Highly Enantioselective Reduction of β,β-Disubstituted Aromatic Nitroalkenes Catalyzed by <i>Clostridium sporogenes</i>
作者:Anna Fryszkowska、Karl Fisher、John M. Gardiner、Gill M. Stephens
DOI:10.1021/jo800124v
日期:2008.6.1
This is the first report of the use of Clostridium sporogenes extracts for enantioselective reduction of C═C double bonds of β,β-disubstituted (1) and α,β-disubstituted nitroalkenes (3). Crude enzyme preparations reduced aryl derivatives 1a−e and 1h, in 35−86% yield with ≥97% ee. Reduction of (E)- and (Z)-isomers of 1c gave the same enantiomer of 2c (≥99% ee). In contrast, α,β-disubstituted nitroalkene
这是使用产孢梭菌提取物对映选择性还原 β,β-二取代 ( 1 ) 和 α,β-二取代硝基烯烃 ( 3 )的 C=C 双键的第一份报告。粗酶制剂减少芳基衍生物1a-e和1h,产率 35-86%,ee ≥97%。1c的 ( E )- 和 ( Z )- 异构体的还原得到相同的2c对映体(≥ 99% ee)。相比之下,α,β-二取代硝基烯烃3a是一种较差的底物,产生 ( S )- 4a低产率 (10-20%),ee (30-70% ee) 取决于 NADH 浓度。描述了硝基烯烃1库的有效合成。