已经发现三氟乙酸是用于串联克莱森重排和环化反应以从由S N 2反应获得的化合物产生3-芳基亚甲基-3,4-二氢-1 H-喹啉-2-酮的高效和高效试剂。DABCO存在下苯胺与丙烯酸Bayis-Hillman加合物的乙酰基衍生物之间的关系。相反,在三氟乙酸处理下,从Baylis-Hillman丙烯腈加成物的乙酰基衍生物获得的类似化合物通过串联Claisen重排,环化和异构化直接提供3-芳基甲基-2-氨基-喹啉。
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
A Reinvestigation into the Reaction of NH<sub>4</sub>OAc with Acetyl Derivatives of Baylis-Hillman Adducts: Formation of Tertiary and Secondary Allyl Amines Instead of Primary Allyl Amines
A reinvestigation into the reaction between ammonium acetate and the acetyl derivatives of Baylis-Hillman adducts has led us to conclude that the products obtained are tertiary and secondary allyl amines and not the primary allyl amines. The unambiguous assignment of the structure of products using chemical and spectroscopic methods is described.
Synthesis of substituted 3-methylene-2-pyridones from Baylis–Hillman derivatives and its application for the generation of 2-pyridone substituted spiroisoxazolines
作者:Virender Singh、Gaya P. Yadav、Prakas R. Maulik、Sanjay Batra
DOI:10.1016/j.tet.2008.01.074
日期:2008.3
The synthesis of substituted 3-methylene-2-pyridones via S(N)2 displacement reaction of nucleophiles bearing a keto group on the acetyl derivative of Baylis-Hillman adducts of acrylonitrile followed by TFA/H2SO4-mediated intramolecular cyclization is described. The utility of these pyridone derivatives for the synthesis of new spiroisoxazolines in highly regio- and stereo-selective fashion is also illustrated. The structure of the spiroisoxazolines has been secured via X-ray crystallographic analysis. (C) 2008 Elsevier Ltd. All rights reserved.