Chemoenzymatic approaches to the synthesis of the (1S,2R)-isomer of benzyl 2-hydroxycyclohexanecarboxylate
作者:Ryuji Tsunekawa、Kengo Hanaya、Shuhei Higashibayashi、Mitsuru Shoji、Takeshi Sugai
DOI:10.1016/j.mcat.2017.10.036
日期:2018.1
was then substituted with a benzyl group with low volatility and increased hydrophobicity to facilitate the isolation of the expected product. Incubation with W. californica furnished benzyl (1S,2S)-2-hydroxycyclohexanecarboxylate (>99.9% ee) in 51.0% yield together with its (1R,2S)-isomer (>99.9% ee) in 35.4% yield. Upon treatment of the same substrate bearing the benzyl ester with a screening kit
我们检查了十株培养的全细胞酵母的不对称还原市售的2-氧代环己烷甲酸乙酯,发现2-羟基环己烷甲酸乙酯的(1 S,2 S)-立体异构体是由加利福尼亚州柳产JCM 3600产生的主要立体异构体然后用低挥发性和增加的疏水性的苄基取代酯的乙基,以促进预期产物的分离。与加利福尼亚州W. californica一起温育提供了苄基(1 S,2 S)-2-羟基环己烷羧酸酯(> 99.9%ee)及其收率(1 R,2 S)达到51.0%-异构体(> 99.9%ee),收率35.4%。处理后在同一基板轴承用纯化过表达的羰基还原酶的筛选试剂盒(大赛璐Chiralscreen苄基酯的® OH),两种酶(E031,E078)得到(1 - [R,2小号) -异构体为主要产物。与另一种酶(E007),所述(1小号,2 - [R ),得到异构体,但其ee值是非常低的(25.6%)。由W. californica获得的高度对映体富集的(1