Asymmetric Organocatalytic Tandem Reaction to Chiral Pyrimidinone Derivatives using Urea as Dinitrogen Source
作者:Zhao‐Quan He、Quan Zhou、Li Wu、Ying‐Chun Chen
DOI:10.1002/adsc.201000291
日期:2010.10.9
A facile method for the asymmetric synthesis of pyrimidinone derivatives was developed via an organocatalytic tandem aza-Michael addition–hemiaminal formation–dehydroxylation reaction, using N,N′-dialkyloxyurea as dinitrogen source (up to 97% ee). The transformations of hemiaminal intermediates to pyrimidinones with more complex structures have been also investigated.
A Novel Class of Zinc-Binding Inhibitors for the Phosphatidylcholine-Preferring Phospholipase C from <i>Bacillus</i> <i>c</i><i>ereus</i>
作者:Stephen F. Martin、Bruce C. Follows、Paul J. Hergenrother、Christopher L. Franklin
DOI:10.1021/jo9915731
日期:2000.7.1
transduction cascades in mammalian systems, there has been considerable interest in the development of inhibitors of these enzymes. Toward this end, we have discovered that the cyclic N,N'-dihydroxyureas 6-10 inhibit the phosphatidylcholine preferring PLC fromBacilluscereus (PLCBc). This class of inhibitors is believed to function by the bidentate chelation of the N,N'-dihydroxyurea array to one or more
Oxidative 1,4-Diamination of Dienes Using Simple Urea Derivatives
作者:Devendar Anumandla、Ryan Littlefield、Christopher S. Jeffrey
DOI:10.1021/ol502460j
日期:2014.10.3
Diamination of alkenes and dienes has found widespread use in the synthesis of biologically active target molecules. Although the 1,2-diamination of alkenes has been comprehensively explored, versatile methods that install higher order 1,n-diamine moieties (e.g., n = 3–5) are not broadly developed. Herein, we report the development of an oxidative 1,4-diamination of dienes. This method represents one
Electrochemical Generation of Diaza-oxyallyl Cation for Cycloaddition in an All-Green Electrolytic System
作者:Longji Li、Sanzhong Luo
DOI:10.1021/acs.orglett.8b00057
日期:2018.3.2
The electro-oxidative generation of diaza-oxyallyl cation and its application to the synthesis of diamine motifs has been explored. Because of the synergistic combination of anodic and cathodic reactions, the current electrochemical method not only avoids the use of a stoichiometric amount of chemical oxidant but also eliminates the need for supporting electrolyte and external base required for effective
Vinylogous Aza‐Michael Addition of Urea Derivatives with
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‐Quinone Methides Followed by Oxidative Dearomative Cyclization: Approach to Spiroimidazolidinone Derivatives
作者:Navpreet Kaur、Priyanka Singh、Prabal Banerjee
DOI:10.1002/adsc.202100077
日期:2021.6.8
report an efficient protocol for the synthesis of spiro-imidazolidinone-cyclohexadienones from p-quinone methides (p-QMs) and dialkyloxy ureas under mild conditions. The strategy follows a two-step process involving an initial vinylogous conjugate addition of urea derivatives to p-QMs, followed by oxidative dearomative cyclization of open-chain product to the projected spiro-imidazolidinones. This protocol