Antimitotic agents. Alterations at the 2,3-positions of ethyl (5-amino-1,2-dihydropyrido[3,4-b]pyrazin-7-yl)carbamates
作者:Carroll Temple、Gregory A. Rener、Robert N. Comber、William R. Waud
DOI:10.1021/jm00115a005
日期:1991.11
with alpha-amino ketone oximes gave 4-[(2-oxoethyl)amino]pyridine oximes 3, which were reductively cyclized to give a series of ethyl (1,2-dihydro-pyrido[3,4-b]pyrazin-7-yl)carbamates (6). In another approach, alpha-nitro ketones, alpha-oximino ketones, and alpha-nitro alcohols were reduced to give alpha-amino alcohols, which were reacted with 2 to give 4-[(2-hydroxyethyl)amino]pyridines (5). Oxidation
Highly enantioselective asymmetric transfer hydrogenation (ATH) of α-phthalimide ketones
作者:Zhou Xu、Yong Li、Jing Liu、Nan Wu、Ke Li、Songlei Zhu、Rongli Zhang、Yi Liu
DOI:10.1039/c5ob00568j
日期:——
A mild catalyst system for the synthesis of chiral amino alcohols via asymmetric transfer hydrogenation (ATH) of α-phthalimide ketones has been developed by using a chiral Ru-TsDPEN complex as the catalyst in DMF/MeOH at 40 °C. The reaction exhibits high reaction activity and excellent enantioselectivity where up to 96% yield and 99% ee of the product were obtained.
Ru-Catalyzed Asymmetric Hydrogenation of α-Phthalimide Ketones and 1,3-Diaryl Diketones Using 4,4‘-Substituted BINAPs
作者:Aiguo Hu、Wenbin Lin
DOI:10.1021/ol0474812
日期:2005.2.1
A family of tunable precatalysts [NH2Et2][Ru(4,4'-BINAP)Cl}(2)(mu-Cl)(3)] was synthesized and used for highly enantioselective hydrogenation of phthalimide-protected amino ketones and 1,3-diaryldiketones. The bulky groups on the 4,4'-positions of BINAP were believed to be responsible for the enhancement of enantioselectivity (and diasteroselectivity) in these reactions.