amidation of diaryliodonium salts using nitriles as amidation reagents
作者:Hui-cheng Cheng、Lichao Zhou、Xuming Zhou、Jiao-li Ma、Penghu Guo、Yang Zhang、Hong-bing Ji
DOI:10.1016/j.tetlet.2021.153048
日期:2021.5
efficient and practical methodology for the synthesis of N-arylamides has been developed via copper-catalyzed amidation of diaryliodonium salts with nitriles. Various substituted aryl nitriles and aliphatic nitriles could be applied in the reaction, providing a series of N-arylated amides in moderate to good yields. This procedure provides an alternative route for the synthesis of various N-arylamides
Method of catalytic crosslinking of polymers and two-pack composition used therein
申请人:ROHM AND HAAS COMPANY
公开号:EP0950669A2
公开(公告)日:1999-10-20
A method of crosslinking an oxidative polymer having oxidatively crosslinkable functional groups and a two-pack composition used therein. The oxidatively crosslinkable functional groups on the oxidative polymer are crosslinked by contacting the oxidative polymer with a catalytic amount of an oxidizing enzyme, such as horseradish peroxidase. The present invention is further directed to a two-pack coating composition which includes a polymeric component and a catalytic component, which are mixed together prior to use.