CS(O[C@@H:6]1[CH2:10][CH2:9][N:8]([C:11]([O:13][CH2:14][C:15]2[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=2)=[O:12])[CH2:7]1)(=O)=O.[N-:21]=[N+:22]=[N-:23].[Na+]>CN(C)C=O>[N:21]([C@H:6]1[CH2:10][CH2:9][N:8]([C:11]([O:13][CH2:14][C:15]2[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=2)=[O:12])[CH2:7]1)=[N+:22]=[N-:23]A solution of 20.5 g (72 mmol) of (R)-3-[(methylsulfonyl)oxy]-1-pyrrolidinecarboxylic acid, phenylmethyl ester in 100 ml of dry N,N-dimethylformamide was treated with 6.5 g (0.1 mol) of sodium azide and heated at 90° for four hours. The solvent was removed in high vacuo at 50° and the residue was partitioned between ethyl acetate/water (250 ml each). The aqueous layer was reextracted with ethyl acetate and the combined organic fractions were washed with water, dried (MgSO4) and evaporated in vacuo to give 16.2 g of the title compound.
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