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
Oxidative Cyclization of Unsaturated Ketene Dithioacetals with Ceric Ammonium Nitrate to Form Bicyclic Lactones
摘要:
Ceric ammonium nitrate oxidizes unsaturated ketene dithioacetals in wet MeCN to give cation radicals that cyclize to tri-substituted double bonds and styrenes by cation-like cyclizations leading to cyclic cation radicals that are transformed by further oxidation, hydrolysis and cyclization to bicyclic lactones in moderate to good yield. (C) 2000 Elsevier Science Ltd. All rights reserved.
Enantioselective Synthesis of the Unnatural Enantiomers of the Fungal Sesquiterpenoids Acorenone and Trichoacorenol
作者:Nelson L. Brock、Jeroen S. Dickschat
DOI:10.1002/ejoc.201100688
日期:2011.9
spirocyclic sesquiterpenoids trichoacorenol, previously identified in Trichoderma koningii (Huang et al., 1995), and acorenone. A new enantioselective synthesis of the enantiomer of the natural spirocyclic sesquiterpene acorenone and the first enantioselective synthesis of the related compound ent-trichoacorenol have been completed by a chiral-pool approach starting from (+)-(R)-pulegone using ring-closing metathesis
Stereospecific synthesis of iridomyrmecin and related iridolactones
作者:J. Wolinsky、T. Gibson、D. Chan、H. Wolf
DOI:10.1016/0040-4020(65)80066-7
日期:1965.1
Stereospecific syntheses of 6 (I, II, XVI, XXV, XXVI and XXXII) out fo 8 of the possible iridolactones are described. The lactone IV, produced by lactonization of trans-pulegenic acid (III), was converted by LAH reduction and acetylation to 3-(α-hydroxyisopropyl)-2-acetoxymethyl-1-methylcyclopentane (cis-trans-V). Dehydration of V with refluxing acetic anhydride gave 2-acetoxy-methyl-3-isopropenyl
ACETALS OF NEPETALIC ACID AND METHOD OF PREPARATION
申请人:SCIALDONE MARK A.
公开号:US20090087387A1
公开(公告)日:2009-04-02
Disclosed are acetals of nepetalic acid. They may be prepared by reaction of an alcohol with nepetalic acid, and are useful as repellents for insects and arthropods, in addition to other uses.
US7776912B2
申请人:——
公开号:US7776912B2
公开(公告)日:2010-08-17
The aphid sex pheromone cyclopentanoids: Synthesis in the elucidation of structure and biosynthetic pathways
作者:Glenn W. Dawson、John A. Pickett、Diane W.M. Smiley
DOI:10.1016/0968-0896(96)00012-0
日期:1996.3
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