Réaction #2383802

Équation de réaction

sodium hydroxide

7-nitro-2,3,4,5-tetrahydro-1,4-benzoxazepine hydrochloride

formaldehyde

formic acid

→

solid

Rendement 61.5%

4-Methyl-7-nitro-2,3,4,5-tetrahydro-1,4-benzoxazepine hydrochloride

Rendement 61.5%

Solvants

water

Conditions de réaction

Traitement

1. 1
   Températurecooled

Mode opératoire

A mixture of 7-nitro-2,3,4,5-tetrahydro-1,4-benzoxazepine hydrochloride (11.53 g, 50 mmol), 37% formaldehyde (25 ml, 335 mmol) and 88% formic acid (15 ml, 340 mmol) was heated at 80° C. for 24 h, cooled and poured into water (150 ml). The suspension was Is basified with 25% aqueous sodium hydroxide to give a brown solid (7.52 g). The aqueous layer was extracted with methylene chloride (3×200 ml), washed with saturated brine solution, and dried over magnesium sulphate to give yellow crystals (1.02 g). This sample was combined with the solid obtained earlier and suspended in isopropanol (750 ml), refluxed for several hours and then filtered. The filtrate was acidified to give the title compound (9.51 g).

Source