Stereoselective reactions of lithio-vinylsulf oxides with aldehydes
作者:John Fawcett、Stuart House、Paul R. Jenkins、Nicholas J. Lawrence、David R. Russell
DOI:10.1039/p19930000067
日期:——
LDA and allowed to react with acetaldehyde, isobutyraldehyde, and trimethylacetaldehyde to give β-hydroxy sulfoxides with moderate diastereoselectivity. The sulfoxide 1 gave the best selectivity with the larger aldehyde. The same diastereoselectivity, within experimental error, is observed in the reactions with trimethylacetaldehyde of both E-1 and Z-1 giving 85:15 and 84:16 mixtures of 2c and 3c respectively;
The palladium catalyzed [3+2] cycloaddition of trimethylenemethane with a variety of vinylsulfoxides led to cycloadducts in good to excellent chemical yields and with a good level of asymmetricinduction.