1h d j 8 5 hz h 7 6 31 1h s h 3 2 40 3h s ch 3 anal calcd for c 16 h 13 no c 81 68 h 5 57 n 5 95 found c 81 60 h 5 63 n 5 88 i 8 a 700 mg 3 mmole was dissolved in dry dmf 30 ml and nah 360 mg 15 mmole was added protionwise with stirring for 30 min at room temperature benzyl chloride 750 mg 6 mmole was then added dropwise and stirred at room temperature overnight the reaction mixture was poured into ice water and extracted with ch 2 cl 2 the organic layer was washed with water dried over mgso 4 and evaporated the residue was further chromatographed over silica gel by elution with n hexane etoac 3 1 and recrystallized from n hexane ch 2 cl 2 to afford i 8 b as white crystal 536 mg 54 9 1 h nmr dmso d6 200 mhz u03b4 8 23 8 26 2h m h 2 u2032 h 6 u2032 7 88 7 91 2h m h 5 h 8 7 37 7 62 9h m h 7 h 3 u2032 h 4 u2032 h 5 u2032 ph 5 51 2h s och 2 ph 2 48 3h s ch 3 anal calcd for c 23 h 19 no c 84 89 h 5 89 n.