The carbonyldicobalt-mediated alkyne/allene/CO cocyclization gives 4-alkylidenecyclopentenones as the major [2+2+1] cycloadducts. The regio- and stereoselectivities depend mainly on the substitution pattern of both the alkyne and the allenic moieties, which can be rationalized using the Magnus mechanism. However, contrary to this model, and in agreement with more recent mechanistic studies, our results
AUMANN R.; WEIDENHAUPT H. J., CHEM. BER., 120,(1987) N 1, 23-27
作者:AUMANN R.、 WEIDENHAUPT H. J.
DOI:——
日期:——
Gold-catalyzed reactions of propargylic esters with vinylazides for the synthesis of Z- or E-configured buta-1,3-dien-2-yl esters
作者:Sachin Bhausaheb Wagh、Rai-Shung Liu
DOI:10.1039/c5cc05945c
日期:——
Gold-catalyzed synthesis of buta-1,3-dien-2-yl esters by the reaction of propargyl esters with vinylazides is described; the reaction mechanism is postulated to involve a vinyl attack of vinylazides at alkenyl gold carbenes.