Imidazole → HCID 86746113, compound

Participants

Reaction Conditions

Reaction Steps

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 (3.25 g, 4.1 mmol) in MeCl2 (17 ml) containing imidazole (2.55 g, 48.7 mmol) was cooled to 0° C. and treated with triisopropylsilyl trifluoromethanesulfonate (7.41 g, 24.2 mmol). The reaction mixture was allowed to warm to RT and stirred for 16 hrs. The reaction mixture was diluted with MeCl2 (20 ml) and n-hexane (40 ml). The resultant suspension was filtered and the filtrate was passed over SiO2. Elution with n-hexane/ethyl acetate (3:1) yielded 17-ethyl-1,14-dihydroxy-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 (3.35 g, 86.3%). Mass Spec: C49H83NO12Si(906.29) FAB:928(M+Na), 756, 678, 511, 266.

Provenance & Evidence