Cornforth reagent → 2-[(3R)-12-[(4-[[(tert-butoxy)carbonyl](ethyl)amino]cyclohexyl)oxy]-7-thia-9,11-diazatricyclo[6.4.0.0[2,6]]dodeca-1(8),2(6),9,11-tetraen-3-yl]acetic acid

Participants

Reaction Steps

A solution of tert-butyl N-ethyl-N-(4-[[(3R)-3-(2-hydroxyethyl)-7-thia-9,11-diazatricyclo[6.4.0.0[2,6]]dodeca-1(8),2(6),9,11-tetraen-12-yl]oxy]cyclohexyl)carbamate (450 mg, 0.97 mmol, 1.00 equiv) and PDC (1791 mg, 4.76 mmol, 4.88 equiv) in 5 mL of DMF was stirred for 14 hrs at 25° C. After completion, the resulting solution was diluted with water and extracted with 3×50 mL of ethyl acetate. The combined organic layers were washed with 3×20 mL of brine, dried over sodium sulfate and concentrated under vacuum. The residue was applied onto a silica gel column with ethyl acetate/petroleum ether (2:1) to give 310 mg (67%) of 2-[(3R)-12-[(4-[[(tert-butoxy)carbonyl](ethyl)amino]cyclohexyl)oxy]-7-thia-9,11-diazatricyclo[6.4.0.0[2,6]]dodeca-1(8),2(6),9,11-tetraen-3-yl]acetic acid as a colorless oil. MS (ES): m/z 476 [M+H]+.

Provenance & Evidence