2,3-dihydro-7-hydroxy-8-propyl-4H-1-benzopyran-4-one → HCID 54210556, compound

Participants

Reaction Steps

Using the procedure of example 11 and starting with 0.28 g (1.4 mmol) of 2,3-dihydro-7-hydroxy-8-propyl-4H-1-benzopyran-4-one and 0.48 g (1.4 mmol) of 3-[[5-[(methylsulfonyl)oxy]pentyl]oxy]benzenepropanoic acid methyl ester (from example 67), 3-[5-[(3,4-dihydro-4-oxo-8-propyl-2H-1-benzopyran-7-yl)oxy]pentyloxy]benzenepropanoic acid methyl ester was obtained in 57% yield (0.36 g) as a yellow oil. This diester (0.79 mmol) was saponified with 2 mL of 3N aqueous lithium hydroxide in 20 mL of tetrahydrofuran, at room temperature, for 22 hr. Work-up as in example 4 gave crystalline 3-[5-[(3,4-dihydro-4-oxo-8-propyl-2H-1-benzopyran-7-yl)oxy]pentyloxy]benzenepropanoic acid. Recrystallization from ethyl acetate-hexane gave 0.30 g (86%) of a colorless solid, mp 124°-125° C.

Provenance & Evidence