Sodium borohydride → 7-Fluorochroman-4-ol

To a stirred solution of 5.0 grams (0.03 mole) of 3,4-dihydro-7-fluoro-2H-1-benzopyran-4-one in 100 mL of methanol was added portionwise 3.4 grams (0.09 mole) of sodium borohydride during a one hour period, after which the reaction mixture was stirred for about 18 hours. The reaction mixture was then concentrated under reduced pressure to a residue, which was slurried in water and extracted with methylene chloride. The extract was dried with magnesium sulfate and filtered. The filtrate was concentrated under reduced pressure to a residue, which was subjected to column chromatography on silica gel, with 1:4 ethyl acetate:hexane as the eluant. The product-containing fractions were combined and concentrated under reduce pressure, yielding 4.4 grams of 3,4-dihydro-7-fluoro-4-hydroxy-2H-1-benzopyran. The NMR spectrum was consistent with the proposed structure. This reaction was repeated several times.

1. concentrationThe reaction mixture was then concentrated under reduced pressure to a residue, which
2. extractionextracted with methylene chloride
3. dry with materialThe extract was dried with magnesium sulfate
4. filtrationfiltered
5. concentrationThe filtrate was concentrated under reduced pressure to a residue, which
6. concentrationconcentrated

ORD record

ord-719a4dbe8bef4b2985bae2d722225c32

Source dataset

uspto-grants-1996_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05521147