1,3-Dipolar cycloaddition synthesis of 3-bromo-5-substituted isoxazoles, useful intermediates for the preparation of pharmacologically active compounds
作者:D. Chiarino、M. Napoletano、A. Sala
DOI:10.1002/jhet.5570240109
日期:1987.1
monosubstituted acetylenic derivatives 4 to give 3-bromo-5-substituted isoxazoles 5 in high yield. The experimental conditions necessary to overcome difficulties such as the low reactivity of acetylenicdipolarophiles and the high tendency to dimerization of bromonitrile oxide 2, are discussed; the regioselectivity of this 1,3-dipolar cycloaddition is also studied. The obtained improvements in the synthesis of
PROCESS FOR THE PREPARATION OF 3,5-DISUBSTITUTED ISOXAZOLES
申请人:ZAMBON S.p.A.
公开号:EP0207955B1
公开(公告)日:1990-02-07
US4772719A
申请人:——
公开号:US4772719A
公开(公告)日:1988-09-20
[EN] PROCESS FOR THE PREPARATION OF 3,5-DISUBSTITUTED ISOXAZOLES
申请人:ZAMBON S.P.A.
公开号:WO1986003490A1
公开(公告)日:1986-06-19
(EN) Preparation of 3,5-disubstituted isoxazoles by reacting dichloro- or dibromoformaldoxime with an 1-alkyne derivative optionally followed by the conversion in accordance with conventional techniques of the substituents at 3- and 5-position. The 3,5-disubstituted isoxazoles are useful in various fields such as the pharmaceutical and agricultural field and also as intermediates.(FR) Préparation d'isoxazoles 3,5-disubstitués par réaction de dichloro- ou dibromoformaldoxime avec un dérivé de 1-alcyne, suivie éventuellement de la conversion, selon les techniques conventionnelles, des substituants en position 3 et 5. Les isoxazoles 3,5-disubstitués sont utiles dans divers domaines tels que les secteurs pharmaceutique et agricole et également en tant qu'intermédiaires.