反应详情

A procedure similar to that described in Preparation 4 was repeated, except that 500 mg of 3-methylimidazo[5,4-b]pyridin-2-ylmethanol (prepared as described in Preparation 15), 374 mg of 4-hydroxybenzaldehyde, 0.76 ml of tributylphosphine, 773 mg of 1,1'-(azodicarbonyl)dipiperidine and 12 ml of toluene were used, and that the product was purified by column chromatography through silica gel, using a gradient elution method, with mixtures of ethyl acetate and methanol in ratios ranging from 1:0 to 50:1 by volume as the eluent, to give 0.37 g of the title compound, melting at 124°-125° C.

1. customA procedure similar to that described in Preparation 4
2. customthat the product was purified by column chromatography through silica gel
3. washa gradient elution method