Trimethylchlorosilane-Mediated Mild α-Chlorination of 1,3-Dicarbonyl Compounds Promoted by Phenyliodonium Diacetate
作者:Yingpeng Su、Yulai Hu、Siying Chong、Lili Wu、Weigang Zhang、Junyan Ma、Xiaowei Chen、Danfeng Huang、Ke-Hu Wang
DOI:10.1055/s-0035-1561572
日期:——
Abstract Trimethylchlorosilane was used as chlorine source for the α-chlorination of 1,3-dicarbonyl compounds with phenyliodonium diacetate as oxidant at room temperature. The reaction allows the selective synthesis of α-monochlorinated products from different kinds of 1,3-dicarbonyl compounds in good yield. The potential possibility of this conversion for bromination has also been investigated. T
a generic, green synthesis of 17 valuable syn-aryl-(2S,3R)-2‑chloro-3‑hydroxy esters (syn-(2S,3R)-1) in 73%-99% isolated yields along with 6.1:1–83:1 dr and 31%∼>99% ee, through dynamicreductivekineticresolution of racemic aryl α‑chloro β-keto esters (2) catalyzed by an engineered ketoreductase which was obtained via epPCR-based directed evolution. The hectogram scale synthesis of syn-(2S,3R)-1b
A simple and efficient transformation of Fischer carbene complexes into bromomethyl ketones or β-ketoesters
作者:JoséM Concellón、Pablo L Bernad
DOI:10.1016/s0040-4039(98)01732-8
日期:1998.10
Fischer-type carbene complexes react via nucleophilic attack with dibromomethyllithium or haloester lithium enolates to afford bromomethyl ketones or beta-ketoesters, respectively, (C) 1998 Elsevier Science Ltd. All rights reserved.