A Pichia farinosa IAM 4682 mediated reduction of sulfur containing ketones afforded secondary alcohols 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 I
AM 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。