Heterobimetallic Ir–Sn catalysis: aza-Friedel–Crafts reaction of N-sulfonyl aldimines
摘要:
The heterobimetallic complex [Ir(COD)(SnCl3)Cl(mu-Cl)](2) catalyzes the aza-Friedel Crafts reaction of 1,3,5-trimethoxybenzene, as well as substituted indoles with N-sulfonyl aldimines leading to the formation of diarylamines and triarylmethanes in good yields. The symmetrical triarylmethanes were also obtained from diarylamines and suitable nucleophiles via simultaneous cleavage of sp(3) C-N bond and elimination of 1,3,5-trimethoxybenzene. (C) 2013 Elsevier Ltd. All rights reserved.
Synthesis of α-sulfanyl-β-amino acid derivatives by using nanocrystalline magnesium oxide
作者:M. Lakshmi Kantam、Koosam Mahendar、Bojja Sreedhar、Boyapati. M. Choudary、Suresh K. Bhargava、Steven H. Priver
DOI:10.1016/j.tet.2010.05.002
日期:2010.7
The Mannich-type reaction between alkyl, aryl and heterocyclic aldimines and sulfonium salts for the synthesis of α-sulfanyl-β-amino acidderivatives by using nanocrystalline magnesium oxide (NAP-MgO) is described. These products are obtained in moderate to high yields with moderate diastereoselectivities. The configuration of ethyl-3-[(4-methylphenyl)sulfonyl]amino}-2-(methylsulfanyl)-3-(4-nitrophenyl)propanoate
描述了烷基,芳基和杂环亚胺与M盐之间的曼尼希型反应,用于通过使用纳米晶状氧化镁(NAP-MgO)合成α-硫烷基-β-氨基酸衍生物。这些产品以中等至高收率获得,具有适度的非对映选择性。X射线衍射技术已证实3-[[(4-甲基苯基)磺酰基]氨基} -2-(甲基硫烷基)-3-(4-硝基苯基)丙酸乙酯(主要异构体)的构型是抗,并与基于1 H NMR光谱的赋值一致。这些α-硫烷基-β-氨基酸衍生物是具有强生物活性的药物的重要组成部分。
The Addition Reaction of Samarium Enolates and 2-Haloenolates Derived from Esters, and Amides to Imines. Totally Stereoselective Synthesis of Enantiopure 3,4-Diamino Esters or Amides
addition reaction of samarium enolates and 2-haloenolates derived from esters and amides to imines takes place in an efficient manner. A novel protocol to perform the addition reaction of samarium enolates derived from esters or amides to chiral 2-aminoimines, with total stereoselectivity and without racemization, is also reported. The use of samarium enolates in place of other classic metallic enolates
Organometallic reactions in aqueous media. Indium-mediated allylation of sulfonimines
作者:Tak Hang Chan、Wenshuo Lu
DOI:10.1016/s0040-4039(98)01926-1
日期:1998.11
Barbier-type allylation of sulfonimines with indium and allyl bromide to give homoallylic sulfonamides can be performed smoothly in organic solvents and in aqueousmedia. The regio- and the stereoselectivity of the reaction have been examined.
Transformations of 3-aryl-2-chloro-2-imidoylaziridines: novel entries to 4-chloro-2,5-diaryl-1H-imidazoles and 2-chloro-2-acylaziridines
作者:Filip Colpaert、Sven Mangelinckx、Nicola Giubellina、Norbert De Kimpe
DOI:10.1016/j.tet.2010.11.082
日期:2011.2
The reactivity of stereochemically defined 3-aryl-2-chloro-2-imidoylaziridines, an unexplored class of substituted aziridines, was investigated under various reaction conditions. 2-Chloro-2-imidoylaziridines underwent a novel thermal rearrangement by reflux in acetonitrile via C–C bond cleavage to 4-chloro-2,5-diarylimidazoles in high yield. Alternatively, a novel efficient entry toward 2-aroyl-2-chloroaziridines
Synthesis of Diversely Substituted Imidazolidines
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[3+2] Cycloaddition of 1,3,5‐Triazinanes with Donor‐Acceptor Aziridines and Their Anti‐Tumor Activity
cycloaddition of 1,3,5-triazinanes with donor-acceptor aziridines has been developed, accessing diverselysubstituted imidazolidines high efficiency. Mechanistic investigations support the formation of imidazolidines through an SN1-like pathway. Furthermore, these imidazolidines exhibit promising anti-tumor activity against a series of human cancer cell lines.
已经开发了AY(OTf)3催化的供体-受体氮丙啶与1,3,5-三嗪并[3 + 2]环加成反应,可高效获得各种取代的咪唑烷。机理研究支持通过S N 1样途径形成咪唑烷。此外,这些咪唑烷类化合物显示出对一系列人类癌细胞系的有希望的抗肿瘤活性。