The bisected s-trans conformation-controlled highly stereoselective addition of Grignard reagents to C-cyclopropylaldonitrone. An efficient synthesis of 1-phenyl-2-[(S )-1-aminoalkyl]-N,N-diethylcyclopropanecarboxamides, a new class of potent NMDA receptor antagonists
作者:Yuji Kazuta、Satoshi Shuto、Hiroshi Abe、Akira Matsuda
DOI:10.1039/b008230i
日期:——
stereoelectronic effects of the cyclopropane ring, by X-ray crystallographic analysis, NMR studies, and theoretical calculations. Based on these findings, the highly stereoselective addition reaction of Grignard reagents to C-cyclopropylaldonitrone 6 was developed, and the reaction was successfully used as the key step for the preparation of the NMDA receptor antagonists 1a and 1b as well as for a newly
有效合成1-苯基-2-[(S)-1-氨基乙基]-和1-苯基-2-[(S -1-氨基丙基)-N,N-二乙基环丙烷甲酰胺[ 1a(PEDC)和1b( PPDC)],有效NMDA受体拮抗剂具有环丙烷结构。我们首次证明,由于C-环丙基醛基的特征性立体电子效应,C-环丙基铝亚硝基优先存在于二等分的S-反式构象中。环丙烷环, 经过 X射线晶体学分析, 核磁共振研究和理论计算。基于这些发现,高度立体选择性加成反应 的 格氏试剂到ç -cyclopropylaldonitrone 6被开发,并且将反应物成功地用作用于的制备关键步骤NMDA受体拮抗剂 1a和1b以及新设计的异丙基型同类物1c。添加的面部选择性格氏试剂可以通过试剂从预测的一分为二的反式构象受阻程度较小的底物一侧进攻来解释。这个格氏反应是通过非螯合控制途径向硝酮高度立体选择性加成的第一个例子。