One-Pot Synthesis of 1,3-Disubstituted Allenes from 1-Alkynes, Aldehydes, and Morpholine
作者:Jinqiang Kuang、Shengming Ma
DOI:10.1021/ja910503k
日期:2010.2.17
catalyst for the one-step synthesis of allenesfromterminal alkynes and aldehydes with morpholine as the base in toluene. The reaction is believed to proceed via the intermediacy of propargylic amines, which was converted to allenes by a sequential hydride transfer and beta-elimination process. The reaction is applicable for both aromatic and aliphatic aldehydes. Functionalities such as halide, hydroxyl
The first facile, efficient, atom-economical and regioselective palladium-catalyzed direct C–P cross-coupling of unprotected allenic alcohols with H-phosphonates for the one-pot synthesis of structurally diverse multisubstituted 2-phosphinoyl-1,3-butadienes was developed. This strategy would enrich the allene chemistry and afford new scaffolds to construct complex molecular skeletons.
Mono- and 1,3-disubstituted allenes were synthesized from the corresponding propargylamines via palladium-catalysed hydride-transferreaction. In the current transformation, propargylic amines can be handled as allenyl anion equivalents and introduced into various electrophiles to be transformed into allenes under palladium-catalyzed conditions.