Synthesis of 4-alkylsulfanylphthalazin-1(2H)-ones via palladium catalyzed sulfanylation of substituted 4-bromophthalazin-1(2H)-ones
作者:Zbigniew Malinowski、Emilia Fornal、Beata Sierocińska、Renata Czeczko、Monika Nowak
DOI:10.1016/j.tet.2016.10.022
日期:2016.12
The synthesis of a series of new alkylsulfanyl phthalazinone and phthalazine derivatives is described. The target compounds were efficiently synthesized in a four step sequence, consisting of (1) cyclization of 2-formylbenzoic acid with hydrazine hydrate to form phthalazinone, (2) the direct bromination of phthalazinone core with KBr3, (3) alkylation of the obtained 4-bromolactam (Mitsunobu procedure)
描述了一系列新的烷基硫烷基酞嗪酮和酞嗪衍生物的合成。通过四个步骤有效地合成了目标化合物,包括以下步骤:(1)将2-甲酰基苯甲酸与水合肼环化以形成酞嗪酮,(2)用KBr 3直接溴化酞嗪酮核,(3)得到的烷基化产物。 4-溴内酰胺(Mitsunobu方法)制得N-以及O-烷基衍生物,最后生成(4)2-烷基-4-溴酞嗪酮和1-烷氧基-4-溴酞嗪衍生物与脂肪族硫醇的钯催化偶联反应。此外,合成了2-甲基-8-(丙-2-基)硫烷基-吡啶并[3,4- d ]吡啶并-1(2 H还描述了由2-甲基-吡啶并[3,4- d ]吡啶并嗪-1(2 H)-通过与KBr 3的溴化反应和随后在催化偶合反应条件下由异丙基硫醇进行的磺酰化反应制得的1 )-酮。