Coupling of N-Tosylhydrazones with Terminal Alkynes Catalyzed by Copper(I): Synthesis of Trisubstituted Allenes
作者:Qing Xiao、Ying Xia、Huan Li、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201005741
日期:2011.2.1
The easy way to allenes: An operationally simple reaction under mild conditions has led to the direct formation of trisubstituted allenes (see scheme; Ts=4‐toluenesulfonyl). An unprecedented copper–carbene migratory insertion process seems to take place, in contrast to classic copper(I)‐catalyzed reactions of diazo compounds.
Lewis and Brønsted Acid Cocatalyzed Reductive Deoxyallenylation of Propargylic Alcohols with 2-Nitrobenzenesulfonylhydrazide
作者:Zhaohong Liu、Peiqiu Liao、Xihe Bi
DOI:10.1002/chem.201404692
日期:2014.12.22
Reductivedeoxyallenylation of sterically hindered tertiary propargylicalcohols was realized on reaction with 2‐nitrobenzenesulfonylhydrazide (NBSH) by the combined use of Lewis and Brønstedacid catalysts. This method features a broad substrate scope, mild reaction conditions, and good functional‐group tolerance, and affords various mono‐, di‐, and trisubstituted allenes in good‐to‐excellent yields