C([O:3][C:4]([C:6]1[C:7]2[CH2:8][C@H:9]3[CH2:20][C@H:10]3[C:11]=2[N:12]([C:14]2[CH:19]=[N:18][CH:17]=[CH:16][N:15]=2)[N:13]=1)=[O:5])C.[Li+].[OH-].Cl>O1CCOCC1.O>[N:15]1[CH:16]=[CH:17][N:18]=[CH:19][C:14]=1[N:12]1[C:11]2[C@@H:10]3[CH2:20][C@@H:9]3[CH2:8][C:7]=2[C:6]([C:4]([OH:5])=[O:3])=[N:13]1To a solution of (1aR,5aR)-2-(pyrazin-2-yl)-1a,2,5,5a-tetrahydro-1H-2,3-diaza-cyclopropa[a]pentalene-4-carboxylic acid ethyl ester (150 mg, 0.56 mmol) in dioxane (2 mL) was added 1 N LiOH (1.1 mL, 1.11 mmol). The reaction was stirred for 1 h at 80° C., and cooled to room temperature. The reaction was acidified to pH 2 with 4 N HCl and diluted with H2O to form precipitate. The resulting precipitate was collected by filtration, rinsed with water, and then dried to give the title compound as a white solid (100 mg). LCMS m/z=243.3 [M+H]+; 1H NMR (400 MHz, DMSO-d6) δ ppm 0.43 (td, J=4.5 and 3.4 Hz, 1H), 1.26 (td, J=7.7 and 4.4 Hz, 1H), 2.26-2.33 (m, 1H), 2.70-2.79 (m, 2H), 2.89 (dd, J=16.6 and 6.3 Hz, 1H), 8.60 (dd, J=2.6 and 1.5 Hz, 1H), 8.67 (d, J=2.6 Hz, 1H), 9.17 (d, J=1.4 Hz, 1H), 13.01 (s, 1H).
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