H
<sub>2</sub>
Activation by Non‐Transition‐Metal Systems: Hydrogenation of Aldimines and Ketimines with LiN(SiMe
<sub>3</sub>
)
<sub>2</sub>
作者:Daniel C. Elliott、Alex Marti、Pablo Mauleón、Andreas Pfaltz
DOI:10.1002/chem.201805549
日期:2019.2.6
In recent years, H2 activation at non‐transition‐metal centers has met with increasing attention. Here, a system in which H2 is activated and transferred to aldimines and ketimines using substoichiometric amounts of lithium bis(trimethylsilyl)amide is reported. Notably, the reaction tolerates the presence of acidic protons in the α‐position. Mechanistic investigations indicated that the reaction proceeds
In Situ-Generated Iodonium Ylides as Safe Carbene Precursors for the Chemoselective Intramolecular Buchner Reaction
作者:Shanyan Mo、Xinhao Li、Jiaxi Xu
DOI:10.1021/jo501628h
日期:2014.10.3
A chemoselective intramolecular Buchner reaction employing iodoniumylides as safe carbene precursors has been developed. Iodoniumylides are generated in situ from N-benzyl-2-cyanoacetamides and PhI(OAc)2 in the presence of base and undergo intramolecular Buchner reaction under catalysis from Cu(OAc)2·H2O, affording fused cyclohepta-1,3,5-triene derivatives in up to 85% yield. The N,N-dibenzyl-2-cyanoacetamides
Rapid and Efficient Access to Secondary Arylmethylamines
作者:Nicolas Fleury-Brégeot、Jessica Raushel、Deidre L. Sandrock、Spencer D. Dreher、Gary A. Molander
DOI:10.1002/chem.201200831
日期:2012.7.27
Ammoniomethyl trifluoroborates are very powerful reagents that can be used to access biologically relevant aryl‐ and heteroaryl‐methylamine motifs via Suzuki–Miyaura cross‐couplings. Until now, this method was limited to the production of tertiary and primary amines. The synthesis of a large array of secondary ammoniomethyltrifluoroborates has been achieved through a one step nucleophilic substitution