Stereoselective multigram-scale synthesis of cis- and trans-β-phenylproline derivatives
作者:Isabel Rodríguez、M. Isabel Calaza、Ana I. Jiménez、Carlos Cativiela
DOI:10.1016/j.tet.2012.09.069
日期:2012.11
phenyl substituent attached to the pyrrolidine β carbon (cis- and trans-β-phenylproline) have been developed. The cis derivative was synthesized from N-Boc-β-alanine in six steps and 78% overall yield. The generation of a vinyl triflate with full regiochemical control together with a high-yielding cross-coupling reaction and a completely stereoselective hydrogenation are at the basis of the high efficiency
已经开发出克级制备脯氨酸类似物的克级制备的有效途径,所述脯氨酸类似物带有连接到吡咯烷β碳上的苯基取代基(顺式和反式-β-苯基脯氨酸)。所述顺式衍生物合成自Ñ -Boc-β丙氨酸的六个步骤和78%的总收率。具有充分的区域化学控制以及高产率的交叉偶联反应和完全立体选择性氢化的三氟甲磺酸乙烯酯的生成是该方法高效的基础。顺式β-苯基脯氨酸衍生物与双(三甲基甲硅烷基)酰胺锂的差向异构体提供了进入反式异构体的途径。