Trifluoromethanesulfonic acid → HCID 57154952, compound

Participants

Reaction Steps

To a solution of 17-ethyl-1-hydroxy-12-[2'-(4"(tert-butyldimethylsiloxy)-3"-hydroxycyclohexyl)-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 (186 mg in 6 ml 33% methylene chloride in cyclohexane) allyltrichloroacetimidate (62 μl neat) was added and the reagents allowed to mix for 5 minutes. Trifluoromethanesulfonic acid (5 μl neat) was added slowly via syringe and the mixture stirred at room temperature. After 24 hours the reaction was quenched by the addition of saturated sodium bicarbonate and extracted with ethyl acetate (3×5 ml). The combined organics were washed with brine and dried over magnesium sulfate. Purification of the concentrate by flash chromatography on silica gel (ethyl acetate: hexane (1:4)+1% methanol) gave the title compound (80 mg).

Provenance & Evidence