A Cyclization Approach toward Five-Membered Heteroaromatic o-Quinodimethanes via Fused-3-Sulfolenes

Article abstract of DOI:10.1002/jccs.199700045

A general strategy involving the zincation of 4-bromo-3-chloro-2-sulfolene, in situ condensation with an α-heterosubstituted acetaldehyde, and subsequent cyclization reaction as the key steps toward the synthesis of furano- and thieno-3-sulfolenes is desc