Utilization of industrial waste materials. Part 14.† Synthesis of β-amino alcohols and thiols with a 2-azabicyclo[3.3.0]octane backbone and their application in enantioselective catalysis
作者:Michael Kossenjans、Michael Soeberdt、Sabine Wallbaum、Klaus Harms、Jürgen Martens、Hans Günter Aurich
DOI:10.1039/a902362c
日期:——
New, chiral β-tert-amino tert-alcohols have been synthesized from the enantiomerically pure sec-amine (all-R)-1b via the new glycine, alanine and phenylglycine derivatives 2–6. Grignard additions to these esters provided the new rigid amino alcohols 7–11 in fair yields. The absolute configurations of the stereogenic centers, which arose during the alkylation step, were assigned by an independent route
通过对映体纯的仲胺(all-R)-1b通过新的甘氨酸,丙氨酸和苯基甘氨酸衍生物2-6合成了新的手性β-叔氨基氨基叔醇。这些酯的格利雅(Grignard)添加剂以合理的产率提供了新的7-11硬质氨基醇。在烷基化步骤中出现的立体异构中心的绝对构型是通过一条独立的途径分配的,该途径导致了一些7-10的光学对映体。对映体纯的β-氨基醇13a-g,16和17与γ-酮酸酯rac -12缩合得到N,O-缩醛14a-g,18和19,随后将其还原为β-叔丁基-氨基醇10a,c和15a–g。进行化合物19的X射线分析以验证通过化学相关性观察到的立体化学。对映体纯的苯乙烯氧化物被胺1b的亲核开环导致形成区域异构的氨基醇9a,21a和10a,21b。氨基硫醇衍生物22和25a,b分别通过用甲磺酰氯处理10a和15a,b,然后在原位进行区域和立体选择性切割而制备与硫代乙酸钾形成叠氮鎓离子。将这些化合物还原成硫醇23