[N:1]1[CH:6]=[CH:5][N:4]=[CH:3][C:2]=1[N:7]1[C:14]2[C@@H:13]3[CH2:15][C@@H:12]3[CH2:11][C:10]=2[C:9]([C:16]([OH:18])=O)=[N:8]1.CN(C(ON1N=NC2C=CC=NC1=2)=[N+](C)C)C.F[P-](F)(F)(F)(F)F.C(N(CC)CC)C.[Cl-].[C:51]([NH:55][NH3+:56])([CH3:54])([CH3:53])[CH3:52]>C(#N)C>[C:51]([NH:55][NH:56][C:16]([C:9]1[C:10]2[CH2:11][C@H:12]3[CH2:15][C@H:13]3[C:14]=2[N:7]([C:2]2[CH:3]=[N:4][CH:5]=[CH:6][N:1]=2)[N:8]=1)=[O:18])([CH3:54])([CH3:53])[CH3:52]To a suspension of (1aR,5aR)-2-(pyrazin-2-yl)-1a,2,5,5a-tetrahydro-1H-2,3-diaza-cyclopropa[a]pentalene-4-carboxylic acid (1.211 g, 5.0 mmol) and HATU (2.091 g, 5.50 mmol) in acetonitrile (100 mL) was added triethylamine (1.771 g, 17.50 mmol) at room temperature. 2-tert-Butylhydrazinium chloride (0.748 g, 6.00 mmol) was added to the solution and the reaction was stirred for 12 at room temperature. The mixture was concentrated. The residue was diluted with EtOAc (150 mL) and washed with NaHCO3 solution (100 mL). The organic layer was concentrated and purified by silica gel column chromatography to give the title compound (1.42 g) as a glassy solid. LCMS m/z=313.3 [M+H]+; 1H NMR (400 MHz, CDCl3) δ ppm 0.49 (dd, J=8.0 and 4.7 Hz, 1H), 1.18 (s, 9H), 1.24-1.29 (m, 1H), 2.29-2.34 (m, 1H), 2.75-2.80 (m, 1H), 2.94 (d, J=16.9 Hz, 1H), 3.03 (dd, J=16.5 and 6.2 Hz, 1H), 4.75 (bs, NH, 1H), 805 (bs, NH, 1H), 8.41 (dd, J=2.5 and 1.5 Hz, 1H), 8.51 (d, J=2.6 Hz, 1H), 9.26 (d, J=1.4 Hz, 1H).
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