Photo-mediated [1, 3]-Carbonyl shift of β-Ketocarbonyls
作者:Wenzhao Zhang、Yao Li、Sanzhong Luo
DOI:10.1016/j.jphotochem.2020.112553
日期:2020.6
An organic amine mediated photolytic [1,3]-benzoyl migration of β-benzoyl carbonylcompounds was reported. This migration was achieved by Norrish-Yang cyclization and retro-aldol reaction under black light (365 nm) or visible light irradiation. This photolytic protocol provides an alternative approach to the synthesis of 1,5-dicarbonyl compounds. By chiral primary amine catalysis, a kinetic resolution
Type II photoreactions of α-alkyl β-oxoesters. Neighboring group effect on 1,4-biradical reactions and effective internal filter effect by the type II photoproduct
The α-alkyl β-oxoesters 1 undergo typeIIphotoreactions. The process of back hydrogen transfer in the 1,4-biradical intermediate to revert to the starting ester is suppressed because of the intramolecular hydrogen bonding between the hydroxyl and carboalkoxyl groups in the biradical intermediate. The hydrogen bonding determines the stereochemistry of 1,4-biradical cyclization. The cyclobutanols having