(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 → methyl 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)cyclohexa-1,3-dienecarboxylate

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Reaction Steps

The title compound was prepared following the method described in step 1 for the preparation of Example 1, 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 methyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)cyclohexa-1,3-dienecarboxylate as the reactants. (60.8% yield). MS: m/e 529.5 (M−16)+, 2.816 min (method 8). 1H NMR (400 MHz, CHLOROFORM-d) δ 6.99 (d, J=5.8 Hz, 1H), 5.78 (d, J=5.8 Hz, 1H), 5.27 (dd, J=6.0, 1.8 Hz, 1H), 4.70 (d, J=2.0 Hz, 1H), 4.57 (d, J=1.3 Hz, 1H), 3.72 (s, 3H), 2.52 (td, J=10.8, 5.3 Hz, 1H), 2.48-2.39 (m, 1H), 2.36-2.29 (m, 1H), 2.09-1.95 (m, 2H), 1.76-1.20 (m, 22H), 1.66 (s, 3H), 1.05 (s, 3H), 0.98 (s, 3H), 0.94 (s, 6H), 0.86 (s, 3H).

Provenance & Evidence