The aphid sex pheromone cyclopentanoids: Synthesis in the elucidation of structure and biosynthetic pathways
摘要:
Identification of a range of aphid sex pheromones as comprising the cyclopentanoids (4aS,7S,7aR)-nepetalactune, (1R,4aS,7S,7aR)-nepetalactol and the (1S)- and (1R,4aR,7S,7aS)-nepetalactols required samples authenticated by H-1 and C-13 NMR. These and related compounds were provided by small scale synthesis and extraction from plants in the genus Nepeta (Lamiaceae). The subsequent discovery that the synthetic sex pheromones could attract males, and also parasitic wasps that attack aphids, has created a need for large scale syntheses of the cyclopentanoids. This is afforded by cyclisation of the 8-oxo-1-enamine of citronellal as originally developed by Schreiber and co-workers (1986). Investigation into the biosynthesis of the cyclopentanoids by plants for exploiting aphid sex pheromones in crop protection by means of molecular biology required synthesis of putative biosynthetic intermediates, some with radioactive isotopic labelling, particularly 8-oxidised monoterpene alcohols and aldehydes. Copyright (C) 1996 Elsevier Science Ltd
Selective epoxidation of monoterpenes with methyltrioxorhenium and H2O2
作者:Aída L.P. de Villa、Dirk E. De Vos、Consuelo C. de Montes、Pierre A. Jacobs
DOI:10.1016/s0040-4039(98)01853-x
日期:1998.11
terpenes such as α-pinene with H2O2 with minimal rearrangement of the epoxide. Pyridine is also critical to suppress isomerisation of the olefin substrate (in case of nerol, geraniol). The reaction can be directed towards selective single or double epoxidation, or in one step towards the rearranged product (e.g. from linalool to the ring-closure product linalool oxide).
在吡啶作为助催化剂的存在下,CH 3 ReO 3以最小的环氧基重排催化H 2 O 2对萜烯(如α-pine烯)的环氧化。吡啶对于抑制烯烃底物的异构化也是至关重要的(如果是神经醇,香叶醇)。该反应可以针对选择性的单或双环氧化,或在一步中针对重排的产物(例如从芳樟醇到闭环产物芳樟醇氧化物)。
Stereospecific, regioselective, and catalytic monoepoxidation of polyolefins by the use of a P-450 model, dihydrogen-dioxygen-TPP.cntdot.Mn-colloidal platinum
作者:Iwao Tabushi、Kozo Morimitsu
DOI:10.1021/ja00334a083
日期:1984.10
Etude de la monoepoxydation du nerol, du geranial et des acetates de neryle, geranyle et linalyle
橙花单环氧化练习曲、香叶与醋酸酯、香叶与里那利的练习曲
A useful propionate cofactor enhancing activity for organic solvent-tolerant recombinant metal-free bromoperoxidase (perhydrolase) from Streptomyces aureofaciens
作者:Hideyasu China、Hiroyasu Ogino
DOI:10.1016/j.bbrc.2019.06.036
日期:2019.8
The oxidative brominating activity of an organic solvent-tolerant recombinant metal-free bromoperoxidase BPO-A1 with C-terminal His-tag (rBPO-A1), from Streptomyces aureofaciens found to depend on various additives. These included carboxylic acids, used as cofactors and alcohols, used as water-miscible organic solvents. Enzyme activity was significantly enhanced by using propanoic acid (PA) as a cofactor
Oxidation of acyclic monoterpenes by P450 BM-3 monooxygenase: influence of the substrate E/Z-isomerism on enzyme chemo- and regioselectivity
作者:Yomi Watanabe、Sabine Laschat、Michael Budde、Olena Affolter、Yuji Shimada、Vlada B. Urlacher
DOI:10.1016/j.tet.2007.06.104
日期:2007.9
terpenoids are highly valuable compounds for organic chemistry. Cytochrome P450 monooxygenase P450 BM-3 from Bacillus megaterium is able to catalyzeoxidation of terpenes with high efficiency. Mutations at the amino acid positions 47, 51, and 87 resulted in significantly enhanced activity and regioselectivity of the enzyme during oxidation of geranylacetone and related compounds. The activity of the mutant
Oxidations with hydrogen peroxide catalysed by the [WZnMn(II)2(ZnW9O34)2]12− polyoxometalate
作者:Ronny Neumann、David Juwiler
DOI:10.1016/0040-4020(96)00419-x
日期:1996.6
Polyoxometalates can be used as catalysts for the activation of molecular oxygen and 30% aqueous hydrogenperoxide for the selective transformation of various organicsubstrates. In this paper results are presented for the oxidation of alkenes, dienes, alkenols, and sulfides using 30% aqueous H2O2 as oxidant and [WZnMn(II)2(ZnW9O34)2]12− as catalyst. In certain but not all cases high reactivity, chemoselectivity
多金属氧酸盐可用作催化剂,用于活化分子氧和30%的过氧化氢水溶液,用于各种有机底物的选择性转化。本文介绍了使用30%的H 2 O 2水溶液作为氧化剂和[WZnMn(II)2(ZnW 9 O 34)2 ] 12-作为催化剂氧化烯烃,二烯,烯醇和硫化物的结果。在某些但不是全部情况下,特别是在具有伯羟基单元的烯醇的环氧化中,已观察到高反应性,化学选择性和立体特异性。