Original synthesis of 1,2-oxathiolan-2-oxides and vinyl cyclopropane carboxylic esters
1,2-Oxathiolan-2-oxides or vinyl cyclopropane carboxylic esters are prepared chemoselectively and in rather good yields from methyl 2,4-pentadienoate, tributylstannyllithium and carbonyl compounds. The later are formally deoxygenated in the process and play the role of carbenes.