Highly efficient chemoselective N-TBS protection of anilines under exceptional mild conditions in the eco-friendly solvent 2-methyltetrahydrofuran
作者:Vittorio Pace、Andrés R. Alcántara、Wolfgang Holzer
DOI:10.1039/c1gc15574a
日期:——
A straightforward chemoselective protection of anilines as N-TBS derivatives is described by using a suitable deprotonation of the amine with methyllithium in the environmentally friendly and safer substitute of THF, 2-methyltetrahydrofuran, under exceptional mild reaction conditions (0 °C, 30 min). Interestingly, the protecting group maybe cleaved efficiently by simple treatment of N-TBS-anilines with silica gel in ethanol–water.
Reduction of azocompounds with a system of a trialkylchlorosilane and lithium has been found to afford bis(trialkylsilyl)amines in the presence of a transition metal halide as a catalyst in THF. The reaction course was significantly modified by using t-butyldimethylchlorosilane as a trialkylchlorosilane.
Stereoselective Amine Addition to Six-Membered Cyclic Nitronates Promoted by Silyl Triflate
作者:Andrey A. Mikhaylov、Alexander D. Dilman、Yulia A. Khomutova、Dmitry E. Arkhipov、Alexander A. Korlyukov、Sema L. Ioffe
DOI:10.1002/ejoc.201300511
日期:2013.9
N‐Silylamines add to six‐membered nitronates with high diastereoselectivity. The reaction follows an original mechanism in which thermodynamic control plays the key role.