Asymmetric chemoenzymatic synthesis of 1,3-diols and 2,4-disubstituted aryloxetanes by using whole cell biocatalysts
作者:Paola Vitale、Filippo Maria Perna、Gennaro Agrimi、Antonio Scilimati、Antonio Salomone、Cosimo Cardellicchio、Vito Capriati
DOI:10.1039/c6ob02320g
日期:——
could then be diastereoselectively transformed into optically active syn- or anti-1,3-diols by a careful choice of the chemical reducing agent (diastereomeric ratio up to 98 : 2). The latter, in turn, were stereospecifically cyclized into the corresponding oxetanes in 43–98% yields and in up to 94% ee, thereby giving a diverse selection of stereo-defined 2,4-disubstituted aryloxetanes.
在不同的全细胞微生物存在下研究了取代的1,3-芳基二酮的区域和立体选择性还原,发现该化合物可提供非常好的收率(高达95%)和对映异构体的β-羟基酮或1,3-二醇多余(高达96%)。可以通过面包酵母和罗伊氏乳杆菌DSM 20016生物还原以相反的立体偏好获得的对映体富集的醛醇,可以非对映选择性地转化为光学活性的顺式或反式-1,3-二醇可通过仔细选择化学还原剂(非对映异构体比例最高为98:2)来实现。后者依次以43-98%的收率和高达94%ee的立体定向环化成相应的氧杂环丁烷,从而提供了多种立体定义的2,4-二取代芳基氧杂环丁烷选择。