Chemoselective debenzylation involving removal of a 2-hydroxy-1-phenylethyl group from nitrogen
摘要:
In 2-(2-hydroxy-1-phenylethyl)-1-isoindolinone, selective removal of the 2-hydroxy-1-phenylethyl group is conveniently achieved via a 3-step sequence (mesylation, elimination, hydrolysis) without breaking an endocyclic benzylic nitrogen bond. (C) 1997 Elsevier Science Ltd.
unit appended on the single-carbon linker, the ligand harbors an unusually rigid backbone that presumably stabilizes its complexation with transition metals during catalysis. Compared with the known dppm ligand, it exhibited superior reactivity and regioselectivity in a number of alkene hydrofunctionalization reactions, catalyzed by iridium and rhodium.
Development and Mechanistic Studies of the Iridium‐Catalyzed C−H Alkenylation of Enamides with Vinyl Acetates: A Versatile Approach for Ketone Functionalization
作者:Bo Zhou、Xiaotian Qi、Peng Liu、Guangbin Dong
DOI:10.1002/anie.202107331
日期:2021.9.13
Ketone functionalization is a cornerstone of organic synthesis. Herein, we describe the development of an intermolecular C−H alkenylation of enamides with the feedstock chemical vinyl acetate to access diverse functionalized ketones. Enamides derived from various cyclic and acyclic ketones reacted efficiently, and a number of sensitive functional groups were tolerated. In this iridium-catalyzed transformation
Chemoselective debenzylation involving removal of a 2-hydroxy-1-phenylethyl group from nitrogen
作者:Olivier Fains、John M Vernon
DOI:10.1016/s0040-4039(97)10163-0
日期:1997.11
In 2-(2-hydroxy-1-phenylethyl)-1-isoindolinone, selective removal of the 2-hydroxy-1-phenylethyl group is conveniently achieved via a 3-step sequence (mesylation, elimination, hydrolysis) without breaking an endocyclic benzylic nitrogen bond. (C) 1997 Elsevier Science Ltd.
Branched-Selective Intermolecular Ketone α-Alkylation with Unactivated Alkenes via an Enamide Directing Strategy
作者:Dong Xing、Guangbin Dong
DOI:10.1021/jacs.7b08581
日期:2017.10.4
We describe a strategy for intermolecular branched-selective α-alkylation of ketones using simple alkenes as the alkylating agents. Enamides derived from isoindolin-1-one provide an excellent directing template for catalytic activation of ketone α-positions. High branched selectivity is obtained for both aliphatic and aromatic alkenesusing a cationic iridium catalyst. Preliminary mechanistic study