Nitrene Transfer Reactions Catalyzed by Gold Complexes
作者:Zigang Li、Xiangyu Ding、Chuan He
DOI:10.1021/jo060016t
日期:2006.8.1
We report here the first gold-catalyzed nitrenetransferreaction. A gold(I) compound, supported by 4,4‘,4‘ ‘-tri-tert-butyl-2,2‘:6‘,2‘ ‘-terpyridine (tBu3tpy) as the ligand, efficiently catalyzes olefin aziridination with the use of the commercially available oxidant PhI(OAc)2 and sulfonamides. This system also mediates carbene insertion into benzene.
我们在这里报告了第一个金催化的腈转移反应。由4,4',4''-三叔丁基-2,2':6',2'-叔吡啶(t Bu 3 tpy)担载的金(I)化合物有效催化烯烃使用可商购的氧化剂PhI(OAc)2和磺酰胺进行叠氮化。该系统还介导卡宾插入苯中。
Cooperative Effect of Two Metals: CoPd(OAc)<sub>4</sub>-Catalyzed CH Amination and Aziridination
intramolecular CHamination and aziridination reactions were developed. Sulfamate esters were converted to oxathiazinanes by using CoPd(OAc)4 as catalyst and PhI(OAc)2 as oxidant. The mutual presence of both Co and Pd is crucial for the catalytic activity. This combination of twometals with simple acetate ligands provides an economical alternative to the Rh‐catalyzed insertion of nitrenoids into CH bonds
Oxidative Cyclization of Sulfamates onto Pendant Alkenes
作者:Anand H. Shinde、Shyam Sathyamoorthi
DOI:10.1021/acs.orglett.9b04448
日期:2020.2.7
This communication discloses the first examples of aza-Wacker cyclizations of sulfamate esters. Within the realm of related cyclization reactions, this protocol is differential in that it forms six-membered rings in good yield and uses catalytic amounts of palladium(0) rather than palladium(II) salts. These reactions scale well, and their products are demonstrated to be valuable synthetic intermediates
该通讯公开了氨基磺酸酯的氮杂-瓦克环化的第一个例子。在相关环化反应领域内,该协议的不同之处在于它以良好的产率形成六元环,并使用催化量的钯 (0) 而不是钯 (II) 盐。这些反应规模很大,它们的产物被证明是有价值的合成中间体。
Intramolecular PhIO Mediated Copper-Catalyzed Aziridination of Unsaturated Sulfamates: A New Direct Access to Polysubstituted Amines from Simple Homoallylic Alcohols
作者:Fernando Duran、Loïc Leman、Alberto Ghini、Gerardo Burton、Philippe Dauban、Robert H. Dodd
DOI:10.1021/ol0200899
日期:2002.7.1
sulfamates derived from primary and secondary alcohols undergo intramolecular copper-catalyzed aziridination in the presence of iodosylbenzene to afford novel bicyclic fused aziridines. The latter were opened by various nucleophiles to give the corresponding substituted cyclic sulfamates, which in turn reacted, after nitrogen activation, with a second nucleophile at the carbon atom bearing the oxygen
Intramolecular copper-catalyzed aziridination of sulfamates occurs in very good yields of up to 86% and in up to 84% ee in the presence of (4S,4′S)-2,2′-(propane-2,2-diyl)bis(4-tert-butyl-4,5-dihydro-1,3-oxazole). The resulting aziridines undergo smooth ring opening with different types of nucleophiles in an SN2-type process.