HCID 15595179, compound → HCID 15595180, compound

Participants

Reaction Steps

A solution of 2.3 g of the chromanone product from Example 2 in 25 ml of methanol and 5 ml of 2N hydrochloric acid was stirred for 1.75 hours at room temperature then concentrated in vacuo to remove most of the methanol. The residue was diluted with water, neutralized with sodium bicarbonate, and extracted 4 times with ether. The combined ether extracts were washed with water and brine, dried (magnesium sulfate), filtered, and concentrated in vacuo in yield 1.85 g of an oil. This material was purified by HPLC (silica gel, 1.5:1 ethyl acetate-hexane) giving 1.65 g (87.1%) of rac.-[[3,4-dihydro-2-(6-hydroxyhexyl)-2-methyl-4-oxo-8-propyl-2H-1-benzopyran-7-yl]oxy]acetic acid methyl ester as a yellow oil.

Provenance & Evidence