Transition metal free K2CO3 mediated thioarylation, selenoarylation and arylation of 2-aminomaleimides at ambient temperature
作者:Mohit Saroha、Gaurav Bartwal、Jitender M. Khurana
DOI:10.1016/j.tet.2019.130486
日期:2019.9
Transition metal free thioarylation, selenoarylation and arylation of 2-aminomaleimide, using thiophenols, diaryldiselenides and arylhydrazine hydrochlorides respectively, has been reported in DMSO under aerobic condition in presence of K2CO3 at room temperature. The reaction occurs smoothly without prerequisite N-protection of 2-aminomaleimide. The synthesis of novel, polyfunctionalized maleimides
已经报道了在DMSO中在有氧条件下在室温下在室温下存在K 2 CO 3的情况下分别使用硫酚,二芳基二硒化物和芳基肼盐酸盐的过渡金属游离的硫代芳基化,2-氨基马来酰亚胺的芳基化和芳基化。该反应平稳进行而没有先决条件的2-氨基马来酰亚胺的N-保护。新型,多官能化的马来酰亚胺的合成已通过烯胺的直接C–H活化而实现。Thioarylation和selenoarylation提出要继续经由二硫化物/ diselenides和芳基化已提议将继续经由芳自由基。
Convenient Synthesis of Functionalized Tetracyclic Dihydrochromeno[2,3-b]pyrrolo[3,4-e]pyridine-triones via Four-Component Reactions
作者:Abdolali Alizadeh、Azar Rostampoor
DOI:10.1055/s-0042-1751504
日期:2024.1
In this research, a simple and efficient strategy for the straightforward synthesis of tetracyclic dihydrochromeno[2,3-b]pyrrolo[3,4-e]pyridine-trione derivatives is presented by a sequential four-component reaction of arylamines, dimethyl acetylenedicarboxylate, alkylamines, and 3-formylchromones as readily available starting materials in MeOH at room temperature. The merit of this sequential enamine
在这项研究中,通过芳胺、乙炔二甲酸二甲酯、烷基胺和 3-甲酰色酮作为室温下在甲醇中容易获得的起始原料。这种顺序烯胺形成/1,2-亲核加成/分子内氮杂-迈克尔加成的优点是其高节能(室温下反应时间短)、优异的收率、不含金属催化剂、易于纯化(产物可以通过简单过滤和用EtOH洗涤进行纯化,并且在一锅反应中绿色且温和的条件。据推测,以前没有关于此类杂环二氢苯并[2,3- b ]吡咯并[3,4- e ]吡啶三酮衍生物的合成的报道。
Microwave-assisted DABCO-promoted regioselective [3 + 3] tandem cyclization: synthesis of pyrrolo[3,4-<i>b</i>]pyridine-4-ones from trifluoromethyl-alkynyl esters and α-aminomaleimide
DABCO-promoted strategy for the regioselective synthesis of pyrrolo[3,4-b]pyridine-4-one derivatives has been developed from the [3 + 3] annulation of α-aminomaleimide with substituted ethyl 2-butynoate. The characteristic features of this methodology include operational simplicity, high regioselectivity, metal-free reaction conditions, and short reaction times. The potential utility of these methods
A simple and efficient protocol for direct synthesis of multisubstituted 6-alkyl-4-chromenyl-1-aryl-3,4-dihydro-1H-pyrrolo[3,4-b]pyridine-2,5,7(6H)-trione derivatives is presented by a cascade reaction of 3-formylchromones, Meldrum’s acid and α-aminomaleimides as readily accessible starting materials. In this chemoselective, metal catalyst-free approach Michael addition/intramolecular cyclization and
直接合成多取代的 6-烷基-4-苯并苯酰-1-芳基-3,4-二氢-1 H -吡咯并[3,4- b ]吡啶-2,5,7(6 H )的简单有效的方案-三酮衍生物是通过 3-甲酰色酮、Meldrum 酸和α-氨基马来酰亚胺作为容易获得的起始原料的级联反应而得到的。在这种化学选择性、无金属催化剂的方法中,迈克尔加成/分子内环化以及丙酮和二氧化碳的消除连续发生。该策略的显着优点是创建 C-N 和 C-C 键、反应时间短、产率优异 (68-80%) 以及不含金属的催化剂。 图形概要
2-Aminopyrrole-2,5-diones 2. Vinyl nucleophilic substitution of the alkylamino group in 1-alkyl-3-alkylaminopyrrole-2,5-diones by arylamines
作者:S. V. Chepyshev、Yu. N. Chepysheva、A. B. Ryabitskii、A. V. Prosyanik
DOI:10.1007/s10593-008-0071-z
日期:2008.5
In vinyl nucleophilic substitution (S(N)vin) with the hydrochlorides or 4-toluenesulfonates of primary arylamines 1-alkyl-3-alkylaminopyrrole-2,5-diones form the corresponding 1-alkyl-3-arylaminopyrrole- 2,5-diones, which are also produced in situ from the corresponding arylaminofumarates and primary alkylamines.