反应详情

To a solution of 17-ethyl-1-hydroxy-12-[2'-(3",4"-dihydroxycyclohexyl)-1'-methylvinyl]-23,25-dimethoxy-13,19,21,27-tetramethyl-11,28-dioxa-4-azatricyclo[22.3.1.04,9 ]octacos-18-ene-2,3,10,16-tetraone (150 mg in 3 ml 33% methylene chloride in cyclohexane), sec-butenyl trichloroacetimidate (62 μl neat) is added and the reagents allowed to mix for 5 minutes. Trifluoromethanesulfonic acid (2 μl neat) is then added slowly via syringe and the mixture stirred at room temperature. After 15 minutes the reaction is quenched by the addition of saturated sodiumbicarbonate and extracted with ethyl acetate (3×8 ml). The combined organics are washed with brine and dried over magnesium sulfate. Purification of the concentrate by preparative TLC on silica gel the title compounds.

1. additionto mix for 5 minutes
2. customAfter 15 minutes the reaction is quenched by the addition of saturated sodiumbicarbonate
3. extractionextracted with ethyl acetate (3×8 ml)
4. washThe combined organics are washed with brine
5. dry with materialdried over magnesium sulfate
6. customPurification of the
7. concentrationconcentrate by preparative TLC on silica gel the title compounds