Synthesis of 2-Amino-3,4-dihydroquinazolines and Imidazo[2,1-b]quinazoline-2-ones¹
作者:Sanjay Batra、Amita Mishra
DOI:10.1055/s-0029-1217603
日期:2009.9
SN2 reaction of a primary amine on the Baylis-Hillman acetate derived from 2-nitrobenzaldehyde, cyanogen bromide-mediated nitrile addition, and iron-acetic acid promoted reductive cyclization. This approach is also applied to the preparation of imidazo[2,1-b]quinazoline-2-ones and imidazo[2,1-b]quinazolines in one pot. quinazoline - anagrelide - Baylis-Hillman - imidazo[2,1-b]quinazoline -allyl amine
公开了由Baylis-Hillman衍生物合成2-氨基-3,4-二氢喹唑啉的直接方法。该方案涉及伯胺在源自2-硝基苯甲醛的Baylis-Hillman乙酸酯上的顺序S N 2反应,溴化氰介导的腈加成反应以及铁乙酸促进的还原环化反应。该方法也适用于在一锅中制备咪唑并[ 2,1- b ]喹唑啉-2-ones和咪唑并[2,1- b ]喹唑啉。 喹唑啉-Anagrelide-Baylis-Hillman-咪唑并[2,1- b ]喹唑啉-烯丙基胺 CDRI通讯第7780号。
The Baylis–Hillman approach to quinoline derivatives
作者:Oluwole B. Familoni、Phindile J. Klaas、Kevin A. Lobb、Vusumzi E. Pakade、Perry T. Kaye
DOI:10.1039/b608592j
日期:——
Baylis-Hillman reactions of 2-nitrobenzaldehydes with various activated alkenes afford adducts that undergo reductivecyclisation to quinoline derivatives. The chemo- and regioselectivity of cyclisation appears to be influenced by the choice of both the substrate and the reagent system, and competing reactions have been observed.
Straightforward Strategy for the Stereoselective Synthesis of Spiro-Fused (C-5)Isoxazolino- or (C-3)Pyrazolino-(C-3)quinolin-2-ones from Baylis-Hillman Adducts by 1,3-Dipolar Cycloaddition and Reductive Cyclization
作者:Virender Singh、Vijay Singh、Sanjay Batra
DOI:10.1002/ejoc.200800746
日期:2008.11
A straightforward and general approach for the stereoselectivesynthesis of spiro-fused (C-5)isoxazolino- or (C-3)pyrazolino-(C-3)quinolin-2-onesfrom the adducts offorded from the Baylis–Hillman reaction of 2-nitrobenzaldehyde and ethyl acrylate by sequential 1,3-dipolarcycloaddition and reductivecyclization is presented. It was found that the reductivecyclization of the isoxazoline derivatives
Synthesis of 3-Substituted Quinolines via Transition-Metal-Catalyzed Reductive Cyclization of <i>o</i>-Nitro Baylis−Hillman Acetates
作者:David K. O'Dell、Kenneth M. Nicholas
DOI:10.1021/jo034447c
日期:2003.8.1
Reductive cyclization of o-nitro-substituted Baylis-Hillman acetates by carbon monoxide, catalyzed by [Cp*Fe(CO)(2)](2), gives moderate to good yields of 3-substituted quinolines.
Synthesis of Substituted 1H- and 3H-1-Benzazepines and Rearrangement of Alkyl 1H-1-Benzazepine-2-carboxylates into Isoquinolines
作者:Vijay Singh、Sanjay Batra
DOI:10.1002/ejoc.200700175
日期:2007.6
reduction of nitro groups in 2-nitro-4-(2-nitrobenzylidene)alkanoates and 4-nitro-2-(2-nitroalkylidene)alkanoates allows the facile synthesis of substituted 1H-1-benzazepines and 3H-1-benzazepines. This reaction proceeds via SN2′ reaction of ethyl nitroacetate and nitroethane with the acetyl derivatives of Baylis–Hillman adducts deriving from 2-nitro-substituted benzaldehydes. During the study, an unprecedented