17-Ethyl-1,14-dihydroxy-12-[1-(4-hydroxy-3-methoxycyclohexyl)prop-1-en-2-yl]-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-tetrone → 17-Ethyl-1-hydroxy-12-[2'-(4"-triisopropylsilyloxy-3"-methoxycyclohexyl)-1'-methylvinyl]-14-triisopropylsilyloxy-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

関与物質

反応条件

反応手順

A stirred solution of 17-ethyl-1,14-dihydroxy-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 (7.0 g, 8.84 mmol) containing 2,6 lutidine (3.7 g, 34.6 mmol) was cooled to 0° C. and treated with triisopropylsilyl trifluoromethanesulfonate (11.06 g, 36.0 mmol). After stirring at RT for 16 hr, the reaction mixture was diluted with n-hexane (400 ml). The suspension was filtered and the filtrate passed over SiO2 (760 g). Elution with n-hexane/ethyl acetate (3:1) yielded 17-ethyl-1-hydroxy-14-triisopropylsilyloxy-12-[2'-(4"-triisopropylsilyloxy-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 (9.18 g, 94%) as a foam. Mass Spec (C61H109NO12Si2)(1104.72) FAB+Li:1110 (M+Li), 745, 720, 695, 266.

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