反应详情

A stirred mixture of lithium acetoacetate (scheme 2: (G)) (1.00 g, 9.26 mmoles), triethylamine (2.58 mL, 18.5 mmoles), and n-propylcyclopropylmethyl amine (scheme 2: (E)) (1.32 mL, 9.26 mmoles) in dry dichloroethane (60 mL) was treated with bis(2-oxo-3-oxazolidinyl)phosphinic chloride (BOPCl) (2.36g, 9.26 mmoles). The mixture was stirred overnight at room temperature, and then acidified (pH˜1) with 1M hydrochloric acid. The mixture was extracted with ethyl acetate, washed with saturated sodium bicarbonate, brine, and dried over MgSO4. Concentration in vacuo and purification by silica gel chromatography (30% ethyl acetate/hexane) gave 900 mg of a yellow oil.

1. extractionThe mixture was extracted with ethyl acetate
2. washwashed with saturated sodium bicarbonate, brine
3. dry with materialdried over MgSO4
4. concentrationConcentration
5. customin vacuo and purification by silica gel chromatography (30% ethyl acetate/hexane)