Competitive formation of condensed azines and dihydropyridines in the reaction of ethyl 3,3-diaminoacrylate with o-halo carbaldehydes
摘要:
The reaction of ethyl 3,3-diaminoacrylate with quinoline-3-carbaldehydes and 3-nitrobenzaldehydes to give a dihydropyridine and condensed azine has been studied with respect to the number and reactivity of the halogen atoms in an ortho position to the formyl groups. For the series of quinoline-3-carbaldehydes it was found that the reaction course is determined by the number of chlorine atoms. 2-and 4-Chloroquinoline-3-carbaldehydes give dihydropyridines and a benzo[c][2,7-]naphthyridine is formed in the reaction with 2,4-dichloroquinoline-3-carbaldehyde. The main products in the case of nitrobenzaldehydes are dihydropyridines which points the deciding influence of the low electrophilicity of aromatic ring.
摘要 提出了一种通过双烯二胺和π-缺陷的1,2-二卤代芳烃合成稠合的2-氨基吡咯的有效方法。两步法包括用二烯二胺C-亲核中心芳族亲核取代二卤代芳烃的活化卤素,然后进行Cu催化的分子内N-芳基化。该方法允许在温和条件下以中等和良好收率获得各种2-氨基-6-硝基吲哚和6-氨基吡咯并[3,2- d ]嘧啶(包括N-单-和N,N-二取代)。 提出了一种通过双烯二胺和π-缺陷的1,2-二卤代芳烃合成稠合的2-氨基吡咯的有效方法。两步法包括用二烯二胺C-亲核中心芳族亲核取代二卤代芳烃的活化卤素,然后进行Cu催化的分子内N-芳基化。该方法允许在温和条件下以中等和良好收率获得各种2-氨基-6-硝基吲哚和6-氨基吡咯并[3,2- d ]嘧啶(包括N-单-和N,N-二取代)。
Chemoselective cyclocondensation of α-acylacetamidines with 2-methylsulfanyl-4,6-dichloropyrimidine-5-carbaldehyde
作者:S. G. Ryazanov、S. I. Selivanov、D. V. Dar’in、P. S. Lobanov、A. A. Potekhin
DOI:10.1134/s1070428008020176
日期:2008.2
Cyclocondensation of α-acylacetamidine with 2-methylsulfanyl-4,6-dichloropyrimidine-5-carbaldehyde proceeds chemo- and regioselectively involving replacement by the α-carbon of the amidine of the chlorine in the aromatic ring and a reaction of the amino group with the formyl group.
Synthesis of cinnoline 1-oxides by the reaction of ortho-fluoronitrobenzenes with enediamines
作者:A. V. Vypolzov、D. V. Dar’in、P. S. Lobanov
DOI:10.1007/s11172-012-0123-5
日期:2012.4
Reaction of α-carbonylacetamidines existing in the enediamine tautomeric form with the substituted ortho-fluoronitrobenzene afforded products of the replacement of the fluorine by the α-C atom of amidine. The latter underwent cyclization into cinnoline 1-oxides on treatment with sodium hydride.
Reactions of 3,3-diaminoacrylic acid derivatives with o-haloarenecarbonitriles. Synthesis of fused azines
作者:E. M. Igumnova、S. I. Selivanov、D. V. Dar’in、P. S. Lobanov
DOI:10.1007/s10593-012-1011-5
日期:2012.6
The interaction of the ethyl ester or pyrrolidide of 3,3-diaminoacrylic acid with aromatic and heteroaromatic nitriles containing a labile halogen atom in the ortho position, leads to the formation of products of its substitution by the α-carbon atom of the diaminoacrylic acidderivative. The compounds obtained are cyclized smoothly into fused diaminoazines.
Rearrangement of the adducts of α-(aminocarbonyl)-acetamidoximes with acylacetylenes, leading to 2-aminopyrrole derivatives*
作者:E. E. Pivneva、A. V. Galenko、D. V. Dar’in、P. S. Lobanov
DOI:10.1007/s10593-012-1069-0
日期:2012.9
The rearrangement and cyclization of O-vinylamidoximes, which are adducts of α-(aminocarbonyl)-acetamidoximes with acetylenic ketones, leads to 2-acylaminopyrroles.
Cyclocondensation of α-acylacetamidines with esters of 2-fluoro-5-nitrobenzoic and 4-chloro-2-methyl-5-pyrimidinecarboxylic acids
作者:D. V. Dar’in、S. G. Ryazanov、S. I. Selivanov、P. S. Lobanov、A. A. Potekhin
DOI:10.1007/s10593-008-0064-y
日期:2008.4
The cyclocondensation of alpha-acylacetamidines with esters of 2-fluoro-5-nitrobenzoic and 4-chloro-2-methyl-5-pyrimidinecarboxylic acids leads to condensed azines. The reaction proceeds chemoselectively such that the alpha-carbon atom of the amidine replaces the halogen atom in the aromatic ring, while the amino group reacts with the ester group.