A palladium catalyzed atom-efficient cross-coupling reactivity of triarylbismuths with α,β-unsaturated acyl chlorides
作者:Maddali L.N. Rao、Varadhachari Venkatesh、Deepak N. Jadhav
DOI:10.1016/j.jorganchem.2008.05.012
日期:2008.7
An atom-efficientcross-coupling reactivity of triarylbismuths (1 equiv) was demonstrated by cross-couplingreaction with 3 equiv of α,β-unsaturated acylchlorides under palladium catalysis in the synthesis of a series of functionalized α, β-unsaturated ketones in high isolated yields.
ABSTRACT A new, rapid and efficient method for the synthesis of α,β-unsaturatedketones under microwave irradiation conditions is described. The process involves the reaction of acetals with aryl ketones in the absence of solvent using Lewis acids as catalysts under microwave irradiation to afford the α,β-unsaturatedketones in good to excellent isolated yields. The reaction mechanism is briefly discussed
Facile Epoxidation of α,β-Unsaturated Ketones with trans-3,5-Dihydroperoxy-3,5-dimethyl-1,2-dioxolane as an Efficient Oxidant
作者:Davood Azarifar、Kaveh Khosravi
DOI:10.1055/s-0030-1258996
日期:2010.11
Application of trans-3,5-dihydroperoxy-3,5-dimethyl-1,2-dioxolane as an efficient oxygen source has been explored in the epoxidation of trans-chalcones. The reactions proceed under mild conditions at room temperature in alkaline solution to afford the corresponding epoxides in excellent yields.
4,6-Diaryl-2-(pyrrolidin-1-yl)-nicotinonitriles 2a-k and 3-amino-2,4-dicyano-5-aryl-biphenyls 3a-c were synthesized from 1,3-diaryl-prop-2-en-1-ones 1a-k and malononitrile by a convenient one-pot method. Likewise, the reaction of aromatic aldehydes with malononitrile afforded 6-amino-4-aryl-2-(pyrrolidin-1-yl)-pyridine-3,5-dicarbonitriles 6a-f. The reaction of mesityl oxide with malononitrile gave 5-amino-7-(pyrrolidin-1-yl)-2,4,4-trimethyl-1,4-dihydro-1,6-naphthyridine-8-carbonitrile 8. The NLO studies of the pyridinedinitrile derivatives 6a, b, f showed a high value while that of nicotinonitrile 2b was weak. (C) 2003 Elsevier Science Ltd. All rights reserved.