Palladium(0)-Catalyzed Isomerization Reactions of Aziridines Bearing an α,β-Unsaturated Ester Group: A Thermodynamic Preference for Chiral Alkyl (2<i>E</i>)-4,5-<i>cis</i>-4,5-Epimino-<i>N</i>-(alkyl- or arylsulfonyl) 2-Enoates over the Other Three Stereoisomers
作者:Toshiro Ibuka、Norio Mimura、Hiroaki Ohno、Kazuo Nakai、Masako Akaji、Hiromu Habashita、Hirokazu Tamamura、Yoshihisa Miwa、Tooru Taga、Nobutaka Fujii、Yoshinori Yamamoto
DOI:10.1021/jo962094u
日期:1997.5.1
Palladium(0)-catalyzed reactions of five sets of four stereoisomeric 4,5-epimino-N-(methanesulfonyl) or -N-(arylsulfonyl) 2-enoates reveal that 4,5-cis-(2E)-isomers are thermodynamically more stable than other isomers, in accord with calculations. A highly stereoselective synthesis of (E)-alkene dipeptide isosteres having the desired stereochemistries from unwanted stereoisomeric 4,5-epimino-N-(arylsulfonyl)
钯(0)催化的五组四个四个立体异构体4,5-表氨-N-(甲磺酰基)或-N-(芳基磺酰基)2-烯酸酯的反应表明,4,5-顺式((2E))异构体的热力学性质更高根据计算,该化合物比其他异构体稳定。还提出了由不想要的立体异构体4,5-表观氨基-N-(芳基磺酰基)2-烯酸酯的具有所需立体化学的(E)-烯烃二肽等排物的高度立体选择性合成。