A new silver-catalyzed highly regio- and stereoselective difunctionalization reaction of simple terminal alkynes was reported in which the (Z)-β-haloenol acetate derivatives were formed efficiently. The resulting products were versatile intermediates in organic synthesis.
Catalyst- and Metal-Free Rapid Functionalizations of Alkynes Using TsNBr2
作者:Lal Yadav、Ruchi Chawla、Atul Singh
DOI:10.1055/s-0033-1339194
日期:——
A very rapid (3–12 min) and efficient method has been developed for a one-potsynthesis of α,α-dibromoalkanones and β-bromoenol alkanoates directly fromalkynes using N , N -dibromo- p -toluenesulfonamide (TsNBr 2 ). The protocol is embellished with features like ambient temperature, high regioselectivity, operational simplicity, and metal- and catalyst-free conditions.
已经开发了一种非常快速(3-12 分钟)且有效的方法,用于使用 N , N - 二溴对甲苯磺酰胺 (TsNBr 2 ) 直接从炔烃一锅合成 α,α-二溴链烷酮和 β-溴烯醇链烷酸酯。该协议具有环境温度、高区域选择性、操作简单以及无金属和无催化剂条件等特点。
Highly efficient synthesis of 2,5-disubstituted pyrazines from (Z)-β-haloenol acetates
作者:Zhengwang Chen、Dongnai Ye、Guohai Xu、Min Ye、Liangxian Liu
DOI:10.1039/c3ob41164h
日期:——
A highly efficient synthesis of a wide range of 2,5-disubstituted pyrazines from (Z)-β-haloenol acetates is described. The reactions are conducted under convenient conditions and provide products with excellent regioselectivity in moderate to excellent yields with a broad substrate scope, including a variety of aromatic and aliphatic haloenol acetates.