Preparation of spiro[indole-3,5′-isoxazoles] <i>via</i> Grignard conjugate addition/spirocyclization sequence
作者:Alexander V. Aksenov、Dmitrii A. Aksenov、Nicolai A. Aksenov、Anton A. Skomorokhov、Elena V. Aleksandrova、Michael Rubin
DOI:10.1039/d0ra10219a
日期:——
A highly efficient one-pot procedure combining conjugate addition of Grignardreagents to (2-nitroalkenyl)indoles and sub-sequent Brønsted acid-assisted spirocyclization allowed for preparation of 4'H-spiro[indole-3,5'-isoxazoles] in a diastereomerically selective fashion. Utilization of alkyl Grignardreagents provided an easy access to 4'-alkylsubstituted derivatives hardly available by other means