C([Li])CCC.C(NC(C)C)(C)C.Br[CH2:14][CH2:15][N:16]1[CH:20]=[CH:19][C:18]([C:21]([O:23][CH3:24])=[O:22])=[C:17]1[CH2:25][C:26]([O:28][CH3:29])=[O:27].C(NC(C)C)(C)C.[Li]>O1CCCC1.O>[CH:25]1([C:26]([O:28][CH3:29])=[O:27])[CH2:14][CH2:15][N:16]2[CH:20]=[CH:19][C:18]([C:21]([O:23][CH3:24])=[O:22])=[C:17]12
Under nitrogen, n-butyllithium (1.3M in hexane, 75 mL, 98 mmol) was added slowly at -5°-0° C., with stirring, to a solution of di(isopropyl)amine (13.8 mL, 10.0 g, 98 mmol) in tetrahydrofuran (dry, 50 mL). The resulting solution was transferred to an addition funnel and added, under nitrogen at 0°-5° C., to a stirred slurry of methyl N-(2-bromoethyl)-3-methoxycarbonyl-2-pyrroleacetate (20.0 g, 66 mmol) in tetrahydrofuran (dry, 100 mL). There was a slight temperature rise, and complete dissolution occurred after addition of about two-thirds of the lithium di(isopropyl)amine solution. The resulting solution was stirred for 2 hours while warming to 10° C., then diluted with water (100 mL) with slight heat evolution. The solvents were stripped by atmospheric distillation: 240 mL collected, with a pot temperature of 80° C., to afford a solution of dimethyl 2,3-dihydro-1H-pyrrolo[1,2-a]pyrrole-1,7-dicarboxylate. The diester may be isolated at this point by quenching with water, extraction into an organic solvent such as ethyl acetate, and evaporation of the solvent; and purified by conventional methods. However, it is also convenient to saponify the diester to the dicarboxylic acid without isolation from the solution.
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