Isolation, structural assignment and insecticidal activity of (−)-(1S,2R,3R,4S)-1,2-epoxy-1-methyl-4-(1-methylethyl)-cyclohex-3-yl acetate, a natural product from Minthostachys tomentosa
作者:Ángel Cantı́n、Cristina Lull、Jaime Primo、Miguel A. Miranda、Eduardo Primo-Yúfera
DOI:10.1016/s0957-4166(01)00094-5
日期:2001.3
(-)-(1S,2R,3R,4S)-1,2-Epoxy-1-methyl-4-(1-methylethyl)-cyclohex-3-yl acetate has previously been identified as the active compound of Minthostachys tomentosa responsible for the insecticidal activity against Oncopeltus fasciatus. Its structure was initially assigned on the basis of spectral data. In order to confirm the structure and to define the stereochemistry, stereoselective synthesis of its enantiomer, (+)-(1R,2S,3S,3R)-1,2-epoxy-1-methyl-4-(1-methylethyl)-cyclohex-3-yl acetate, starting from (R)-(-)piperitone, was carried out using a Sharpless reaction as the key step. The natural product is dextro-rotatory while the synthetic product is levo-rotatory. Measurements of insecticidal activities of the different steroisomers revealed that only the natural product is active. (C) 2001 Elsevier Science Ltd. All rights reserved.
(-)-(1S,2R,3R,4S)-1,2-环氧-1-甲基-4-(1-甲基乙基)-环己-3-基醋酸酯已被鉴定为保护植物 Against Oncopeltus fasciatus 的斑须蝇植株植物活性成分活性分子。其结构最初是基于光谱数据确定的。为了确认结构并确定立体化学,以 (R)-(-) 芥子酮为起始原料,通过使用Sharpless反应作为关键步骤,成功地进行了其对映体 (+)-(1R,2S,3S,4R)-1,2-环氧-1-甲基-4-(1-甲基乙基)-环己-3-基醋酸酯的立体选择性合成。天然产物是右旋的,而合成产物是左旋的。对不同立体异构体的杀虫活性的测量表明,只有天然产物是具有活性的。© 2001 Elsevier Science Ltd. 保留所有权利。