Asymmetric Stepwise Reductive Amination of Sulfonamides, Sulfamates, and a Phosphinamide by Nickel Catalysis
作者:Xiaohu Zhao、Haiyan Xu、Xiaolei Huang、Jianrong Steve Zhou
DOI:10.1002/anie.201809930
日期:2019.1.2
Asymmetricreductive amination of poorly nucleophilic sulfonamides was realized in the presence of nickel catalysts and titanium alkoxide. A wide range of ketones, including enolizable ketones and some biaryl ones, were converted into sulfonamides in excellent enantiomeric excess. The cyclization of sulfamates and intermolecular reductive amination of a diarylphosphinamide were also successful. Formic
Konfigurationsbeweis für<scp>L</scp>(+)-Valin und Konfigurationsermittlung von optisch aktivem 2-Amino-4-methyl-pentan und 2-Amino-3-methyl-butan
作者:P. Karrer、P. Dinkel
DOI:10.1002/hlca.19530360117
日期:——
Durch Überführung von L-Leucin in L-(+)-2-[p-Toluolsulfonyl-amino]-4-methyl-pentan (IV) und Darstellung derselben Verbindung aus (+)-2-Amino-4-methyl-pentan (VII) wird gezeigt, dass letzteres in seiner Konfiguration mit L-Leucin übereinstimmt, somit L-Konfiguration besitzt.
DurchÜberführungvon L-Leucin在L-(+)-2- [对甲苯磺酰基-氨基] -4-甲基戊烷(IV)和Darstellung derelben Verbindung aus(+)-2-Amino-4-methyl-pentan( VII)Wige gezeigt,围捕者Konfigration mit L-Leucinübereinstimmt中的dass letzteres,somit L-Konfiguration besitzt。
Braconnier, M.F.; Braekman, J.C.; Daloze, D., Bulletin des Societes Chimiques Belges, 1985, vol. 94, # 8, p. 605 - 614
作者:Braconnier, M.F.、Braekman, J.C.、Daloze, D.
DOI:——
日期:——
Nickel-Catalyzed Asymmetric Transfer Hydrogenation and α-Selective Deuteration of <i>N</i>-Sulfonyl Imines with Alcohols: Access to α-Deuterated Chiral Amines
A nickel-catalyzed enantioselective transferhydrogenation and deuteration of N-sulfonyl imines was developed. Excellent α-selectivity and high deuterium content were achieved by using inexpensive 2-propanol-d8 as a deuterium source. As a highlight, no deuteration of β-C–H and the remote C–H of N-sulfonyl amines occurred, which is hard to achieve using other imines or by hydrogen isotope exchange with