[C:1]([O:5][C:6]([NH:8][C@@H:9]1[CH2:12][C@H:11]([C:13]([OH:15])=O)[C:10]1([CH3:17])[CH3:16])=[O:7])([CH3:4])([CH3:3])[CH3:2].[CH:18]1[CH:19]=CC2N(O)N=[N:24][C:22]=2[CH:23]=1.N1CCCC1.CCN(CC)CC>C(Cl)Cl>[CH3:16][C:10]1([CH3:17])[C@@H:11]([C:13]([N:24]2[CH2:19][CH2:18][CH2:23][CH2:22]2)=[O:15])[CH2:12][C@H:9]1[NH:8][C:6](=[O:7])[O:5][C:1]([CH3:2])([CH3:3])[CH3:4]
To a stirred solution of (1S,3R)-3-(tert-butoxycarbonylamino)-2,2-dimethylcyclobutanecarboxylic acid (0.700 g, 2.88 mmol) in DCM (20 ml) EDCI (0.660 g, 3.456 mmol) and HOBt (0.529 g, 3.456 mmol) were added at about 0° C. and after 10 minutes, pyrrolidine (0.47 ml, 5.761 mmol) and Et3N (1.42 ml, 14.403 mmol) were added drop wise and the reaction mass was allowed to stir at room temperature for about 12 hours. After completion of the reaction (monitored by TLC), the reaction mixture was diluted with DCM and washed with water and saturated NaHCO3 solution, then washed with aqueous 1N HCl, then water and saturated brine, and the organic layer was concentrated under reduced pressure, the resulting crude residue was stirred in hexane and the resulting solid was obtained which was filtered and dried under vacuum. Wt: 0.400 g; Yield: 46.9%; 1H NMR (300 MHz, CDCl3): δ 5.00 (d, 1H, J=7.5 Hz), 3.89-3.77 (m, 1H), 3.57-3.29 (m, 4H), 2.78-2.68 (m, 1H), 2.31-2.22 (m, 2H), 1.98-1.78 (m, 4H), 1.43 (s, 9H), 1.35 (s, 3H), 0.89 (s, 31-1); Mass: [M+1]+ 297 (40%), [M+Na]+ 319 (100%); 1R (KBr, cm−1): 3312, 2977, 2956, 1709, 1621, 1606, 1526, 1442, 1365, 1348, 1283, 1267, 1176, 1106, 1046, 1009, 912, 877; M.R: 164.8° C.-165.5° C.
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