A Diastereoselective Assembly of Tetralone Derivatives via a Tandem Michael Reaction and <i>ipso</i>-Substitution of the Nitro Group
作者:Nicolai A. Aksenov、Dmitrii A. Aksenov、Daniil D. Ganusenko、Igor A. Kurenkov、Alexander V. Aksenov
DOI:10.1021/acs.joc.3c00134
日期:2023.5.5
A highlydiastereoselective tandem reaction of 2′-nitrochalcones is reported, involving Michael addition and a subsequent ipso-substitution of the nitro group to produce 1-tetralones with two contiguous chiral centers. A related annulation reaction of 2′-nitrochalcones with potassium cyanide affording 1-indanones with a C3-quaternary chiral center is also demonstrated.
Unexpected cyclization of <i>ortho</i>-nitrochalcones into 2-alkylideneindolin-3-ones
作者:Nicolai A. Aksenov、Dmitrii A. Aksenov、Nikolai A. Arutiunov、Daria S. Aksenova、Alexander V. Aksenov、Michael Rubin
DOI:10.1039/d0ra03520c
日期:——
An original, facile, and highly efficient method for the preparation of 2-(3-oxoindolin-2-ylidene)acetonitriles from ortho-nitrochalcones is described. The featured transformation is a triggered Michael addition of the cyanide anion to the chalcone followed by a cascade cyclization mechanistically related to the Baeyer–Drewson reaction.