NOVEL PROCESS FOR PRODUCING FUSED IMIDAZOPYRIDINE DERIVATIVE AND NOVEL CRYSTAL FORM

摘要

A process for producing a compound represented by the formula (I) (wherein R is an aromatic heterocycle, etc. and A is a heteroalicyclic group, etc.), characterized by reacting a compound represented by the formula (II) (wherein Hal is halogeno, and R and A have the same meanings as the above) in the presence of a sulfinic acid salt and a salt of an acid or organic base; and a novel crystal of 2-(3-isooxazolyl)-3,6,7,9-tetrahydroimidazo[4,5-d]pyrano[4,3-b]pyridine phosphate monohydrate.