反应详情

via a pinacol boronate. A mixture of 2-allyl-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (50 mg, 0.3 mmol), diphenylmethyl (4R, 6R, 7R)-3-formyl-7-phenylacetamidoceph-2-em-4-carboxylate (100 mg, 0.2 mmol), 0.4 nm molecular sieves (50 mg), and toluene (2 ml) was heated under reflux for 3 h and then cooled and purified by chromatography as in part a to give the title compound S-diastereomer, 20 mg (18%), and the R-diastereomer, 23 mg (20%).

1. temperaturewas heated
2. temperatureunder reflux for 3 h
3. temperaturecooled
4. custompurified by chromatography as in part