Enantioselective hydrogenation of (Z)- and (E)-β-arylenamides catalyzed by rhodium complexes of monodentate chiral spiro phosphorous ligands: a new access to chiral β-arylisopropylamines
A highly enantioselective rhodium-catalyzedhydrogenation of both (Z)- and (E)-β-arylenamides was developed by using monodentate chiral spiro phosphite and phosphine ligands, respectively. The hydrogenation reaction provides an efficient access to optically active β-arylisopropylamines, important building blocks for the synthesis of biologically active compounds.
An efficient cobalt-catalyzed asymmetrichydrogenation of internal simple enamides has been developed, especially its convergent pattern for E/Z-substrates. Excellent enantioselectivity, wide substrate scope, and valuable applications were shown.
作者:B. D. Vineyard、W. S. Knowles、M. J. Sabacky、G. L. Bachman、D. J. Weinkauff
DOI:10.1021/ja00460a018
日期:1977.8
Hansen, John F.; Kim, Yong In; McCrotty, Stephen E., Journal of Heterocyclic Chemistry, 1980, vol. 17, p. 475 - 479
作者:Hansen, John F.、Kim, Yong In、McCrotty, Stephen E.、Strong, Scott A.、Zimmer, Douglas E.
DOI:——
日期:——
A Simple Method for Synthesis of 4-Dimethylamino-2,6-dimethyl-5-phenylpyrimidines
作者:Wojciech Zielinski、Monika Mazik
DOI:10.3987/com-92-6318
日期:——
The reaction of N-(1-methyl-2-phenylvinyl)acetimidoyl chloride and its derivatives substituted at the benzene ring with N,N-dimethylcyanamide was studied. At the first stage, linear products like 1-chloro-1-dimethylamino-3,5-dimethyl-6-phenyl-2,4-diaza-1,3,5-hexatrienes were obtained. They underwent cyclization to 4-dimethylamino-2,6-dimethyl-5-phenylpyrimidines in alkaline medium at elevated temperature.