4,4'-Bi(cyclobutene-1,2-diones),一种衍生自方酸的新型化合物,此处命名为双方芳基,首次通过钯催化的(三正丁基甲锡烷基)环丁烯氧化二聚反应制备-1,2-二酮(提供对称取代的双四芳基)或通过钯-铜共催化的 3-取代-4-(三正丁基甲锡烷基)-3-环丁烯-1,2-二酮与 3-卤素的交叉偶联-4-取代-3-环丁烯-1,2-二酮(提供不对称取代双四芳基的途径)。新的母体双方酸是一种非常强的布朗斯台德酸,显然在溶解时完全电离;仅观察到一个 pK a 值 (pK a = -4.49)
A new process for the regiocontrolled synthesis of substituted catechols and other 1,2-dioxygenated aromatics: conjugate addition of vinyl-, aryl-, and heteroarylcopper reagents to cyclobutenediones followed by thermal rearrangement
作者:Angela Gurski、Lanny S. Liebskind
DOI:10.1021/ja00067a027
日期:1993.7
A general method for the synthesis of substituted catechol derivatives has been developed utilizing the 1,4-addition of vinyl-, aryl-, and heteroarylcuprates to cyclobutendiones followed by thermal rearrangement. In situ protection with (methoxyethoxy)methyl chloride of the enolate derived from addition of the cuprate yields 2-alkoxy-4-R unsat'd -2-cyclobutenones, which rearrange thermally to substituted
Bisaryl cyclobutenes derivatives as cyclooxygenase inhibitors
申请人:Merck Frosst Canada, Inc.
公开号:US05817700A1
公开(公告)日:1998-10-06
The invention encompasses the novel compound of Formula I useful in the treatment of cyclooxygenase-2 mediated diseases. ##STR1## The invention also encompasses certain pharmaceutical compositions for treatment of cyclooxygenase-2 mediated diseases comprising compounds of Formula I.
A synthesis of highly substituted aromatics through regiocontrolled construction of cyclobutenones bearing unsaturated substituents at the 4-position
作者:Damian J. Krysan、Angela Gurski、Lanny S. Liebeskind
DOI:10.1021/ja00030a043
日期:1992.2
2,3-Substituted 4-chloro-2-cyclobutenones, prepared by regiospecific transformations of substituted cyclobutenediones, undergo palladium-catalyzed cross-coupling with vinyl- and arylstannanes and vinylzirconium reagents to form 4-R unsat -2-cyclobutenones. On thermolysis (100 o C), these substrates transform into substituted phenols in high yield. A pentasubstituted aromatic and a variety of tri- and
2,3-取代的 4-氯-2-环丁烯酮,由取代的环丁烯二酮的区域特异性转化制备,经过钯催化与乙烯基和芳基锡烷以及乙烯基锆试剂交叉偶联,形成 4-R unsat -2-环丁烯酮。在热解 (100 o C) 时,这些底物以高产率转化为取代的苯酚。使用这种化学方法以区域特异性方式制备了五取代的芳香族化合物和各种三取代和四取代的芳香族化合物
BISARYLCYCLOBUTENE DERIVATES AS CYCLOOXYGENASE INHIBITORS
申请人:Merck Frosst Canada & Co.
公开号:EP0889878B1
公开(公告)日:2002-09-04
LIEBESKIND, LANNY S.;WIRTZ, KEVIN R., J. ORG. CHEM., 55,(1990) N9, C. 5350-5358