Trifluoromethanesulfonic acid → 17-Ethyl-1-hydroxy-12-[2'-(4"-allyloxy-3"-methoxy-cyclohexyl)-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

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Reaction Steps

To a solution of 17-ethyl-1-hydroxy-12-[2'-(4"-hydroxy-3"-methoxycyclohexyl)-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 (510 mg) in 6.6 ml 33% methylene chloride in cyclohexane, was added allyl trichloroacetimidate (266 mg neat) and the reaction mixture was allowed to mix for 5 minutes. Trifluoromethanesulfonic acid (12 μl neat) was added slowly via syringe and the mixture stirred at room temperature. After 24 hours the reaction mixture was diluted with ethyl acetate and washed with saturated sodium carbonate, water and brine. The organic layer was dried over magnesium sulfate. Purification of the concentrate by flash chromatography on silica gel (ethyl acetate: hexane (1:9))+1% methanol) gave the title compound (434 mg). 1H NMR consistent with the desired structure.

Provenance & Evidence