pressure to provide a residue which was dissolved in methanol concentrated and further treated with toluene and dried to obtain vi a 7 which was used for further reaction aqueous acetic acid 50 was gradually added to the stirred mixture of compound vi a 7 280 2 g in ethyl acetate 2800 ml and water 1680 ml till the ph of the reaction mass was between 6 5 and 7 5 reaction mass was stirred at room temperature till completion of the reaction as monitored by tlc the reaction mass was filtered and the obtained solid was dried to give compound i a 7 1 h nmr 400 mhz dmso d 6 u03b4 12 99 br s 2h d 2 o exchangable 7 91 d j 7 6 hz 2h 7 51 6 87 m 6h 6 32 d j 7 6 hz 2h 4 13 s 4h 3 79 s 6h 3 76 s 6h 1r u2212 10 camphorsulfonyl oxaziridine 157 1 gms was gradually added to a mixture of v a 8 200 5 g and sodium hydroxide 54 3 g in isopropyl alcohol 1400 ml under stirring at room temperature the reaction mixture was stirred at the same temperature till completion of the reaction as monitored by tlc and filtered the filtrate was concentrated under reduced pressure to provide a residue which was dissolved in methanol concentrated and further treated with toluene and dried to obtain vi a 8 which was used for further reaction aqueous acetic acid 50 was gradually added to the stirred mixture of vi a 8 200 2 g in ethyl acetate 2000 ml and water 1200 ml till the ph of the reaction mass was.