<i>o</i>-Iodoxybenzoic Acid (IBX) as a Viable Reagent in the Manipulation of Nitrogen- and Sulfur-Containing Substrates: Scope, Generality, and Mechanism of IBX-Mediated Amine Oxidations and Dithiane Deprotections
作者:K. C. Nicolaou、Casey J. N. Mathison、Tamsyn Montagnon
DOI:10.1021/ja0400382
日期:2004.4.28
o-Iodoxybenzoic acid (IBX), a highly versatile hypervalent iodine(V) reagent, was found to efficiently mediate the dehydrogenation of amines in addition to facilitating the oxidative cleavage of dithioacetals and dithioketals. Through the development of relevant IBX-based protocols, a plethora of useful synthetic intermediates, including imines, oximes, ketones, and aromatic N-heterocycles, were found
Preparation of homoallylic amines <i>via</i> a three-component coupling process
作者:Xiaoxu Ou、Ricardo Labes、Claudio Battilocchio、Steven V. Ley
DOI:10.1039/c8ob01831f
日期:——
A three-componentsynthesis of homoallylicamines is described. The allylboronic species were generated in situ by homologation of vinyl boroxines with trimethylsilyldiazomethane, then followed by trapping of the allylboron intermediate with imines. Twenty-seven compounds were successfully prepared in moderate to high yields. Imines bearing various functional groups were tolerated, including aliphatic
<i>trans</i>-Symmetric Dynamic Covalent Systems: Connected Transamination and Transimination Reactions
作者:Fredrik Schaufelberger、Lei Hu、Olof Ramström
DOI:10.1002/chem.201500520
日期:2015.6.26
transaminations as a new type of dynamiccovalent reaction is described. The key 1,3‐proton shift is under complete catalytic control and can be conducted orthogonally to, or simultaneous with, transimination in the presence of an amine to rapidly yield two‐dimensional dynamicsystems with a high degree of complexity evolution. The transamination–transimination systems are proven to be fully reversible
Scandium triflate catalyzed cycloaddition of imines with 1,1-cyclopropanediesters: efficient and diastereoselective synthesis of multisubstituted pyrrolidines
作者:Yan-Biao Kang、Yong Tang、Xiu-Li Sun
DOI:10.1039/b512195g
日期:——
A tandem ring-opening–cyclization reaction of cyclopropanes with imines in the presence of 5 mol% of scandium triflate was developed for the highly diastereoselective synthesis of multisubstituted pyrrolidines.
An enantioselective Strecker synthesis employing novel chiral titaniumcomplex catalysts derived from structurally simple chiral N-salicyl-β-amino alcohols is described. Reactions of N-benzylidenebenzylamine with trimethylsilyl cyanide in the presence of the catalyst (10 mol%) gave the corresponding α-aminonitrile in good to excellent yields, along with relatively high enantioselectivity (up to 86%