Acetonitrile → 4-[[(3aS,5aR,5bR,7aR,9S,11aR,11bR,13aS)-3a-[(E)-3-[[1-(4-chlorophenyl)cyclopropyl]amino]-3-oxo-prop-1-enyl]-1-isopropyl-5a,5b,8,8,11a-pentamethyl-2-oxo-4,5,6,7,7a,9,10,11,11b,12,13,13a-dodecahydro-3H-cyclopenta[a]chrysen-9-yl]oxy]-2,2-dimethyl-4-oxo-butanoic acid

Participants

Reaction Steps

To a solution of 1-tert-butyl 4-((3aS,5aR,5bR,7aR,9S,11aR,11bR,13aS)-3a-((E)-3-((1-(4-chlorophenyl)cyclopropyl)amino)-3-oxoprop-1-en-1-yl)-1-isopropyl-5a,5b,8,8,11a-pentamethyl-2-oxo-3,3a,4,5,5a,5b,6,7,7a,8,9,10,11,11a,11b,12,13,13a-octadecahydro-2H-cyclopenta[a]chrysen-9-yl) 2,2-dimethylsuccinate (460 mg, 0.554 mmol) in Dichloromethane (6 mL) was added TFA (3 mL, 0.554 mmol). The reaction mixture was stirred at r.t for 2 hs and evaporated in vacuo to afford crude product, which was purified by preparative-HPLC (Mobile Phase: A=0.05% TFA/H2O, B=MeCN) to give the product 4-(((3aS,5aR,5bR,7aR,9S,11aR,11bR,13aS)-3a-((E)-3-((1-(4-chlorophenyl)cyclopropyl)amino)-3-oxoprop-1-en-1-yl)-1-isopropyl-5a,5b,8,8,11a-pentamethyl-2-oxo-3,3a,4,5,5a,5b,6,7,7a,8,9,10,11,11a,11b,12,13,13a-octadecahydro-2H-cyclopenta[a]chrysen-9-yl)oxy)-2,2-dimethyl-4-oxobutanoic acid (130 mg, 0.162 mmol, 29.2%) as a white solid. 1H NMR (400 MHz, CDCl3) δ ppm 9.00 (m, 1H), 7.31 (d, J=8.8 Hz, 2H), 7.15 (d, J=15.6 Hz, 1H), 7.06 (d, J=8.8 Hz, 2H), 5.99 (d, J=15.6 Hz, 1H), 4.56 (m, 1H), 3.11 (m, 1H), 2.89-0.80 (m, 54H); LC/MS: m/z calculated 773.4. Found 774.3 (M+1)+.

Provenance & Evidence