Alkynyl<i>N</i>-Nosylhydrazones: Easy Decomposition to Alknynl Diazomethanes and Application in Allene Synthesis
作者:Yang Yang、Zhaohong Liu、Alessio Porta、Giuseppe Zanoni、Xihe Bi
DOI:10.1002/chem.201701462
日期:2017.7.6
reaction with boronic acids under metal-free conditions is reported, giving rise to a wide array of di- and trisubstituted allenes. Preliminary mechanistic investigations demonstrated that γ-protodeboration of propargyl boric acid was responsible for the initial allene formation. This methodology based on the nosyl group allows for novel transformations that involve an alkynylcarbene transient species
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