1,1,2‐Trifunctionalization of Terminal Alkynes by Radical Addition–Translocation–Cyclization–Trapping for the Construction of Highly Substituted Cyclopentanes
作者:Youqing Yang、Constantin G. Daniliuc、Armido Studer
DOI:10.1002/anie.202011785
日期:2021.1.25
Radical 1,1,2‐trifunctionalization of terminal alkynes by an addition–translocation–cyclization–trapping sequence using readily available alkynyl triflones as trifluoromethyl radical precursors and trapping reagents is reported. Cascades occur by addition of the trifluoromethyl radical to a terminal alkyne, 1,5‐hydrogen atom transfer, 5‐exo‐cyclization, and subsequent alkynylation to provide (1‐tr
据报道,使用易于获得的炔基三氟酮作为三氟甲基自由基前体和捕集试剂,通过加成-易位-环化-捕集顺序使末端炔烃具有自由基1,2,3-三官能团。级联反应是通过将三氟甲基基团加到末端炔烃上,进行1,5-氢原子转移,5-外-环化以及随后的炔基化反应来提供的(1-三氟甲基)炔丙基环戊烷。在高温下,以市售过氧化二苯甲酰或α,α'-偶氮二异丁腈为引发剂进行反应,并以高收率提供高度取代的环戊烷。