Highly Stereocontrolled Access to 1,1,1-Trifluoro-2,3-epoxypropane via Lipase-Mediated Kinetic Resolution of 1,1,1-Trifluoro-3-(phenylthio)propan-2-ol and Its Application
Highly Stereocontrolled Access to 1,1,1-Trifluoro-2,3-epoxypropane via Lipase-Mediated Kinetic Resolution of 1,1,1-Trifluoro-3-(phenylthio)propan-2-ol and Its Application
Preparation of Sulfur-Containing Optically Active Secondary Alcohols Based on<i>Pichia farinosa</i>-Catalyzed<i>anti</i>-Prelog-Rule Reduction as the Key Step
A Pichia farinosa IAM 4682 mediated reduction of sulfur containing ketones afforded secondaryalcohols with (R)-absolute configuration. For example, 4-(phenylthio)-2-butanone and 4-(phenylsulfonyl)-2-butanone afforded (R)-4-(phenylthio)-2-butanol (91%ee) in 90% yield and (R)-4-(phenylsulfonyl)-2-butanol (97%ee) in 94% yield, respectively. In the case that the ee of the product was not satisfactory
Pichia farinosa IAM 4682 介导的含硫酮还原得到具有 (R)-绝对构型的仲醇。例如,4-(苯硫基)-2-丁酮和4-(苯磺酰基)-2-丁酮以90%的产率提供(R)-4-(苯硫基)-2-丁醇(91%ee)和(R)- 4-(苯磺酰基)-2-丁醇(97%ee)分别为94%产率。在产品的ee不令人满意的情况下,任何污染的(S)-对映体被玫瑰色红球菌IFO 15564选择性氧化,留下纯的(R)-对映体。进一步检查了粉状毕赤酵母介导的还原和玫瑰色红球菌介导的氧化的底物特异性。
Asymmetric reduction of trifluoromethyl ketones containing a sulfur functionality by the alcohol dehydrogenase from Geotrichum
The reduction of trifluoromethyl ketones containing a sulfur functionality by the crude alcohol dehydrogenase from Geotrichum proceeded successfully, and the corresponding optically active alcohols were synthesized with high yields and excellent enantioselectivities.
A five-step preparation of 2-benzoyloxy-3,3,3-trifluoropropanal from 1,2-epoxy-3,3,3-trifluoropropane via Pummerer rearrangement is described. The total yield of the aldehyde from the epoxide was 90%. The aldehyde kept its optical purity when it was in hydrate form, but it was found to readily racemize in its formyl form. The utilization of selenium instead of sulfur in these procedures offered advantages
Chemoenzymatic Cascades for the Enantioselective Synthesis of β‐Hydroxysulfides Bearing a Stereocentre at the C−O or C−S Bond by Ketoreductases
作者:Fei Zhao、Kate Lauder、Siyu Liu、James D. Finnigan、Simon B. R. Charnock、Simon J. Charnock、Daniele Castagnolo
DOI:10.1002/anie.202202363
日期:2022.8
Four ketoreductases (KREDs) were identified for the enantioselectivesynthesis of β-hydroxysulfides. KRED311 and KRED349 catalyse the synthesis of β-hydroxysulfides bearing a stereocentre at the C−Obond with opposite absolute configurations via chemoenzymaticcascades from thiophenols/thiols and α-haloketones/alcohols. KRED253 and KRED384 catalyse the synthesis of β-hydroxysulfides bearing a stereocentre