反应详情

A procedure similar to that described in Preparation 4 was repeated, except that 1.50 g of 3,7-dimethyl-2-hydroxymethylimidazo[5,4-b]pyridine (prepared as described in Preparation 40), 3.94 g of 5-(4-hydroxybenzyl)-3-triphenylmethylthiazolidine-2,4-dione, 2.11 ml of tributylphosphine, 2.14 g of 1,1'-(azodicarbonyl)dipiperidine and 30 ml of toluene were used, to give the title compound as a crude product. This crude product was purified by column chromatography through silica gel, using a gradient elution method, with mixtures of hexane and ethyl acetate in ratios ranging from 1:1 to 1:2 by volume as the eluent, to give 1.11 g of the title compound, melting at 92°-105° C. (softening).

1. customA procedure similar to that described in Preparation 4