HCID 15296555, compound → 2-[[5-[[3,4-dihydro-4-oxo-8-(3-phenylpropyl)-2H-1-benzopyran-7-yl]oxy]pentyl]oxy]benzenepropanoic acid methyl ester

Participants

Reaction Steps

Using the procedure of example 11 and starting with 1.13 g (4 mmol) of 2,3-dihydro-7-hydroxy-8-(3-phenylpropyl)-4H-1-benzopyran-4-one (from example 194) and 1.38 g (4 mmol) of 2-[[5-[(methylsulfonyl)oxy]pentyl]oxy]benzenepropanoic acid methyl ester (from example 72), 2-[[5-[[3,4-dihydro-4-oxo-8-(3-phenylpropyl)-2H-1-benzopyran-7-yl]oxy]pentyl]oxy]benzenepropanoic acid methyl ester was obtained in 75.5% yield (1.6 g) as a pale-yellow oil. This diester (3 mmol) was saponified with 13.6 mL of 3N aqueous lithium hydroxide in 80 mL of tetrahydrofuran, at room temperature, for 96 hr. Work-up as in example 4 and recrystallization from ethyl acetate gave 0.6 g (38.5%) of the title acid, a colorless solid, mp 98°-99° C.

Provenance & Evidence