Indium-Mediated Allenylation and Propargylation of Allenic Alcohols with Prop-2-ynyl Bromides
作者:Tak Hang Chan、Weishi Miao
DOI:10.1055/s-2003-38062
日期:——
Indium was found to mediate the reaction between aldehydes and 1-bromo-2-butyne to give E-1-substituted-2,5-dimethyl-heptatrien-1-ol compounds in moderate to good yields. The reaction was extended to the regio- and stereoselective allenylation and propargylation of allenic alcohols with different prop-2-ynyl bromides in the presence of indium and indium tribromide under ultrasonic irradiation.
Experimental and Theoretical Studies of the Propargyl-Allenylindium System
作者:Weishi Miao、Lung Wa Chung、Yun-Dong Wu、Tak Hang Chan
DOI:10.1021/ja049241n
日期:2004.10.1
The transient organoindium intermediates formed in the reaction of propargyl bromide with indium in aqueous media and tetrahydrofuran were investigated by NMR spectroscopy and found to be allenylindium(I) and allenylindium(III) dibromide. The influence of solvent and methyl substitution on the propargyl-allenylindium system was also studied. The experimental observations were supported by theoretical calculations using the B3LYP/6-311+G* method.