One-Pot Synthesis of Pyrimidines via Cyclocondensation of β-Bromovinyl Aldehydes with Amidine Hydrochlorides
作者:Shengjiao Yan、Yajuan Tang、Fuchao Yu、Jun Lin
DOI:10.1002/hlca.201000264
日期:2011.3
A series of pyrimidines were prepared by cyclocondensation of β‐bromovinyl aldehydes with amidinehydrochlorides in the presence of Et3N in excellent yields (74–95%).
One-Pot Stereoselective Synthesis of (<i>Z</i>)-β-Ketoenamides from β-Halo α,β-Unsaturated Aldehydes
作者:Junali Gogoi、Pranjal Gogoi、Romesh C. Boruah
DOI:10.1002/ejoc.201400007
日期:2014.6
β-ketoenamides have been synthesized from their corresponding β-halo α,β-unsaturatedaldehydes. This synthetic methodology provides efficient access to (Z)-β-ketoenamides. The structures of these products have been unambiguously established by single crystal XRD studies. This process is found to be mild and inexpensive. The required β-halo α,β-unsaturatedaldehydes are synthesized from corresponding ketones using
Divergent NHC-Catalyzed Oxidative Transformations of 3-Bromoenal: Selective Synthesis of 2<i>H</i>-Pyran-2-ones and Chiral Dihydropyranones
作者:Gang Wang、Xia Chen、Gaohan Miao、Weijun Yao、Cheng Ma
DOI:10.1021/jo400950j
日期:2013.6.21
A selectivesynthesis of either 2H-pyran-2-ones (4) or chiral dihydropyranones (6) from the same substrates of 3-bromoenals and 1,3-dicarbonyl compounds upon oxidative N-heterocyclic carbene catalysis is presented. It is shown that the oxidative transformation of 3-bromoenals under NHC catalyst can be well controlled to proceed through two pathways, i.e., elimination of reducible β-bromide or by an
Palladium-Catalyzed One-Pot Sonogashira Coupling,<i>exo</i>-<i>dig</i>Cyclization and Hydride Transfer Reaction: Synthesis of Pyridine-Substituted Pyrroles
作者:Kommuri Shekarrao、Partha Pratim Kaishap、Sanjib Gogoi、Romesh C. Boruah
DOI:10.1002/adsc.201401117
日期:2015.4.13
An efficient palladium(II)‐catalyzed method for the synthesis of alkylated pyridine‐substituted pyrroles has been developed by a one‐pot three component reaction of β‐bromovinyl aldehydes, primary amines and 2‐alkynylpyridines in good yields. The reactions can also provide an efficient route to 2‐picolinoylpyrroles by slightly altering the reaction conditions.