Phosphine-Catalyzed Annulations between Modified Allylic Derivatives and Polar Dienes and Substituent Effect on the Annulation Mode
作者:Junjun Tian、Haiyun Sun、Rong Zhou、Zhengjie He
DOI:10.1002/cjoc.201300646
日期:2013.10
In this work, the phosphine‐catalyzed annulationreactions between modifiedallylic derivatives and polar 1,1‐dicyano‐1,3‐dienes have been studied. In the catalysis of PPh3 (20 mol%), a [4+1] annulationreaction is realized between a series of 1,1‐dicyano‐2,4‐diaryl‐1,3‐dienes and ethoxycarbonyl‐activatedallylic acetate, producing polysubstituted cyclopentenes in modest to excellent yields. It is
Cu(OAc)<sub>2</sub>/DABCO-mediated domino reaction of vinyl malononitriles with cyclic sulfamidate imines: access to 6-hydroxyaryl-2-aminonicotinonitriles
A novel Cu(II)–salt/DABCO-mediated one-pot access to a myriad of highly substituted biologically relevant 2-aminonicotinonitriles possessing a resourceful phenolic moiety with satisfactory yields is reported. This method involves cyclic sulfamidate imines as 1C1N sources and different kinds of acyclic/cyclic vinyl malononitriles as 4C sources for pyridine synthesis via a vinylogous Mannich-cycloaromatization
New conditions for the synthesis of thiophenes via the Knoevenagel/Gewald reaction sequence. Application to the synthesis of a multitargeted kinase inhibitor
作者:David M. Barnes、Anthony R. Haight、Thomas Hameury、Maureen A. McLaughlin、Jianzhang Mei、Jason S. Tedrow、Joan Dalla Riva Toma
DOI:10.1016/j.tet.2006.07.008
日期:2006.12
Novel conditions have been developed for the preparation of substituted 2-aminothiophenes employing the Knoevenagel condensation followed by the Gewald reaction. The benefits of these conditions are their mildness, and the ease of product isolation. Thus, the Knoevenagel condensation is run in the presence of hexamethyldisilazane and acetic acid, which combine to perform the roles of desiccant, and catalyst. The Gewald reaction is performed with inorganic base in THF/water, which suppresses byproduct formation. This process has been employed in the total synthesis of a multitargeted kinase inhibitor. (c) 2006 Elsevier Ltd. All rights reserved.
Elagamey, Abdel-Ghani Ali, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1988, vol. 27, # 1-12, p. 766 - 768
作者:Elagamey, Abdel-Ghani Ali
DOI:——
日期:——
ELAGAMEY, ABDEL-GHANI ALI, INDIAN J. CHEM. B, 27,(1988) N, C. 766-768