2-Thiophenecarboxylic acid, tetrahydro-3-oxo-, methyl ester → 7-(3-cyclopropyl-2-propyl)-1,2-dihydro9-hydroxy-4-oxo-4H-thieno[2,3-c][1]benzopyran

Participants

Reaction Steps

Following a procedure similar to that described in Example 1B hereinabove, methyl 3-oxo-2,3,4,5-tetrahydrothiophene-2-carboxylate is reacted with 5-(3-cyclopropyl-2-propyl)resorcinol to give 7-(3-cyclopropyl-2-propyl)-1,2-dihydro-9-hydroxy-4-oxo-4H-thieno[2,3-c][1]benzopyran.

Provenance & Evidence