Asymmetric synthesis and σ receptor affinity of enantiomerically pure 1,4-disubstituted tetrahydro-1H-3-benzazepines
作者:Syed Masood Husain、Marie Theres Heim、Dirk Schepmann、Bernhard Wünsch
DOI:10.1016/j.tetasy.2009.05.017
日期:2009.7
A very short (three steps) asymmetric synthesis of enantiomerically pure 1,4-disubstituted tetrahydro-1H-3-benzazepines 14 has been elaborated upon, starting from the trans- and cis-configured 11a-substituted 3-phenyl-2,3,11,11a-tetrahydro[1,3]oxazolo[2,3-b]-[3]-benzazepin-5(6H)-ones 6 and 7. The stereoisomerically pure lactams 6 and 7 were benzylated to give 6-benzyl-substituted products 8 and 9.
非常短的(三步)不对称对映体纯的1,4-二取代四氢-1的合成ħ -3-苯并吖庚因14已被详细阐述,从起始的反式-和顺-型11a的取代的3-苯基-2,3- ,11,11a-四氢[1,3]恶唑并[2,3- b ]-[3] -苯并ze庚因-5(6 H)-一个6和7。将立体异构纯的内酰胺6和7苄基化,得到6-苄基取代的产物8和9。NOE实验显示反苄基残基和11a-位残基的-构型表明苄基化反应的立体化学受11a-位的立体中心控制。用AlCl 3 / LiAlH 4(1/3)还原苄基化的三环苯并内酰胺8和9,得到1,3,4-三取代的3-苯并pine庚因12和13,它们立体选择性地形成并保留构型。最后,通过氢解裂解去除N-(2-羟基-1-苯乙基)残基,形成对映体纯的1,4-二取代的3-苯并ze庚因14。的σ 1,σ 2对映体纯3-苯并ze庚因14和ent - 14的NMDA受体亲和力已在竞争性受体结合研究中进行了研究。丁基衍生物ENT