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。
Reductive-Cyclization-Mediated Synthesis of Fused Polycyclic Quinolines from Baylis-Hillman Adducts of Acrylonitrile: Scope and Limitations
作者:Virender Singh、Samiran Hutait、Sanjay Batra
DOI:10.1002/ejoc.200900336
日期:2009.7
The synthesis of a variety of polycyclicquinolines is described. The target molecules were obtained in two steps by an initial reductive cyclization followed by another intramolecular cyclization in the allylamines afforded from either the acetates or allyl bromides of Baylis–Hillmanadducts of 2-nitrobenzaldehydes and acrylonitrile. The two steps proceeded in one-pot for those substrates in which
Baylis-Hillman Acetates in Synthesis: Copper(I)/<i>tert</i>-Butyl Hydroperoxide Promoted One-Pot Oxidative Intramolecular Cyclization Protocol for the Preparation of Pyrrole-Fused Compounds and the Formal Synthesis of (±)-Crispine A
A convenient one-pot protocol for the synthesis of benzo-fused and indole-fused indolizines from Baylis–Hillman acetates was developed. This strategy involves CuBr/tert-butyl hydroperoxide promoted oxidation, intramolecular cyclization, and aromatization as key steps. The efficacy of this methodology was demonstrated by the formal synthesis of (±)-crispine A, a biologically active molecule.
A Facile Construction of 6-(Arylmethyl)imidazo[1,2-<i>a</i>]pyrimidin-7-ylamines from Allylamines Derived from Baylis-Hillman Adducts
作者:Somnath Nag、Amita Mishra、Sanjay Batra
DOI:10.1002/ejoc.200800448
日期:2008.9
A facile and convenient synthesis of substituted imidazo[1,2-a]pyrimidin-7-ylaminesfrom the allylamine derivatives afforded by the Baylis–Hillman acetates of substituted benzaldehydes and heterocyclic aldehydes by treatment with cyanamide is described. Interestingly, the allylamines afforded by heterocyclic aldehydes, which undergo fast Baylis–Hillman reaction, were discovered to undergo a one-pot
The first use of hydroxylamine derivatives as the aminoxy equivalent of nucleophiles in palladium catalyzed addition to Baylis–Hillman acetateadducts is described. The reaction proceeds smoothly to give the substituted allyloxy amines in good yield and selectivity.