Synthesis of
4H
‐chromene‐isoxazole hybrids via
ortho
‐hydroxy directing cyclization of isoxazole‐styrenes and Michael addition of imino‐chromenes in aqueous medium
摘要:
AbstractA green, efficient, and one‐pot method synthesis of functionalized 4H‐chromene‐isoxazole hybrids is reported via o‐hydroxy group directing cyclization of isoxazole‐styrenes and Michael addition of 3,5‐dimethyl‐4‐nitroisoxazole on 2‐imino‐2H‐chromene‐3‐carbonitrile (independent methods). The developed methodology was further extended for nitromethane, malononitrile, and alkylcyanoacetates as Michael donors.
Enantioselective vinylogous Michael addition of β,γ-unsaturated butenolide to 2-iminochromenes
作者:Vijay Gupta、Ravi P. Singh
DOI:10.1039/c9nj01584a
日期:——
An efficient organocatalyzed asymmetric synthesis of 2-amino-4-(2-furanone)-4H-chromene-3-carbonitriles via vinylogous Michael addition of non-activated β,γ-unsaturated butenolide to 2-iminochromenes has been realized.
Organocatalytic conjugate addition promoted by multi-hydrogen-bond cooperation: access to chiral 2-amino-3-nitrile-chromenes
作者:Wenjun Li、Jiayao Huang、Jian Wang
DOI:10.1039/c2ob27102h
日期:——
A new efficient enantioselective conjugate addition strategy has been disclosed to rapidly construct 2-amino-3-nitrile-chromene complexes via a multi-hydrogen-bond cooperative activation model.
The reaction of salicylic aldehydes with malononitrile was reinvestigated, and the reaction pathway was followed by 1H NMR spectroscopy. A delicate control of the experimental conditions allowed the synthesis of 2-imino-2H-chromene-3-carbonitriles 1, (2-amino-3-cyano-4H-chromen-4-yl)malononitriles 2, 4-amino-5-imino-2,7-dimethoxy-5H-chromeno[3,4-c]pyridine-1-carbonitrile 12, and (4,5-diamino-1-cyano-1
重新研究了水杨醛与丙二腈的反应,并通过1 H NMR光谱追踪了反应路径。的实验条件微妙控制允许的2-亚氨基-2-合成ħ色烯-3-腈1,(2-氨基-3-氰基-4- ħ -苯并吡喃-4-基)丙二腈2,4-氨基5-亚氨基-2,7-二甲氧基-5- ħ -chromeno [3,4 ç ]吡啶-1-甲腈12,和(4,5-二氨基-1-氰基1,10b二氢-2 ħ -chromeno [3,4- c ]吡啶-2-亚基)丙二腈13。两个新颖的2-亚氨基二烯二聚体,分别具有结构8和9,被隔离和充分表征。化合物8a对曲霉属的活性。生长和曲霉毒素A的产生进行了评估。生物测定的结果表明,以2mM的浓度施用的化合物8a完全抑制了所测试的真菌的生长。赭曲霉毒素A的生产由曲霉alliaceus减少了约93%的与该化合物的200μM溶液。观察到对类似结构8b的中等抑制作用,并且未发现对用作二聚体8的合成前体的化合物2和1有抑制作用。
New HA 14-1 analogues: synthesis of 2-amino-4-cyano-4H-chromenes
作者:Leila Moafi、Somayeh Ahadi、Ayoob Bazgir
DOI:10.1016/j.tetlet.2010.09.090
日期:2010.12
The synthesis of 2-amino-4-cyano-4H-chromene derivatives as new HA 14-1 analogues by a simple and efficient method is reported. In addition, the reaction of 2-amino-2H-chromene-3-carbonitriles, salicylaldehydes and amines results in the formation of new chromeno[2,3-d]pyrimidine derivatives.
据报道,通过一种简单而有效的方法合成了2-氨基-4-氰基-4 H-色烯衍生物作为新的HA 14-1类似物。此外,2-氨基-2 H-亚甲基-3-腈,水杨醛和胺类的反应导致形成新的苯并[2,3- d ]嘧啶衍生物。
Visible light induced, catalyst free, convenient synthesis of chromene nucleus and its derivatives using water–ethanol mixture as a solvent