Synthetic, Fungicidal Unsaturated-γ-lactones Attached to Furanosidic Systems. Configurational Determination by Nuclear Overhauser Effect1
作者:
A.P. Rauter,
M.J. Ferreira,
J. Font,
A. Virgili,
M. Figueredo,
J.A. Figueiredo,
M.I. Ismael,
T.L. Canda,
期刊:
Journal of Carbohydrate Chemistry
(Taylor Available online 1995)
卷期:
Volume 14,
issue 7
页码: 929-948
ISSN:0732-8303
年代: 1995
DOI:10.1080/07328309508005386
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Stereoselective synthesis of a butenolide sugar derivative was possible by reaction of the appropriate sugar epoxide with the dilithium salt of phenylselenoacetic acid, followed by oxidation of the α-phenylselenobutanolide obtained with hydrogen peroxide in the presence of catalytic amounts of acetic acid. On the other hand, synthesis of an exocyclic α,β-unsaturated lactone was accomplished by Reformatsky reaction on the appropriate sugar carbonyl groups with ethyl bromomethylacrylate and activated zinc, leading to the introduction of this ring at position 2 or 4 of a furanose ring. Nuclear Overhauser effect studies led to the unambiguous determination of the configuration of the new chiral centre formed by the Reformatsky reaction. The fungicidal efficacy of some unsaturated lactone sugar derivatives is given.
点击下载:
PDF (669KB)
返 回