Enantioselective Trans Dihydroxylation of Nonactivated C−C Double Bonds of Aliphatic Heterocycles with <i>Sphingomonas</i> sp. HXN-200
作者:Dongliang Chang、Maarten F. Heringa、Bernard Witholt、Zhi Li
DOI:10.1021/jo034628e
日期:2003.10.1
4-dihydroxypiperidines 3 and 3,4-dihydroxypyrrolidines 6, respectively, with high enantioselectivity and high activity. The trans dihydroxylation was sequentially catalyzed by a monooxygenase and an epoxide hydrolase in the strain with epoxide as intermediate. While both epoxidation and hydrolysis steps contributed to the overall enantioselectivity in trans dihydroxylation of 1, the enantioselectivity in trans dihydroxylation
细菌菌株鞘氨醇单胞菌(Sphingomonas sp。)。HXN-200用于催化N-取代的1,2,5,6-四氢吡啶1和3-吡咯啉4的反二羟基化反应,从而分别以高对映体选择性得到相应的3,4-二羟基哌啶3和3,4-二羟基吡咯烷6。和高活动。在菌株中以环氧化物为中间体,通过单加氧酶和环氧化物水解酶顺序地催化反式二羟基化。尽管环氧化步骤和水解步骤都对1的反式二羟基化反应的总体对映选择性有所贡献,但对称底物4的反式二羟基化反应的对映选择性仅在中环氧化物5的水解中产生。生物产物(+)-3的绝对构型通过化学相关将(+)-6确定为(3R,4R)。用鞘氨醇单胞菌属物种的冷冻/解冻细胞制备1a和4b的反式二羟基化反应。HXN-200在96%ee和60%ee中分别提供了相应的(+)-(3R,4R)-3,4-二羟基哌啶3a和(+)-(3R,4R)-3,4-二羟基吡咯烷6b产率分别为80%。这些结果代表了用非萜底