Allylic Oxidations Catalyzed by Dirhodium Catalysts under Aqueous Conditions
申请人:Doyle Michael P.
公开号:US20090093638A1
公开(公告)日:2009-04-09
The present invention relates to compositions and methods for achieving the efficient allylic oxidation of organic molecules, especially olefins and steroids, under aqueous conditions. The invention concerns the use of dirhodium (II,II) “paddlewheel complexes, and in particular, dirhodium carboximate and tert-butyl hydroperoxide as catalysts for the reaction. The use of aqueous conditions is particularly advantageous in the allylic oxidation of 7-keto steroids, which could not be effectively oxidized using anhydrous methods, and in extending allylic oxidation to enamides and enol ethers.
Nonheme Iron-Mediated Amination of C(sp<sup>3</sup>)–H Bonds. Quinquepyridine-Supported Iron-Imide/Nitrene Intermediates by Experimental Studies and DFT Calculations
作者:Yungen Liu、Xiangguo Guan、Ella Lai-Ming Wong、Peng Liu、Jie-Sheng Huang、Chi-Ming Che
DOI:10.1021/ja3122526
日期:2013.5.15
(1, qpy = 2,2':6',2″:6″,2''':6''',2''''-quinquepyridine) is a highly active nonheme iron catalyst for intra- and intermolecular amination of C(sp(3))-H bonds. This complex effectively catalyzes the amination of limiting amounts of not only benzylic and allylic C(sp(3))-H bonds of hydrocarbons but also the C(sp(3))-H bonds of cyclic alkanes and cycloalkane/linear alkane moieties in sulfamate esters,
Efficient aziridination of olefins catalyzed by dirhodium catalysts
申请人:Doyle P. Michael
公开号:US20060211870A1
公开(公告)日:2006-09-21
This invention relates to compositions and methods for achieving the efficient aziridination of organic molecules, especially olefins. More specifically, the invention is directed to a mild, selective, and efficient aziridination protocol that involves catalysis by a mixed-valent dirhodium(II,III) catalyst (Rh
2
5+
). Especially preferred sources for forming such mixed-valent dirhodium(II,III) catalyst (Rh
2
5+
) are dirhodium(II) carboxamidates, such as dirhodium(II) caprolactamate, and their derivatives and analogues.
[EN] NOVEL PROCESS FOR THE SYNTHESIS OF ENANTIOMERICALLY PURE 2-METHOXY-5-[(2R)-2-(4-ALKYLPIPERAZIN-L-YL)PROPYL]-BENZENESULFONAMIDE<br/>[FR] NOUVEAU PROCÉDÉ DE SYNTHÈSE DE 2-MÉTHOXY-5-[(2R)-2-(4-ALKYLPIPÉRAZIN-L-YL)PROPYL]-BENZÈNESULFONAMIDE ÉNANTIOMÉRIQUEMENT PUR
申请人:HAVALDAR FREDDY H
公开号:WO2012101648A1
公开(公告)日:2012-08-02
Where R is C1-C3 alkyl, alkenyl A novel process for synthesis of compound of Formula 1 comprising steroselective catalytic reduction of compound of Formula IV under hydrogen gas pressure to obtain an intermediate compound of Formula II, which on coupling in presence of coupling agent and base in presence of organic solvent to obtain compound of Formula X, Formula X on reacting with deprotecting agent in presence of organic solvent results in formation of compound of Formula XI, condensation of Formula XI with alkyl halide results in formation of compound of Formula I.
Highly Efficient Alkene Epoxidation and Aziridination Catalyzed by Iron(II) Salt + 4,4′,4′′-Trichloro-2,2′:6′,2′′-terpyridine/4,4′′-Dichloro-4′-<i>O</i>-PEG-OCH<sub>3</sub>-2,2′:6′,2′′-terpyridine
作者:Peng Liu、Ella Lai-Ming Wong、Angella Wing-Hoi Yuen、Chi-Ming Che
DOI:10.1021/ol801157m
日期:2008.8.7
"Iron(II) salt + 4,4',4"-trichloro-2,2':6',2"-terpyridine" is an effective catalyst for epoxidation and aziridination of alkenes and intramolecular amidation of sulfamate esters. The epoxidation of allylic-substituted cycloalkenes achieved excellent diastereoselectivities up to 90%. ESI-MS results supported the formation of iron-oxo and -imido intermediates. Derivitization of Cl(3)terpy to O-PEG-OCH3-Cl(2)terpy renders the terpyridine unit to be recyclable, and the "iron(II) salt + 4,4"-dichloro-4'-O-PEG-OCH3-2,2':6',2"-terpyridine" protocol can be reused without a significant loss of catalytic activity in the alkene epoxidation.