[Br:1][C:2]1[CH:18]=[CH:17][C:5]([C:6]([C@@H:8]2[CH2:13][CH2:12][CH2:11][CH2:10][C@H:9]2[C:14]([OH:16])=[O:15])=[O:7])=[CH:4][CH:3]=1.[CH3:19][Si:20]([CH3:25])([CH3:24])[CH2:21][CH2:22]O.CCN=C=NCCCN(C)C.O>C(Cl)Cl>[Br:1][C:2]1[CH:3]=[CH:4][C:5]([C:6]([C@@H:8]2[CH2:13][CH2:12][CH2:11][CH2:10][C@H:9]2[C:14]([O:16][CH2:22][CH2:21][Si:20]([CH3:25])([CH3:24])[CH3:19])=[O:15])=[O:7])=[CH:17][CH:18]=1
To a solution of trans-2-(4-bromobenzoyl)cyclohexanecarboxylic acid (5.0 g, 16.07 mmol) in DCM (80 mL) was added 2-(trimethylsilyl)ethanol (2.1 g, 17.68 mmol), N,N′-dimethylamino-pyridine (98 mg, 0.80 mmol), and EDCI (4.0 g, 20.89 mmol). The resulting reaction mixture was stirred at rt for 2 days. Water was added, and the mixture was diluted with DCM. The aqueous layer was separated and extracted with DCM. The combined organic phases were washed with water and brine, dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure. Silica gel chromatography (Biotage cartridge), eluting with 10% EtOAc in hexane gave trans-(trimethylsilyl)ethyl 2-(4-bromobenzoyl)cyclohexanecarboxylate (2.44 g, 37%). 1H NMR (400 MHz, CD2Cl2) δ −0.01 (s, 9H), 0.85 (m, 2H), 1.45 (m, 3H), 1.73 (m, 2H), 1.90 (m, 2H), 2.18 (m, 1H), 2.71 (m, 1H), 3.80 (m, 1H), 4.05 (m, 2H), 7.58 (d, 2H), 7.70 (d, 2H).
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