(1R,3aS,5aR,5bR,7aR,11aR,11bR,13aR,13bR)-3a-amino-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)-2,3,3a,4,5,5a,5b,6,7,7a,8,11,11a,11b,12,13,13a,13b-octadecahydro-1H-cyclopenta[a]chrysen-9-yl trifluoromethanesulfonate → ethyl 4-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-3a-amino-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)-2,3,3a,4,5,5a,5b,6,7,7a,8,11,11a,11b,12,13,13a,13b-octadecahydro-1H-cyclopenta[a]chrysen-9-yl)-2-methylcyclohexa-1,3-dienecarboxylate

Participants

Reaction Steps

The title compound was prepared following the method for the preparation of Example 1, Step 1 described above, using (1R,3aS,5aR,5bR,7aR,11aR,11bR,13aR,13bR)-3a-amino-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)-2,3,3a,4,5,5a,5b,6,7,7a,8,11,11a,11b,12,13,13a,13b-octadecahydro-1H-cyclopenta[a]chrysen-9-yl trifluoromethanesulfonate and ethyl 2-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)cyclohexa-1,3-dienecarboxylate as reactants. MS: m/e 557.4 (M−16)+, 2.47 min (method 2). 1H NMR (400 MHz, CHLOROFORM-d) δ 5.65 (s, 1H), 5.28 (d, J=5.8 Hz, 1H), 4.72 (s, 1H), 4.59 (s, 1H), 4.25-4.16 (m, 2H), 2.62-2.48 (m, 1H), 2.48-2.34 (m, 2H), 2.31-2.17 (m, 2H), 2.15 (s, 3H), 2.09-1.97 (m, 2H), 1.80-1.35 (m, 17H), 1.35-1.18 (m, 9H), 1.18-1.04 (m, 6H), 1.02-1.00 (s, 3H), 0.96 (s, 3H), 0.89 (s, 3H).

Provenance & Evidence