C([N+](CCCC)(CCCC)CCCC)CCC.C(OC([NH:25][C@H:26]1[CH2:29][N:28]([S:30]([O-:33])(=[O:32])=[O:31])[C:27]1=[O:34])=O)(C)(C)C>C(O)=O.C(Cl)Cl>[NH2:25][C@H:26]1[CH2:29][N:28]([S:30]([OH:33])(=[O:32])=[O:31])[C:27]1=[O:34](S)-3-[(t-Butoxycarbonyl)amino]-2-oxo-1-azetidinesulfonic acid, tetra-n-butylammonium salt (3.06 g) is dissolved in 18 ml of 97% formic acid, stirred for 4 hours, diluted with methylene chloride, filtered, washed and dried to give 0.52 g of the title compound; melting point 208°-210° C., dec.; [α]D21 =-39.9[c=2, water].
Wird geladen…