Ammonium → 1-(tert-Butyl) 2-methyl 4-methylenepyrrolidine-1,2-dicarboxylate

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[Br-:26].[CH3:1][C:2]([CH3:3])([O-:4])[CH3:5].[CH3:27][P+:28]([c:29]1[cH:30][cH:31][cH:32][cH:33][cH:34]1)([c:35]1[cH:36][cH:37][cH:38][cH:39][cH:40]1)[c:41]1[cH:42][cH:43][cH:44][cH:45][cH:46]1.[CH3:47][CH2:48][O:49][CH2:50][CH3:51].[Cl-:24].[K+:6].[NH4+:25].[O:7]=[C:8]1[CH2:9][CH:10]([C:20](=[O:21])[O:22][CH3:23])[N:11]([C:13](=[O:14])[O:15][C:16]([CH3:17])([CH3:18])[CH3:19])[CH2:12]1>>[CH2:1]=[C:8]1[CH2:9][CH:10]([C:20](=[O:21])[O:22][CH3:23])[N:11]([C:13](=[O:14])[O:15][C:16]([CH3:17])([CH3:18])[CH3:19])[CH2:12]1