Water → HCID 57176789, compound

Participants

Reaction Steps

A solution of 17-ethyl-1,14-dihydroxy-12-[2'-[4"-(2"'-nitrobenzenesulfonyloxy)-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 (105 mg, Example 64, compound A) in dry DMF (1 ml) with sodium azide (22 mg) was heated to 50° C. for 3 h. The reaction mixture was cooled, poured into water and extracted with ethyl acetate. The combined organic layers were washed with brine, dried over sodium sulfate and purified by column chromatography on silica gel (2:1 ethyl acetate/hexane) to gave 32 mg of 17-ethyl-1,14-dihydroxy-12-[2'-(4"-azido-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. This material (30 mg) and triphenylphosphine (15 mg) in 1 ml of wet benzene was refluxed for 6.5 h. The solvent was removed in vacuo and the residue was purified on silica gel (eluted first with 5% MeOH/CH2Cl2, then 1% NH4OH in 5% MeOH/CH2Cl2) to give 12 mg of the title compound.

Provenance & Evidence