NHC–copper hydrides as chemoselective reducing agents: catalytic reduction of alkynes, alkyl triflates, and alkyl halides
作者:Nick Cox、Hester Dang、Aaron M. Whittaker、Gojko Lalic
DOI:10.1016/j.tet.2014.04.004
日期:2014.7
as well as the NHC–copper-catalyzed reduction of primary alkyl triflates and primary and secondary alkyl iodides and bromides are described. The high chemoselectivity demonstrated in these examples illustrates the mild nature of copper hydride complexes as reducing agents, which have applications in synthetic chemistry beyond their traditional role in the reduction of activated alkenes and carbonyl compounds
Monophasic Catalytic System for the Selective Semireduction of Alkynes
作者:Aaron M Whittaker、Gojko Lalic
DOI:10.1021/ol4001679
日期:2013.3.1
A highly efficient semireduction of alkynes has been developed. Using 0.5–2 mol % of a copper catalyst, semireduction can be accomplished with a wide range of substrates, including both internal and terminal alkynes without over-reduction. The new method has excellent chemoselectivity, and the semireduction can be accomplished even in the presence of nitro and aryl iodo groups. Finally, commercial
Catalytic Asymmetric Synthesis of Cyclic Sulfamides from Conjugated Dienes
作者:Richard G. Cornwall、Baoguo Zhao、Yian Shi
DOI:10.1021/ol303469a
日期:2013.2.15
This paper describes the catalytic asymmetric diamination of alkyl dienesusing N,N′-di-tert-butylthiadiaziridine 1,1-dioxide in the presence of Pd(0) and a chiral phosphoramidite ligand to give cyclic sulfamides in high yield and high ee. The diamination is also amenable to gram scale.
本文描述了在 Pd(0) 和手性亚磷酰胺配体存在下使用N , N '-二叔丁基噻二氮丙啶 1,1-二氧化物催化不对称二烯二胺化,以高产率和高 ee 得到环状磺酰胺。该二胺化也适合克级规模。
Lewis acid mediated claisen-type rearrangement of aryl dienyl ethers