Water → HCID 20136110, compound

Participants

Reaction Conditions

Reaction Steps

31.3 g (0.10 mol) of 8-(4-chloro-2-fluoro-5-methoxyphenyl)-7,9-dioxo-1,8-diazabicyclo[4.3.0]nonane were dissolved in 200 ml of methanol. 5.7 g (0.15 mol) of sodium borohydride were added in portions at a rate such that the temperature was kept at 30°-40° C. When the addition was complete, the mixture was stirred for a further 1 hour at 30° C. and poured into 500 ml of water. The precipitate which deposited was filtered off under suction and dried. 29.8 g (94% of theory) of 8-(4-chloro-2-fluoro-5-methoxyphenyl)-7-hydroxy-9-oxo-1,8-diazabicyclo[4.3.0]nonane were obtained in the form of colorless crystals having the melting point 155°-157° C.

Provenance & Evidence