Fused-Ring Formation by an Intramolecular “Cut-and-Sew” Reaction between Cyclobutanones and Alkynes
作者:Lin Deng、Likun Jin、Guangbin Dong
DOI:10.1002/anie.201712487
日期:2018.3.1
alkynes to construct cyclohexenone‐fused rings is described herein. The challenge arises from the need for selective coupling at the more sterically hindered proximal position, and can be addressed by using an electron‐rich, but less bulky, phosphine ligand. The control experiment and 13C‐labelling study suggest that the reaction may start with cleavage of the less hindered distal C−C bond of cyclobutanones
本文描述了在环丁酮和炔烃之间进行分子内“切割和缝合”催化转化以构建环己烯酮稠合环的过程。挑战来自在空间上受阻较大的近端位置进行选择性偶联的需求,可以通过使用富含电子但体积较小的膦配体来解决。对照实验和13 C标记研究表明,该反应可能始于裂解环丁烯酮受阻较少的远端C-C键,然后脱羰和CO重新插入以使Rh插入受阻较近的位置开始。