Reaction SMILES: [CH3:1][C@:2]12[C@@:19]3([CH3:20])[C@@H:10]([C@:11]4([CH3:31])[C@@H:16]([CH2:17][CH2:18]3)[C:15]([CH3:22])([CH3:21])[C:14](OS(C(F)(F)F)(=O)=O)=[CH:13][CH2:12]4)[CH2:9][CH2:8][C@@H:7]1[C@H:6]1[C@H:32]([C:35]([CH3:37])=[CH2:36])[CH2:33][CH2:34][C@:5]1([C:38]([O:40][CH2:41][C:42]1[CH:47]=[CH:46][CH:45]=[CH:44][CH:43]=1)=[O:39])[CH2:4][CH2:3]2.[C:48]1(B(O)O)[CH:53]=[CH:52][C:51]([B:54]([OH:56])[OH:55])=[CH:50][CH:49]=1.C(=O)([O-])[O-].[Na+].[Na+]>C1COCC1.O.CCOC(C)=O.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH2:41]([O:40][C:38]([C@:5]12[CH2:34][CH2:33][C@@H:32]([C:35]([CH3:37])=[CH2:36])[C@@H:6]1[C@@H:7]1[C@@:2]([CH3:1])([CH2:3][CH2:4]2)[C@@:19]2([CH3:20])[C@@H:10]([C@:11]3([CH3:31])[C@@H:16]([CH2:17][CH2:18]2)[C:15]([CH3:21])([CH3:22])[C:14]([C:48]2[CH:49]=[CH:50][C:51]([B:54]([OH:56])[OH:55])=[CH:52][CH:53]=2)=[CH:13][CH2:12]3)[CH2:9][CH2:8]1)=[O:39])[C:42]1[CH:47]=[CH:46][CH:45]=[CH:44][CH:43]=1
Reactant: C=C(C)[C@@H]1CC[C@]2(C(=O)OCc3ccccc3)CC[C@]3(C)[C@H](CC[C@@H]4[C@@]5(C)CC=C(OS(=O)(=O)C(F)(F)F)C(C)(C)[C@@H]5CC[C@]43C)[C@@H]12
Reactant: OB(O)c1ccc(B(O)O)cc1
Agent: c1ccc([P](c2ccccc2)(c2ccccc2)[Pd]([P](c2ccccc2)(c2ccccc2)c2ccccc2)([P](c2ccccc2)(c2ccccc2)c2ccccc2)[P](c2ccccc2)(c2ccccc2)c2ccccc2)cc1
Agent: O=C([O-])[O-]
Agent: [Na+]
Solvent: C1CCOC1
Solvent: O
Solvent: CCOC(C)=O
Product: C=C(C)[C@@H]1CC[C@]2(C(=O)OCc3ccccc3)CC[C@]3(C)[C@H](CC[C@@H]4[C@@]5(C)CC=C(c6ccc(B(O)O)cc6)C(C)(C)[C@@H]5CC[C@]43C)[C@@H]12
Temperature: 90 °C
Reaction time: 6 h
Yield: 34.2 %

Procedure:
To a solution of (1R,3aS,5aR,5bR,7aR,11aR,11bR,13aR,13bR)-benzyl 5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)-9-(((trifluoromethyl)sulfonyl)oxy)-2,3,3a,4,5,5a,5b,6,7,7a,8,11,11a,11b,12,13,13a,13b-octadecahydro-1H-cyclopenta[a]chrysene-3a-carboxylate (3.0 g, 4.43 mmol) in THF (100 mL) was added 1,4-benzenediboronic acid (1.469 g, 8.86 mmol) and tetrakis(triphenylphosphine)palladium(0) (0.259 g, 0.222 mmol). The resulting yellow mixture was purged with N2. Then, a solution of sodium carbonate (2.82 g, 26.6 mmol) in H2O (25.00 mL) was added and the reaction mixture was heated to reflux at 90° C. After 6 h, the reaction mixture was cooled to rt, diluted with EtOAc (50 mL) and washed with H2O (50 mL). The aqueous layer was extracted with EtOAc (2×50 mL). The combined organic layer was filtered through celite pad, washed with brine, dried over MgSO4, filtered and concentrated to afford a light brown solid. The crude material was absorbed onto silica gel (20 g), loaded onto a silica gel column and eluted with 3:1 hexanes:EtOAc to give (4-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-3a-((benzyloxy)carbonyl)-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)phenyl)boronic acid (983 mg, 34.2%) as a white solid. 1H NMR (500 MHz, CHLOROFORM-d) δ 8.18-8.14 (m, 2H), 7.43-7.38 (m, 4H), 7.38-7.35 (m, 1H), 7.31-7.29 (m, 1H), 5.37-5.34 (m, 1H), 5.17 (t, J=1.0 Hz, 2H), 4.77 (d, J=1.5 Hz, 1H), 4.64 (s, 1H), 3.08 (td, J=10.8, 4.7 Hz, 1H), 2.35-2.30 (m, 1H), 2.30-2.25 (m, 1H), 2.15 (dd, J=17.1, 6.1 Hz, 1H), 1.98-1.89 (m, 2H), 1.73 (s, 3H), 1.69 (d, J=3.7 Hz, 1H), 1.67-1.64 (m, 1H), 1.56-1.37 (m, 10H), 1.37-1.23 (m, 3H), 1.19 (d, J=13.1 Hz, 1H), 1.07 (dd, J=13.1, 4.3 Hz, 1H), 1.02 (s, 6H), 0.99 (br. s., 3H), 0.99 (br. s., 3H), 0.96-0.93 (m, 1H), 0.87 (s, 3H). 13C NMR (126 MHz, CHLOROFORM-d) δ 175.8, 150.6, 148.41-148.39 (m, 1C), 148.3, 146.8, 136.5, 134.6, 129.7, 128.5, 128.2, 128.1, 123.7, 109.6, 65.7, 56.6, 52.9, 49.6, 49.4, 46.9, 42.4, 41.8, 40.5, 38.4, 37.5, 37.0, 36.3, 33.6, 32.1, 30.6, 29.6, 29.5, 25.7, 21.3, 21.1, 19.8, 19.4, 16.5, 15.6, 14.7.