Synthesis of chiral and achiral analogues of ambroxol via palladium-catalysed reactions
作者:Anna L. E. Larsson、Roberto G. P. Gatti、Jan-E. Bäckvall
DOI:10.1039/a702141k
日期:——
Chiral cis- and trans-4-aminocyclohex-2-enols and achiral 4-aminocyclohexanols, which all are analogues of ambroxol, are prepared via stereoselective allylic substitution of cyclohex-2-ene-1,4-diol derivatives or 1-acetoxy-4-chlorocyclohex-2-ene. The chiral target molecules are obtained in enantiomerically pure form by employing a previously described enantiodivergent synthesis of cis- and trans-4-aminocyclohex-2-enols. It has been found that bis(amine) nucleophiles 7a and 7b react only at the benzylic amino group under the conditions employed.
手性 cis-和 trans-4-氨基环己烯-2-醇以及非手性 4-氨基环己醇,均为安必洛尔的类化物,通过环己烯-2-二醇衍生物或 1-乙酸氧基-4-氯环己烯的立体选择性烯丙基取代反应制备而成。通过之前描述的 cis-和 trans-4-氨基环己烯-2-醇的手性差异合成方法,获得了手性靶分子,且其对映体纯度很高。研究发现,双(胺)亲核试剂 7a 和 7b 在所用条件下仅在苄基氨基团反应。