A Cyclization Approach toward Five-Membered Heteroaromatico-QuinodimethanesviaFused-3-Sulfolenes
摘要:
AbstractA 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 described. These fused‐3‐sulfolenes are demonstrated to be good precursors for the corresponding o‐quinodimethanes.