Total synthesis and antifungal activity of 9-methoxystrobilurin L as the originally proposed 1,4-Benzodioxan structure
摘要:
Total synthesis of both enantiomers of 9-methoxystrobilurin L as the originally proposed 1,4-benzodioxan structure was successfully achieved. The H-1 and C-13 NMR spectra of synthesized 9-methoxystrobilurin L were compared with those of a naturally-occurring sample. lt was strongly indicated that naturally-occurring 9-methoxystrobilurin L has not the originally reported 1,4-benzodioxan structure but a 1,5-benzodioxepin structure, the same as previously reported 9-methoxystrobilurin K. Antifungal activities of the synthesized compounds toward several typical fungi were also examined, and they were less active than 9-methoxystrobilurin K. (C) 2001 Elsevier Science Ltd. All rights reserved.
Total synthesis of a potent antifungal and cytostatic 9-methoxystrobilurin A was achieved by developing a concise and general route to beta-methoxy acrylate. (C) 2000 Elsevier Science Ltd. All rights reserved.
Asymmetric total synthesis of a potent antifungal and cytostatic 9-methoxystrobilurin K was achieved by developing a convergent and versatile synthetic route.
9-Methoxystrobilurin-type beta-methoxyacrylate antibiotics (MOSBs) having various aromatic substructures were synthesized. The antifungal activity of the synthesized MOSBs against pathogenic and non-pathogenic fungi was examined, and the obtained results revealed that the antifungal activity of MOSBs was highly dependent on the aromatic substructures. However, no significant correlation was observed between cytotoxicity against human fibroblasts-like cell line and their structural properties. In addition, our results suggested that the strong growth-inhibitory activity of 9-methoxystrobilurin K against human-derived cell lines should be related to its hindered ether-type substructure. (C) 2002 Elsevier Science Ltd. All rights reserved.
A Novel Heterocycle-Stabilized Homoenolate Anion and Its Applications in the Syntheses of .beta.-Propenoylcarboxylic Esters, Cyclopropanecarboxylic Esters, 1-Vinyl-1-ethoxy Epoxides, and .gamma.-Lactones
作者:Alan R. Katritzky、Jinlong Jiang
DOI:10.1021/jo00106a003
日期:1995.1
N-(.alpha.-Ethoxyallyl)benzotriazole: A Novel Propenoyl Anion Synthon Route to Vinyl Ketones
作者:Alan R. Katritzky、Guifen Zhang、Jinlong Jiang
DOI:10.1021/jo00128a035
日期:1995.11
Lithiation with butyllithium of N-(alpha-ethoxyallyl)benzotriazole (2) (readily prepared in quantitative yield on a large scale from benzotriazole and acrolein diethyl acetal (9)) followed by reaction of lithio derivative 14 with halides, alpha,beta-unsaturated esters, alpha,beta-unsaturated ketones, and aldehydes gave exclusively alpha-alkylation adducts. These adducts are hydrolyzed under extremely mild conditions, enabling convenient syntheses of vinyl ketones 16 and functionalized vinyl ketones 21, 22, 24, and 27.
Katritzky Alan R., Jiang Jinlong, J. Org. Chem, 60 (1995) N 1, S 6-7