反应详情

温度

60 °C

A mixture of (1SR,5RS)-1-(3-nitrophenyl)-3-oxabicyclo[3.1.0]hexan-2-one (intermediate B5a) (11.47 g, 52.3 mmol, Eq: 1.00) in ammonia (7 M in MeOH) (140 ml, 980 mmol, Eq: 18.7) was stirred in 10 sealed tubes at 60° C. for 3.5 days, but still not complete (ca. 75% conversion). Evaporated all volatiles, coated on silica gel and the crude material was purified by flash chromatography (silica gel, 200 g, 70% to 100% EtOAc in heptane to EtOH/THF 3:1->2:1) to give recovered (1SR,5RS)-1-(3-nitrophenyl)-3-oxabicyclo[3.1.0]hexan-2-one (1.957 g, 16%, which was converted under the same conditions to product) and (1SR,2RS)-2-(hydroxymethyl)-1-(3-nitrophenyl)cyclopropanecarboxamide (10.61 g, 44.9 mmol, 85.8% yield) as a light brown solid. MS (ISN): m/z=235.1 [(M−H)−].

1. customEvaporated all volatiles
2. customthe crude material was purified by flash chromatography (silica gel, 200 g, 70% to 100% EtOAc in heptane to EtOH/THF 3:1->2:1)
3. customto give
4. customrecovered (1SR,5RS)-1-(3-nitrophenyl)-3-oxabicyclo[3.1.0]hexan-2-one (1.957 g, 16%, which