[OH:1][C@H:2]([CH2:6][C:7]1[CH:15]=[C:14]([CH3:16])[C:13]2[C:9](=[CH:10][N:11]([CH2:17][O:18][CH2:19][CH2:20][Si:21]([CH3:24])([CH3:23])[CH3:22])[N:12]=2)[CH:8]=1)[C:3]([OH:5])=O.C(N(C(C)C)CC)(C)C.[N:34]1([CH:40]2[CH2:45][CH2:44][NH:43][CH2:42][CH2:41]2)[CH2:39][CH2:38][CH2:37][CH2:36][CH2:35]1.C1CN([P+](ON2N=NC3C=CC=CC2=3)(N2CCCC2)N2CCCC2)CC1.F[P-](F)(F)(F)(F)F>CN(C)C=O.ClCCl>[OH:1][C@H:2]([CH2:6][C:7]1[CH:15]=[C:14]([CH3:16])[C:13]2[C:9](=[CH:10][N:11]([CH2:17][O:18][CH2:19][CH2:20][Si:21]([CH3:23])([CH3:22])[CH3:24])[N:12]=2)[CH:8]=1)[C:3]([N:43]1[CH2:44][CH2:45][CH:40]([N:34]2[CH2:39][CH2:38][CH2:37][CH2:36][CH2:35]2)[CH2:41][CH2:42]1)=[O:5]To a solution of the (R)-2-hydroxy-3-(7-methyl-2-((2-(trimethylsilyl)ethoxy)methyl)-2H-indazol-5-yl)propanoic acid (610 mg, 1.74 mmol), diisopropylethylamine (0.61 mL, 3.48 mmol), and 4-piperidinopiperidine (585.76 mg, 2.0 equiv) in dimethylformamide (20 mL) and dichloromethane (20 mL) at 0° C. was added PyBOP® (951 mg, 1.83 mmol). The reaction was stirred at 0° C. for 2 h. The reaction was concentrated, diluted with ethyl acetate, washed with water, then brine, dried over magnesium sulfate, and concentrated. The product was purified by column chromatography (4:96:1 methanol/dichloromethane/triethylamine) to give 795 mg (91%). Mass spec.: 501.40 (MH)+.
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