Synthesis of 4-aryl-5-hydroxy- and 5-aryl-4-hydroxypyridazin-3(2H)-ones and their use in the preparation of 4,5-diarylpyridazin-3(2H)-ones and hitherto unknown isochromeno[3,4-d]pyridazinediones
作者:Bert U.W Maes、Katrien Monsieurs、Kristof T.J Loones、Guy L.F Lemière、Roger Dommisse、Péter Mátyus、Zsuzsanna Riedl、György Hajós
DOI:10.1016/s0040-4020(02)01285-1
日期:2002.11
Easily accessible 2-substituted 4-aryl-5-methoxy- and 2-substituted 5-aryl-4-methoxypyridazin-3(2H)-ones were transformed into the corresponding aryl-hydroxypyridazin-3(2H)-ones by alkaline hydrolysis. The use of these compounds in the synthesis of 2-substituted 4,5-diarylpyridazin-3(2H)-ones with two differently substituted aryl groups was investigated. Two aryl-hydroxypyridazin-3(2H)-ones, 2-(2-benzyl-5-hydroxy-3-oxo-2
通过碱将容易获得的2-取代的4-取代基4-芳基-5-甲氧基和2-取代的5-芳基-4-甲氧基哒嗪-3(2 H)-转化为相应的芳基-羟基哒嗪-3(2 H)-。水解。研究了这些化合物在具有两个不同取代的芳基的2-取代的4,5-二芳基哒嗪-3(2 H)-的合成中的用途。两个芳基-羟基哒嗪-3(2 H)-一,2-(2-苄基-5-羟基-3-氧代-2,3-二氢哒嗪-4-基)苯甲醛和2-(1-苄基-5-羟基-6-氧代-1,6-二氢哒嗪-4-基)苯甲醛被转化为2-苄基-1 H-异色酮[3,4- d ]哒嗪-1,6(2 H)-二酮和3-苄基-3高-用KMnO 4氧化甲酰基,然后进行内酯化,分别制得-isochromeno [3,4- d ] pyridazine-4,6-dione 。