Highly Selective Intra- and Intermolecular Coupling Reactions of Diazo Compounds to Form cis-Alkenes Using a Ruthenium Porphyrin Catalyst
摘要:
[Ru(2,6-Cl2TPP)(CO)] catalyzed intramolecular coupling reactions of bisdiazoacetates and intermolecular coupling reactions of monodiazoacetates to afford the coupling products in up to 76% and 93% yields, respectively. Only the cis isomers were obtained from the reactions. Employing such a ruthenium-catalyzed coupling reaction of a diazo compound as a key step allowed the synthesis of Patulolide B in 67% yield with a ratio of >40:1 against its trans isomer.
Multicomponent Combinatorial Polymerization via the Biginelli Reaction
作者:Haodong Xue、Yuan Zhao、Haibo Wu、Zilin Wang、Bin Yang、Yen Wei、Zhiming Wang、Lei Tao
DOI:10.1021/jacs.6b04425
日期:2016.7.20
A multicomponent combinatorial polymerization method has been exploited as a new intersection between combinatorial chemistry, polymer chemistry, and organicchemistry. The tricomponent Biginelli reaction has been employed as a model multicomponent reaction (MCR) to efficiently prepare a library of polycondensates with continuously changed chain structure but different physical properties. The naturally
作者:Alfred R. Bader、Lowell O. Cummings、Henry A. Vogel
DOI:10.1021/ja01153a045
日期:1951.9
Zinc mediated transesterification of β-ketoesters and coumarin synthesis
作者:Subhash P Chavan、K Shivasankar、R Sivappa、Ramesh Kale
DOI:10.1016/s0040-4039(02)02006-3
日期:2002.11
The transesterification of ketoesters using zinc and iodine is described. The reaction has been done on a variety of alcohols and phenols. Alcohols furnish transesterified products whereas phenols gave 4-methylcoumarins. The method is highly promising compared with existing methods. (C) 2002 Elsevier Science Ltd. All rights reserved.
Inner Complexes. II. Macrocyclic Beryllium Chelates and their Polymers<sup>1</sup>
作者:Rudolph W. Kluiber、Joseph W. Lewis
DOI:10.1021/ja01507a003
日期:1960.11
Efficient macrocyclization using methylene-tethered terminal dienes and bis(manganese(III)-enolate)s
作者:Yosuke Ito、Tomomi Yoshinaga、Hiroshi Nishino
DOI:10.1016/j.tet.2010.02.022
日期:2010.4
Macrocyclic compounds, which have two fused dihydrofuran rings, were synthesized with complete control by the oxidation of alpha,alpha,omega,omega-tetraaryl-alpha(omega-1)-alkadienes 1(x) with manganese(III)-oligomethylenebis(enolate) complexes directly formed by the reaction of the ohgomethylene bis(3-oxobutanoate)s 2(y) with manganese(III) acetate in situ The oxamethylene-tethered macrodiolides 5 and 7 were also produced in good to moderate yields by a similar oxidation The key intermediate, an election donor-acceptor-like complex, was proposed for the efficient macrocyclization reaction (C) 2010 Elsevier Ltd. All rights reserved