A palladium-catalyzed thiocarbonylation of styrene derivatives is reported for the first time. The combination of thiols as nucleophiles and a bidentate ligand ensures a unique reaction outcome with high regioselectivity toward the more valuable branched isomer and new reactivity. The ambient reaction conditions (temperature, catalyst loading) and the use of a CO surrogate render this transformation
首次报道了钯催化的苯乙烯衍生物的硫代羰基化。作为亲核试剂的硫醇和双齿配体的组合确保了独特的反应结果,对更有价值的支链异构体和新的反应性具有高区域选择性。环境反应条件(温度、催化剂负载)和 CO 替代物的使用使这种转化成为从可用原料合成硫酯的有用方法。该系统可以容忍芳烃和硫醇取代基上的各种官能团。值得注意的是,具有挑战性的邻位取代苯乙烯以前所未有的高区域选择性转化。
The Cp2ZrCl2-catalyzed cycloalumination of functionally substituted olefins with triethylaluminum
作者:I. R. Ramazanov、R. N. Kadikova、U. M. Dzhemilev
DOI:10.1007/s11172-011-0243-3
日期:2011.8
Reactions of functionally substituted olefins (allylamines, sulfides and ethers, homoallylic alcohols and amines, as well as vinyl ethers) with Et3Al in the presence of Cp2ZrCl2 as a catalyst were studied. Cycloalumination of allylamines occurs with high regioselectivity to furnish after subsequent deuterolysis 4-deutero-2-(deuteromethyl)butyl-substituted amines. Cycloalumination of alkyl allyl sulfide is accompanied by a side process of the C-S bond cleavage. In the case of allyl and vinyl ethers, no cycloalumination products are formed under the reaction conditions. However, the reactions with homoallylic alcohol and amine after deuterolysis gave the corresponding dideutero-containing compounds in good yields.