u02dc 2 00 m 4h 2 19 u02dc 2 31 m 1h 2 25 t j 7 hz 2h 3 13 u02dc 3 24 m 1h 3 70 s 3h 5 08 u02dc 5 26 m 3h 7 41 u02dc 7 60 m 3h 7 70 u02dc 7 91 m 2h ir chcl 3 u03bdmax 3390 3280 1730 5 1162 1156 1094 cm anal calcd for c 20 h 27 no 4 s 0 01 c 6 h 6 c 63 68 h 7 21 n 3 70 s 8 48 found c 63 74 h 7 38 n 3 76 s 8 20 ______________________________________ str17 str18 r 39 compd no ______________________________________ ch sub 3 ib a oac ic a br id a cl ie a______________________________________ to a solution of the compound iia 39 caluculated to contain a weight in b ml of dichloromethane are added c ml of triethylamine and d weight of phenylsulfonyl chloride under ice cooling and the mixture is stirred for 0 5 to 1 hour at the same temperature the reaction mixture is partitioned between 2n hydrochloric acid and ethyl acetate the organic layer is washed with 5 sodium hydrogencarbonate and water successively dried over magnesium sulfate and concentrated under reduced pressure the residue is purified.