反应详情

A suspension of 33B (151 mg, 0.38 mmol) and pivalaldehyde (100 μl, 0.90 mmol) in a mixture of dry benzene (0.5 ml) and dry pentane (5.0 ml) was refluxed for 25 hr with a Dean-Starke receiver (Ref: Org. Lett., 2 (18) 2781-2783, (2000)). The reaction mixture was evaporated to dryness and dried in vacuo. Purification using automated flash chromatography (35 g silica gel column, EtOAc/hexane gradient) gave the title compound as a light pink-colored solid (144.1 mg, 86.3%). m.p. 155-157° C. MS (ES): m/z 440 [M+1]+.

1. customThe reaction mixture was evaporated to dryness
2. customdried in vacuo
3. customPurification