Synthesis of tetrahydrophthalazine and phthalamide (phthalimide) derivatives via palladium-catalysed carbonylation of iodoarenes
作者:Diána Marosvölgyi-Haskó、Andrea Petz、Attila Takács、László Kollár
DOI:10.1016/j.tet.2011.09.095
日期:2011.11
4-Tetrahydrophthalazin-1-one and 1,2,3,4-tetrahydrophthalazin-1,4-dione derivatives were synthesised in high (up to 85%) and low yields using 2-iodobenzyl bromide and 1,2-diiodobenzene as bifunctional substrates, respectively. Iodoarenes, carbon monoxide and various hydrazine derivatives as N-nucleophiles were used in a three-component palladium-catalysed cascade hydrazinocarbonylation. A similar palladium-catalysed
1,2,3,4-四氢酞嗪-1-酮和1,2,3,4-四氢酞嗪-1,4-二酮衍生物是使用2-碘代苄基溴和1的高产率(高达85%)和低产率合成的,2-二碘苯分别作为双功能底物。碘芳烃,一氧化碳和各种作为N-亲核试剂的肼衍生物被用于三组分钯催化的级联肼羰基化反应中。类似的钯催化反应,即1,2-二碘苯的氨基羰基化反应,主要导致形成两种主要产物,具体取决于胺N-亲核试剂:使用伯胺可产生N取代的邻苯二甲酰亚胺进行双羰基化,同时仲胺与碘芳烃官能团之一反应,得到相应的2-碘代苯甲酰胺。由于在一个或两个碘代芳烃官能团处插入一氧化碳两次,可以通过改变反应条件来分离出酮羧酰胺-羧酰胺或双酮羧酰胺衍生物。还讨论了闭环反应的一些机理细节和导致副产物的条件。