CH Alkenylations with Alkenyl Acetates, Phosphates, Carbonates, and Carbamates by Cobalt Catalysis at 23 °C
作者:Marc Moselage、Nicolas Sauermann、Sven C. Richter、Lutz Ackermann
DOI:10.1002/anie.201412319
日期:2015.5.18
N‐heterocyclic carbene ligands enable direct arene alkenylations with easily accessible alkenyl acetates through regioselective CH/CO functionalizations in a stereoconvergent fashion. The versatile cobalt catalyst was broadly applicable and thus also allowed for the efficient conversion of alkenyl phosphates, carbonates, and carbamates at ambient temperature.
便宜的钴催化剂与N-杂环碳烯配体能够通过区域选择性下用容易获得的烯基乙酸酯直接芳烃alkenylations H / C Ò官能化以stereoconvergent方式。通用的钴催化剂具有广泛的用途,因此也可以在环境温度下有效地转化烯基磷酸盐,碳酸盐和氨基甲酸酯。
Triazolylidene Ligands Allow Cobalt-Catalyzed C–H/C–O Alkenylations at Ambient Temperature
Herbert Mayr Abstract Directalkenylation through C–H/C–O cleavage was accomplished under mild reaction conditions by cobalt catalysts derived from novel triazolylidene ligands. The most effective ligand is characterized by sterically demanding substituents on the 1,4-N-atoms of the triazolylidene neighboring the carbene center. The C–Halkenylations proved viable with alkenyl acetates, carbamates,