C(OC([NH:8][C@H:9]1[CH2:14][CH2:13][C@H:12]([C:15]([OH:17])=[O:16])[CH2:11][CH2:10]1)=O)(C)(C)C.[C:18]1([CH2:24]O)[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1.F[B-](F)(F)F.N1(OC(N(C)C)=[N+](C)C)C2C=CC=CC=2N=N1.CCN(CC)CC>CN(C=O)C>[CH2:24]([O:17][C:15]([C@H:12]1[CH2:11][CH2:10][C@H:9]([NH2:8])[CH2:14][CH2:13]1)=[O:16])[C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1A mixture of 2 g (8.2 mmol) trans-4-tert-butoxycarbonylamino-cyclohexanecarboxylic acid (commercially available), 0.978 g (9.0 mmol) phenyl-methanol (commercially available), 3.16 g (9.8 mmol) O-benzotriazol-1-yl-N,N,N′,N′-tetramethyluronium tetrafluoroborate (TBTU) and 1.24 g (12.3 mmol) NEt3 in 10 mL DMF was stirred at room temperature for 1 h. The mixture was evaporated to dryness and extracted with DCM and Na2CO3 aq. The combined organic phases were dried with MgSO4 and evaporated. The residue was treated with 100 mL 4N HCl in dioxane at room temperature for 4 h. The mixture was evaporated to dryness to yield trans-4-amino-cyclohexanecarboxylic acid benzyl ester (MS (m/e): 360.4 (MH+)) which was used without further purification. 150 mL DCM was added, 2.95 g (14 mmol) 4-cyano-benzenesulfonyl chloride (commercially available) and 6.17 g (61 mmol) NEt3 and the mixture was stirred at room temperature for 16 h. The mixture was extracted with DCM and 1N HCl aq. and the combined organic phases were evaporated. The residue was recrystallized from methanol to yield 1.9 g (58%) of the title compound. MS (m/e): 397.0 (MH+).
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