Ya. Jackson et Mf. Williams, HETEROCYCLES FROM 2-AMINOPYRIDINE AND DERIVATIVES OF 3-METHYLBENZOFURAN-2-CARBOXYLIC ACID, Heterocycles, 45(4), 1997, pp. 787-794
-Bromomethyl-2-carboethoxy-5,6-dimethoxybenzofuran (3b) reacted with 2
-aminopyridine to give not only the expected ,6-dimethoxy-3-benzofuran
methyl-2'-aminopyridinium bromide (4 b), but also 5,6-dimethoxy-3-benz
ofuranmethyl)-N-2-pyridylamine (5). Synthesis of oxy-6,7,12-trihydro-6
-oxo-[1]benzofurano-[2,3-c]-1 H-pyrido[1,2-a][1,3]diazepinium bromide
(1 2) is also described.