Preparation of Benzo[b]furans Having Five-Membered Heterocycles at the 2-Position and 2-(4-Alkylcarbamoylbuta-1,3-dienyl)benzo[b]furans, and Their Cysteinyl Leukotriene Receptor (cysLT1, cysLT2) Inhibitory Activity

A series of benzo[b]furan derivatives having a five-membered heterocyclic substituent at the 2-position were prepared from 2-(1-chloro-2-formylvinyl)benzo[b]furans (2) and 2-(4-alkylcarbamoylbuta-1,3-dienyl)benzo[b]furans. These 2-heterocyclic benzo[b]furans were evaluated for their cysteinyl leukotriene receptor (cysLT1, cysLT2) inhibitory activity. Several compounds showed moderate inhibition of calcium mobilization in HEK 293T-cysLT2 or CHO-cysLT1 cells.