The tertiary amino effect in heterocyclic synthesis : mechanistic and computational study of the formation of six-membered rings
作者:L.C. Groenen、W. Verboom、W.H.N. Nijhuis、D.N. Reinhoudt、G.J. Van Hummel、D. Feil
DOI:10.1016/s0040-4020(01)86166-4
日期:1988.1
The mechanism of the ring closure of [2-(1-pyrrolidinyl)phenylmethylene]-propanedinitrile (2a) to l,2,3,3a,4,5-hexahydropyrrolo[1,2-a]quinoline-4,4-dicarbonitrile (3a) has been studied by kinetic measurements using 1H-NMR spectroscopy. It could be shown that the rate-determining step consists of an intramolecular 1,5 hydrogen transfer, which is accompanied by charge separation within the- molecule
[2-(1-吡咯烷基)苯基亚甲基]-丙腈(2a)对1,2,3,3a,4,5-六氢吡咯并[1,2 - a ]喹啉-4,4-二腈的闭环机理(3a)已经通过使用1 H-NMR光谱的动力学测量来研究。可以表明,确定速率的步骤由分子内1,5氢转移组成,该转移伴随着分子内的电荷分离。计算出的2a(AM1)和实验(X射线)分子结构非常吻合。在基态几何结构中,最有可能发生1.5的氢转移。随后,前一个乙烯基的旋转和CC键的形成(导致六元环)也以立体化学定义的方式发生。
"Tert-Amino effect" in heterocyclic synthesis. Formation of N heterocycles by ring-closure reactions of substituted 2-vinyl-N,N-dialkylanilines
作者:Willem Verboom、David N. Reinhoudt、Richard Visser、Sybolt Harkema
DOI:10.1021/jo00176a011
日期:1984.1
Lewis Acid Catalyzed Formation of Tetrahydroquinolines via an Intramolecular Redox Process
作者:Sandip Murarka、Chen Zhang、Marlena D. Konieczynska、Daniel Seidel
DOI:10.1021/ol802519r
日期:2009.1.1
Polycyclic tetrahydroquinolines were prepared by an efficient Lewis acid catalyzed 1,5-hydride shift, ring closure sequence. Gadolinium triflate was Identified as a catalyst that Is superior to scandium triflate as well as other Lewis acids. An approach toward a catalytic enantioselective variant Is also described.
An efficient microwave-assisted solvent-free synthesis of pyrido-fused ring systems applying the tert-amino effect
作者:Nadya Kaval、Beata Halasz-Dajka、Giang Vo-Thanh、Wim Dehaen、Johan Van der Eycken、Péter Mátyus、André Loupy、Erik Van der Eycken
DOI:10.1016/j.tet.2005.07.046
日期:2005.9
Significant improvements in the synthesis of pyrido-fused heterocycles were observed when performing the reaction under solvent-free conditions, applying the tert-amino effect as the key ring closure methodology. An unexpected cyclization of ortho-(1'-azacycloalkyl)benzaldehydes has been studied in water and on solid support. (c) 2005 Elsevier Ltd. All rights reserved.
VERBOOM, W.;REINHOUDT, D. N.;VISSER, R.;HARKEMA, S., J. ORG. CHEM., 1984, 49, N 2, 269-276
作者:VERBOOM, W.、REINHOUDT, D. N.、VISSER, R.、HARKEMA, S.