(±)-3-Methyl-1,1-diphenyl-2-butyl 3-Acetamidocrotonate and its Hydrogenation Product
作者:A. Chiaroni、C. Riche、F. Dumas、D. Potin、J. d'Angelo
DOI:10.1107/s0108270193007383
日期:1995.5.15
Synthesis of (+/-)-3-methyl-1,1-diphenyl-2-butyl beta-acetamidobutanoate, C23H29NO3, (10), With high diastereoisomeric excess was achieved by asymmetric hydrogenation of the stereogenic title compound, C23H27NO3, (9), in which the chirality is present in the ester part. The acetamidocrotonate (9) is planar and delimits a pro-R and a pro-S face. An intramolecular hydrogen bond between the amino group and the carboxylate group is essential to ensure planarity. One of the phenyl rings of the ester hinders one face. The hydrogenation occurs by the opposite face as proved by the crystal structure of its product of hydrogenation, (10).