Carbonylative Cyclization of o-Halobenzoic Acids for Synthesis of N-Substituted Phthalimides Using Polymer-Supported Palladium-N-Heterocyclic Carbene as an Efficient, Heterogeneous, and Reusable Catalyst
作者:Bhalchandra Bhanage、Mayur Khedkar、Shoeb Khan、Kishor Dhake
DOI:10.1055/s-0032-1316565
日期:2012.8
Abstract The carbonylative cyclization of o-iodobenzoic acid with a variety of primary amines and carbon monoxide (1 bar) using a polymer-supported palladium–N-heterocyclic carbene complex (PS-Pd-NHC) as the catalyst gives N-substituted 1H-isoindole-1,3(2H)-diones (phthalimides) in good to excellent yields with a short reaction time. The catalyst is efficient, heterogeneous, and phosphine-free, it
摘要 的环化carbonylative ø -iodobenzoic酸与各种伯胺,并使用聚合物负载的钯- N-杂环卡宾配合物(PS-Pd的NHC)作为催化剂,得到N-取代的1一氧化碳(1巴)的ħ -异吲哚-1,3(2 H)-二酮(邻苯二甲酰亚胺),反应时间短,收率高至优异。该催化剂高效,多相且不含磷化氢,显示出显着的活性,并且可循环使用(连续4个循环)。在这些条件下,使用邻碘苯甲酸甲酯作为底物,也可得到N-取代的1 H-异吲哚-1,3(2 H)-二酮,但收率较低。o的环化在这些条件下,将碘代苄醇与一氧化碳一起得到异苯并呋喃-1(3 H)-一(邻苯二甲酰亚胺)。 的环化carbonylative ø -iodobenzoic酸与各种伯胺,并使用聚合物负载的钯- N-杂环卡宾配合物(PS-Pd的NHC)作为催化剂,得到N-取代的1一氧化碳(1巴)的ħ -异吲哚-1,3(2 H)-二酮(邻苯二甲