Morita–Baylis–Hillman reaction of indole-2-carboxaldehyde: new vistas for indole-annulated systems
摘要:
DABCO-mediated Morita-Baylis-Hillman reactions of several 1-substituted-indole-2-carboxaldehydes are disclosed. It was discovered that carboethoxy or tert-butoxycarbonyl groups installed at N-1 undergo cleavage under the reaction conditions to afford 2-substituted indoles. Utility of the N-substituted adducts for preparing a variety of annulated indoles has been exemplified. (C) 2010 Elsevier Ltd. All rights reserved.
Altering the Cyclization Modes: Temperature-Dependent Intramolecular 7-<i>Endo-Dig</i> vs 6-<i>Endo-Dig</i> Electrophilic Ring Closures
作者:Maloy Nayak、Young Kee Kang、Ikyon Kim
DOI:10.1021/acs.orglett.7b00472
日期:2017.3.17
intramolecular alkyne carbonyl metathesis, two distinctive modes of cyclization were revealed to depend on the reaction temperatures. 5H-Benzo[e]pyrrolo[1,2-a]azepine-1-carbaldehydes with a substituent at the C11 position were obtained as major products at 90 °C as a result of intramolecular 7-endo-dig cyclization, while 6-endo-dig ringclosure by electrophilic addition of nitrogen of the pyrrole to a
在尝试通过酸催化的分子内炔烃羰基复分解反应构建10-酰基-5 H-苯并[ e ]吡咯并[1,2- a ]氮杂环庚烷时,发现两种独特的环化方式取决于反应温度。5 ħ -苯并[ ë ]吡咯并[1,2一]获得具有在C11位置的取代基氮杂-1- carbaldehydes作为主要产物在90℃下为分子内7-结果内切挖环化,而6 -内挖在某些情况下,在40°C时观察到在酸性介质下亲电将吡咯的氮加成至乙烯基阳离子上,然后进行空前的多米诺骨牌重排过程,从而导致闭环,从而生成5-芳基-11 H-苯并[ d ]吡咯并[ 1,2- a ]氮杂-1-甲醛与以前的产品。
Germain, Andrew L.; Gilchrist, Thomas L.; Kemmitt, Paul D., Heterocycles, 1994, vol. 37, # 2, p. 697 - 700
作者:Germain, Andrew L.、Gilchrist, Thomas L.、Kemmitt, Paul D.
DOI:——
日期:——
1—Azatriene cyclisation as a route to annelated pyrido[4,3- b ]indoles
作者:Thomas L. Gilchrist、Paul D. Kemmitt、Andrew L. Germain
DOI:10.1016/s0040-4020(97)00117-8
日期:1997.3
Derivatives of indole-3-carbaldehyde oxime have been prepared that bear a carbon-carbon double bond at C-2 and a five- or six-membered ring linking the alpha-carbon artom of the vinyl group and the indole nitrogen atom. Compound 9, with a five-membered ring linking the two atoms, failed to undergo a cyclisation reaction on heating. However the oximes 16 and 22, with a six-memberd ring linking the two atoms. cyclised in boiling toluene. The cyclisation led to the formation of the pyrido-indoles 17 and 18, respectively. (C) 1997 Elsevier Science Ltd.
Morita–Baylis–Hillman reaction of indole-2-carboxaldehyde: new vistas for indole-annulated systems
作者:Subhasish Biswas、Virender Singh、Sanjay Batra
DOI:10.1016/j.tet.2010.07.078
日期:2010.9
DABCO-mediated Morita-Baylis-Hillman reactions of several 1-substituted-indole-2-carboxaldehydes are disclosed. It was discovered that carboethoxy or tert-butoxycarbonyl groups installed at N-1 undergo cleavage under the reaction conditions to afford 2-substituted indoles. Utility of the N-substituted adducts for preparing a variety of annulated indoles has been exemplified. (C) 2010 Elsevier Ltd. All rights reserved.