Dirhodium(II)-Mediated Alkene Epoxidation with Iodine(III) Oxidants
作者:Ali Nasrallah、Gwendal Grelier、Maria Ivana Lapuh、Fernando J. Duran、Benjamin Darses、Philippe Dauban
DOI:10.1002/ejoc.201800306
日期:2018.11.15
combination of the dirhodium(II) complex Rh2(tpa)4 (tpa = triphenylacetate) with the iodine(III) oxidant PhI(OPiv)2 is shown to promote the epoxidation of alkenes in the presence of 2 equivalents of water. The reaction can be applied to diversely substituted alkenes and the corresponding epoxides are isolated with yields of up to 90 %. A possible mechanism involves the dirhodium(II) complex as a Lewis
Dirhodium (II) 络合物和碘 (III) 氧化剂已在合成氮烯化学中找到有用的应用。在这项研究中,二铑(II)配合物 Rh2(tpa)4(tpa = 三苯乙酸盐)与碘(III)氧化剂 PhI(OPiv)2 的组合被证明在 2 当量的水。该反应可应用于不同取代的烯烃,并以高达 90% 的产率分离相应的环氧化物。一种可能的机制涉及二铑 (II) 络合物作为路易斯酸物质,它可以调节碘 (III) 试剂的氧化特性。
Intermolecular C–H Amination of Complex Molecules: Insights into the Factors Governing the Selectivity
appropriate tether securing intramolecular addition of the nitrene, the intermolecular C–H amination remains much less predictable. This study aims at addressing this issue by capitalizing on an efficient stereoselective nitrene transfer involving the combination of a chiral aminating agent 1 with a chiral rhodium catalyst 2. Allylic C–H amination of terpenes and enol ethers occurs with excellent yields as well
Preparation of chiral 6,7-dihydroxy geranyloxy compounds
申请人:DSM CATALYTICA PHARMACEUTICALS, INC.
公开号:US20020095061A1
公开(公告)日:2002-07-18
The present invention provides a method for enantioselectively producing a nonracemic 6,7-dihydroxy geranyloxy compound from a geranyloxy compound. In particular, methods of the present invention involve enantioselectively epoxidizing the geranyloxy compound and hydrolyzing the epoxide moiety under conditions sufficient to produce the nonracemic 6,7-dihydroxy geranyloxy compound.