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-1,14,20-trihydroxy-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

Participants

Reaction Conditions

Reaction Steps

A solution of 6 g (7.59 mmole) of 17-ethyl-1,14-dihydroxy-12-[2'-(4"-hydroxy-3"-methoxycyclo-hexyl)-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 (containing approximately 10% of the 17-methyl analog) and 0.87 g (7.8 mmole) selenium dioxide in 60 ml glacial acetic acid and 10 ml water was stirred at 22° C. for 21 hours. The solution was lyophilyzed and the residue was chromatographed on 300 g silica gel using methylene chloride and methanol/methylene chloride as eluent. The new product was rechromatographed on silica gel with 4% methanol/methylene chloride as eluent to yield 1.68 g (27% yield) 17-ethyl-1,14,20-trihydroxy-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.

Provenance & Evidence