Direct Synthesis of γ‐Keto Sulfones from Allylic Alcohols: One‐Pot Palladium(II)‐Catalyzed Generation of Enones Followed by Water‐Mediated 1,4‐Addition of Organosulfinates
作者:Mari Vellakkaran、Murugaiah M. S. Andappan、Kommu Nagaiah、Jagadeesh Babu Nanubolu
DOI:10.1002/ejoc.201600494
日期:2016.7
which indicated a chemoselective catalytic system for the preparation of halogen-bearing γ-keto sulfones. This one-pot method does not require an acid, a base, or isolation of any intermediate. Control experiments indicated that the active catalyst of the first step also promoted the subsequent C–S bond-formation reaction. Water was found to accelerate the reaction rate and to be involved in the protonolysis
烯丙醇被用作γ-酮砜的合成前体。该反应涉及通过使用 PdII-双氧催化系统和随后在水存在下的磺胺-迈克尔加成,从烯丙醇原位一锅生成 α,β-烯酮。重要的是,水被确定为有毒铜盐的可持续替代品,以促进有机磺酰基的添加。制备了芳香族和脂肪族 γ-酮砜的各种例子。特别是,Ar-X (X = Br, Cl) 键是可以耐受的,这表明它是一种用于制备含卤素 γ-酮砜的化学选择性催化体系。这种一锅法不需要酸、碱或任何中间体的分离。对照实验表明,第一步的活性催化剂也促进了随后的 C-S 键形成反应。