Development of Versatile <i>cis</i>- and <i>trans</i>-Dicarbon-Substituted Chiral Cyclopropane Units: Synthesis of (1<i>S</i>,2<i>R</i>)- and (1<i>R</i>,2<i>R</i>)-2-Aminomethyl-1-(1<i>H</i>-imidazol-4-yl)cyclopropanes and Their Enantiomers as Conformationally Restricted Analogues of Histamine
作者:Yuji Kazuta、Akira Matsuda、Satoshi Shuto
DOI:10.1021/jo010852x
日期:2002.3.1
conformations. We designed (1S,2R)- and (1R,2R)-2-aminomethyl-1-(1H-imidazol-4-yl)cyclopropanes (1 and 2, respectively) and their enantiomers (ent-1 and ent-2) as conformationally restricted analogues of histamine. The four types of chiral cyclopropanes bearing two differentially functionalized carbon substituents in a cis or trans relationship on a cyclopropane ring, (1S,2R)-2-(tert-butyldiphenylsil
环丙烷环可有效地用于限制生物活性化合物的构象以提高活性并研究生物活性构象。我们设计了(1S,2R)-和(1R,2R)-2-氨基甲基-1-(1H-咪唑-4-基)环丙烷(分别为1和2)及其对映异构体(ent-1和ent-2)作为组胺的构象受限类似物。四种类型的手性环丙烷在环丙烷环上带有两个不同官能化的碳取代基,它们具有顺式或反式关系,(1S,2R)-2-(叔丁基二苯基甲硅烷氧基)甲基-1-甲酰基环丙烷(7)和(1R,2R)开发了-2-(叔丁基二苯基甲硅烷氧基)甲基-1-甲酰基环丙烷(8)及其对映异构体(ent-7和ent-8)作为合成1、2,ent-1和ent-2的关键中间体。(R)-表氯醇[(R)-12]和苯磺酰基乙腈(13a)在NaOEt存在下于EtOH中的反应,然后用酸处理,以82%的收率得到了98%ee的手性环丙烷内酯11a。通过以Mg / MeOH为关键步骤的还原性脱磺酰化作用,将化