Chirality transfer in palladium catalyzed reactions of allylammonium salts
摘要:
Optically active 1-isobutyl-2(Z)-butenyltrimethylammonium iodide (10) underwent allylation with dimethyl sodiomalonate in the presence of a palladium(0) catalyst. The reaction proceeded predominantly with 1,3 transposition and with inversion of configuration due probably to a prior isomerization from anti to syn-pi-allylpalladium intermediate (14-->15). The stereochemistry observed in the reaction with phenylzinc chloride was opposite to that with the soft nucleophile.
Deaminative Arylation and Alkenyaltion of Aliphatic Tertiary Amines with Aryl and Alkenylboronic Acids via Nitrogen Ylides
作者:Jianke Su、Chengbo Li、Xinyuan Hu、Yu Guo、Qiuling Song
DOI:10.1002/anie.202212740
日期:2022.12.23
arylation and alkenylation of tertiary amines with aryl and alkenylboronic acids is enabled by difluorocarbene under transition-metal-free conditions. This protocol represents a novel reaction mode which succeeded in the construction of Csp3−Csp2 bonds via an in situ formed nitrogen ylide from tertiary amines (propargylamines, allylamines and 1H-indol-3-yl methane amines) and difluorocarbene with aryl and
在无过渡金属的条件下,二氟卡宾能够实现叔胺与芳基和烯基硼酸的有效且通用的脱氨芳基化和烯基化。该协议代表了一种新的反应模式,它通过叔胺(炔丙基胺、烯丙基胺和 1H-吲哚-3-基甲烷胺)和二氟卡宾原位形成的氮叶立德成功地构建了 C sp 3 -C sp 2键与芳基和烯基硼酸。
40. Synthetic mydriatics. Diphenylchloroacetyl chloride as a reagent for the preparation of benzilic esters of tertiary amino-alcohols