1,2-dihydro-9-hydroxy-7-methyl-4-oxo-4H-thieno[2,3-c][1]benzopyran → 4,4-di(1-hexyl)-1,2-dihydro-9-hydroxy-7-methyl-4H-thieno[2,3-c][1]benzopyran

Participants

Reaction Steps

By reacting 1,2-dihydro-9-hydroxy-7-methyl-4-oxo-4H-thieno[2,3-c][1]benzopyran with n-hexyl magnesium bromide, using the procedure described in Example 8, there is obtained 4,4-di(1-hexyl)-1,2-dihydro-9-hydroxy-7-methyl-4H-thieno[2,3-c][1]benzopyran. The benzopyran is then reacted with γ-pyrrolidinobutyric acid, hydrobromide salt and dicyclohexylcarbodiimide according to the method of Example 10 to yield the desired ester.

Provenance & Evidence