CS 2 CO 3与各种介导的多米诺benzalation反应的2-芳基-3-硝基-2- ħ -chromenes和4-苯亚甲基-2-苯基恶唑-5-(4 ħ) -酮已被实现。反应在宽范围的底物范围内平稳进行,从而以中等至高收率提供了多种取代的(Z)-4-((Z)-亚苄基)苯并三氢吡喃-3-酮肟,它们很容易转化为生物学上重要的4 H -chromeno [3,4- c ]异恶唑。
Molecular diversity of the domino annulation reaction of 2-aryl-3-nitrochromenes with pivaloylacetonitriles
作者:Wang Jiang、Jing Sun、Ru-Zhang Liu、Chao-Guo Yan
DOI:10.1039/c8ob01504j
日期:——
In the presence of triethylamine, the domino annulation reaction of two molecules of pivaloylacetonitrile with one molecule of 2-aryl-3-nitrochromene in tetrahydrofuran resulted in the unprecedented imino-substituted dihydrofuro[2,3-c]chromene derivatives in high yields.
Convenient construction of tetrahydrochromeno[4′,3′:2,3]indolizino[8,7-<i>b</i>]indoles and tetrahydroindolizino[8,7-<i>b</i>]indoles <i>via</i> one-pot domino reaction
作者:Jing Sun、Wang Jiang、Chao-Guo Yan
DOI:10.1039/c8ra05138k
日期:——
tetrahydrochromeno[4′,3′:2,3]indolizino[8,7-b]indoles were conveniently synthesized in high yields by one-pot domino reaction of tryptamines, alkyl propiolates and 2-aryl-3-nitro-2H-chromenes. Under similar conditions, the one-pot reaction of tryptamines, alkyl propiolates and β-nitroalkenes resulted in functionalized tetrahydroindolizino[8,7-b]indoles. The reaction mechanism involved sequential generation
通过色胺、丙炔酸烷基酯和2-芳基-3-硝基-2的一锅多米诺反应,方便、高产率地合成了功能化四氢苯并[4',3':2,3]吲嗪基[8,7- b ]吲哚H-色烯。在相似的条件下,色胺、丙炔酸烷基酯和β-硝基烯烃的一锅反应生成了功能化的四氢吲哚并[8,7- b ]吲哚。反应机理包括β-烯胺酯的连续生成、Michael加成、Pictet-Spengler反应和成环过程。该反应表现出较高的原子经济性并达到了可持续化学的目标。
Annulation reaction of methyl 2-(benzo[ b ][1,4]thiazin-3-ylidene)acetate with β -nitrostyrenes and 3-nitrochromenes
作者:Quan-Shun Sun、Jing Sun、Wang Jiang、Chao-Guo Yan
DOI:10.1016/j.tet.2018.01.027
日期:2018.3
The acid catalyzed domino reaction of β-nitrostyrenes with methyl 2-(benzo[b][1,4]thiazin-3-ylidene)acetate, which were previously prepared from the cyclization of 2-aminobenzenethiol and methyl 4-chloroacetoacetate, resulted in 2-arylbenzo[b]pyrrolo[1,2-d][1,4]thiazine-3-carboxylates in high yields. Under same reaction conditions, the similar reaction with 3-nitrochromenes afforded corresponding benzo[b]chromeno[4′
β-硝基苯乙烯与2-(苯并[ b ] [1,4]噻嗪-3-亚丙基)乙酸甲酯的酸催化多米诺反应,该反应是由2-氨基苯硫醇和4-氯乙酰乙酸甲酯的环化反应制得的。 2-芳基苯并[ b ]吡咯并[1,2- d ] [1,4]噻嗪-3-羧酸盐的收率很高。在相同的反应条件下,与3-硝基色酮的相似反应以良好的收率得到相应的苯并[ b ]铬基[4',3':4,5]吡咯并[1,2- d ] [1,4]噻嗪衍生物。
Diastereoselective synthesis of benzo[d]chromeno[3′,4′:3,4]pyrrolo[2,1-b]thiazoles via cycloaddition reaction of benzothiazolium salts with 3-nitrochromenes
作者:Wang Jiang、Jing Sun、Chao-Guo Yan
DOI:10.1039/c7ra06548e
日期:——
were also easily obtained by sequential oxidation with DDQ. The stereochemistry of the polycyclic compounds was clearly elucidated by analysis of NMR spectroscopy results and determination of single crystal X-ray structures. The reaction is believed to proceed via endo-[3 + 2] cycloaddition of the in situ generated anti-form ylides to the cyclic dipolarophiles.
室温下,在乙醇中,由三乙胺介导的溴化2-苯甲酰基-或2-烷氧基羰基甲基苯并噻唑鎓与3-硝基苯并茂的1,3-偶极环加成反应得到官能化的四氢苯并[ d ]色酚[3',4':3,4]吡咯并[2] ,1- b ]噻唑的产率为83–95%,非对映选择性高。相应的脱氢苯并[ d ]铬基[3',4':3,4]吡咯并[2,1- b ]噻唑也可以通过用DDQ顺序氧化而容易地获得。通过分析NMR光谱结果和确定单晶X射线结构,可以清楚地阐明多环化合物的立体化学。据信该反应是通过内-[3 + 2]环加成而进行的。原位产生的环状双极性亲抗剂。
Convenient Synthesis of Functionalized 3,4,10,11-tetrahydroindolo[1,2-a]Quinoxalines Via Three-component Reaction of Dimedone, 3-nitrochromenes and Ammonium Acetate
作者:Jun Fang、Chao-Guo Yan
DOI:10.1002/jhet.2345
日期:2016.5
An efficient synthetic procedure for the functionalized 3,4,10,11‐tetrahydroindolo[1,2‐a]quinoxalines was successfully developed by the three‐component reaction of dimedone, 3‐nitrochromenes, and ammoniumacetate in ethanol. This reaction has the advantages of using common starting material, short reaction process, and good yields high‐atom efficiency.