在无溶剂条件下,三氟甲磺酸镓(III)催化环氧化物的开环可提供具有高区域选择性和化学选择性的β-羟基硫化物,产率高(84-97%)。另外,首次开发了在单一水中合成β-羟基亚砜的简单,有效且对环境无害的一锅法。通过H 2 O 2 -Ga(OTf)3系统的促进,该过程以高收率(81-94%)和高化学选择性提供了β-羟基亚砜,而没有检测到对β-羟基砜的过度氧化。反应后催化剂可以容易地回收并重新使用而没有明显的活性损失。
photochemical thiol addition/aerobic oxidation cascade reaction has been developed. This protocol enables efficient oxidative coupling of epoxides and thiols to access structurally valuable β-hydroxylsulfoxides. A broad range of functional groups are compatible to obtain moderate to good yields of the target products. Mechanistic studies revealed a sequential reaction pathway involving base-promoted thiol addition
Catalyst-free oxidation of sulfides to sulfoxides and diethylamine catalyzed oxidation of sulfides to sulfones using Oxone as an oxidant
作者:R. V. Kupwade、S. S. Khot、U. P. Lad、U. V. Desai、P. P. Wadgaonkar
DOI:10.1007/s11164-017-3026-0
日期:2017.12
journey from the failure of our attempts in controlled oxidation of sulfides to sulfoxides using an Oxone®–KBr combination to our success in the development of a catalyst-free protocol for the oxidation of sulfides to sulfoxides using Oxone as an oxidant. We also describe the failure of our attempts at the oxidation of sulfides to sulfonesusing an excess of Oxone–KBr as well as Oxone, and our success