Transition‐Metal‐Free Reduction of
<i>α</i>
‐Keto Thioesters with Hydrosilanes at Room Temperature: Divergent Synthesis through Reagent‐Controlled Chemoselectivities
作者:Rajib Maity、Bhanuranjan Das、Indrajit Das
DOI:10.1002/adsc.201900222
日期:2019.5.14
acid as a promoter can be used for the reagent‐controlled chemoselective reduction at room temperature of conjugated C=C bond, enone moiety, or the carbonyl of (β,γ‐unsaturated) α‐keto thioesters, providing facile access to β,γ‐saturated α‐keto thioesters, α‐hydroxy thioesters, or silyl ethers. The reaction pathway and the chemoselectivity can be fine‐tuned through the judicious choice of the hydrosilane
氢硅烷与布朗斯台德酸或路易斯酸作为促进剂的组合可用于在室温下进行试剂控制的化学选择还原反应,以还原共轭C = C键,烯酮部分或(β,γ-不饱和)α-酮的羰基硫酯,可轻松获得β,γ-饱和的α-酮硫代酯,α-羟基硫代酯或甲硅烷基醚。可以通过明智地选择氢化硅烷或反应条件来微调反应途径和化学选择性。该反应可耐受包括不稳定的硫酯在内的各种官能团,并且通常以中等至极好的收率获得产物。不对称硫醚也可以使用PMHS和催化性B(C 6 F 5)3合成通过两个羰基的还原性脱氧。β,γ-不饱和α-羟基硫代酯和β,γ-饱和α-酮硫代酯的饱和α-酮酰胺的胺介导和无偶联剂的合成突出了其适用性。