Remarkable steric and electrostatic effects of acyl groups and exceptionally bulky Lewis acid, (MABR), which make the rearrangement reaction applicable to various types of reaction systems including acyclic ones in the acid-promoted rearrangement of α,β-epoxy acylates, were found.
Diastereoselective Hydrogenation of Tetrasubstituted Olefins using a Heterogeneous Pt‐Ni Alloy Catalyst
作者:William A. Swann、Anish Yadav、Nicholas B. Colvin、Nicole K. Freundl、Christina W. Li
DOI:10.1002/anie.202317710
日期:2024.5.6
A Pt−Ni alloy nanocatalyst is developed for the diastereoselective directed hydrogenation of tetrasubstituted olefins in a cyclopentene scaffold. For this substrate class, established homogeneous catalysts generate hydrogenolysis side products, and commercial heterogeneous catalysts are not stereoselective. Uniform alloying of the noble metal and base metal combined with high catalyst dispersion is
The rearrangement reaction of alpha,beta-epoxy acylates in cyclic systems was studied. The treatment of cis-derivatives with a Lewis acid afforded rearranged products via the regioselective B-cleavage of the oxirane ring due to the electron-withdrawing nature of the acyloxy group, whereas trans-derivatives enhanced the neighboring group participation to yield only a small amount of rearranged products. This rearrangement reaction proved to be useful for the construction of st variety of spirocyclane systems or quaternary carbon centers on rings and could be applied to their syntheses as optically active forms.
COMPOUNDS USEFUL AS MODULATORS OF TRPM8
申请人:Senomyx, Inc.
公开号:EP3356356A1
公开(公告)日:2018-08-08
CYCLIC OXY ETHER COMPOUNDS AS PERFUMING INGREDIENTS