Stagonospora cirsii是强烈的Cirsium的病原体,在这种有害杂草的叶子上引起坏死性病变。在液体培养中生长时,真菌会产生有毒代谢产物。分离出一种新的植物毒素,命名为staagonolide,并通过光谱法将其表征为(8R,9R)-8-羟基-7-氧代-9-丙基-5-壬烯-9-内酯。Stagonolide被证明是非宿主特异性但选择性的植物毒素。C. arvense的叶子最敏感,而番茄和胡椒(茄科)的叶子对苯二酚的敏感度较低,后者在5 x 10(-3)M的条件下比其他植物更易被检测到。在5 x 10(-6)M下测定的Stagonolide被证明是C. arvense和其他一些菊科植物幼苗中根系生长的强抑制剂。小麦和萝卜的幼苗生长受毒素的影响要小得多,黄瓜的幼苗对此不敏感。
activity of four aminocarbonyl group containing 'boomerang'-type ring-closing metathesis catalysts have been studied for ten-membered lactone and compared well with the Grubbs I and II as well as the Hoveyda-Grubbs catalysts. The activity was found to be superior to the above three ring-closing metathesis catalysts and suggesting novel stereoselective total syntheses of herbarumin I and stagonolide A.
已经研究了含有四个氨基羰基的“回旋镖”型闭环复分解催化剂对十元内酯的催化活性,并与 Grubbs I 和 II 以及 Hoveyda-Grubbs 催化剂进行了很好的比较。发现其活性优于上述三种闭环复分解催化剂,并提示了草本素 I 和 stagonolide A 的新型立体选择性全合成。
A Stereoselective Aldol Approach for the Total Synthesis of Herbarumin I and Stagonolide A
A stereoselectivetotal synthesis of phytotoxic compounds herbarumin I and stagonolide A has been achieved utilizing Crimmin’s protocol for non-Evans anti-aldol approach and a ring-closing olefin metathesis reaction as the key steps. macrolide - phytotoxic - Evans aldol - olefin metathesis
The chemo-enzymatic and covergent synthesis of stagonolide B and the synthesis of stagonolide A, a phytotoxic 10-membered lactone have been achieved starting from D-ribose with overall yields of 25% and 8.7%, respectively. The synthesis contained simple steps in developing three centers' key intermediates, namely the enzymatic (Novozyme-435) resolution of a propargylic alcohol followed by macrolactonization and RCM. (C) 2010 Elsevier Ltd. All rights reserved.
First stereoselective total synthesis of (−)-stagonolide A
The first stereoselective total synthesis of the nonenolide (-)-stagonolide A is described Olefin metathesis and epoxide opening reaction are the key steps involved. (c) 2009 Elsevier Ltd All rights reserved
Herbicidal Potential of Stagonolide, a New Phytotoxic Nonenolide from Stagonospora cirsii
Stagonospora cirsii is a pathogen of Cirsium arvense, causing necrotic lesions on leaves of this noxious weed. The fungus produced toxic metabolites when grown in liquid culture. A new phytotoxin, named stagonolide, was isolated and characterized as (8R,9R)-8-hydroxy-7-oxo-9-propyl-5-nonen-9-olide by spectroscopic methods. Stagonolide was shown to be a nonhost-specific but selective phytotoxin. Leaves
Stagonospora cirsii是强烈的Cirsium的病原体,在这种有害杂草的叶子上引起坏死性病变。在液体培养中生长时,真菌会产生有毒代谢产物。分离出一种新的植物毒素,命名为staagonolide,并通过光谱法将其表征为(8R,9R)-8-羟基-7-氧代-9-丙基-5-壬烯-9-内酯。Stagonolide被证明是非宿主特异性但选择性的植物毒素。C. arvense的叶子最敏感,而番茄和胡椒(茄科)的叶子对苯二酚的敏感度较低,后者在5 x 10(-3)M的条件下比其他植物更易被检测到。在5 x 10(-6)M下测定的Stagonolide被证明是C. arvense和其他一些菊科植物幼苗中根系生长的强抑制剂。小麦和萝卜的幼苗生长受毒素的影响要小得多,黄瓜的幼苗对此不敏感。