30 u00b0 c a slurry of 2 1 g of lioh h 2 o in 39 ml of h 2 o was added the solution was heated to 40 u00b0 c and stirred for 2 hours after cooling the solution to 20 30 u00b0 c the aqueous solution was extracted with 15 ml of t butyl methyl ether u201c tbme u201d the separated aqueous layer was then added to 23 ml of concentrated hcl after cooling the slurry to 0 u00b0 c for 1 hour the solid was filtered and dried under vacuum at 60 u00b0 c to give the desired compound of formula vii 5 g in 89 yield over two steps 1 h nmr dmso 400 mhz u03b4 8 22 d j 6 6 hz 1h 8 00 d j 6 6 hz 1h 2 32 s 3h 2 25 s 3h to an agitated solution of 32 5 g of potassium carbonate in 163l of water at 45 55 u00b0 c was added a slurry of 32 4 g of the compound of formula vi in 163 ml of thf after addition the mixture was agitated at 45 55 u00b0 c for 30 minutes after separation the organic layer was washed.