反应详情

EXAMPLE 104 was prepared from 3-nitro-N6-[1-(2-phenyl-ethanesulfonyl)-piperidin-4-ylmethyl]-pyridine-2,6-diamine (EXAMPLE 103) (1 mmol scale) by hydrogenation in 15 mL of THF/methanol over 0.5 of Raney-nickel under 1 atm of hydrogen for 1 h, followed by immediate conversion of the crude, air sensitive triaminopyridine into the imidazo[4,5b]pyridine by heating with 5 mL of 96% formic acid and 2 mL of 37% hydrochloric acid at reflux overnight. The free base was liberated with sodium hydroxide and purified by preparative chromatography, eluting with 90:10 chloroform: methanol: MS (m+1)=400.5.

1. temperatureat reflux overnight
2. custompurified by preparative chromatography
3. washeluting with 90:10 chloroform