5-(Trimethylstannyl)-2<i>H</i>-pyran-2-one and 3-(Trimethylstannyl)-2<i>H</i>-pyran-2-one: New 2<i>H</i>-Pyran-2-one Synthons
作者:Zhi Liu、Jerrold Meinwald
DOI:10.1021/jo951394t
日期:1996.1.1
5-(Trimethylstannyl)-2H-pyran-2-one (11) and 3-(trimethylstannyl)-2H-pyran-2-one (30), readily prepared from the corresponding bromo-2H-pyran-2-ones, undergo Pd(0)-catalyzed coupling reactions with a variety of enol triflates to give 5- and 3- substituted 2H-pyran-2-ones, respectively, This reaction is applicable to the enol triflates of 14 beta-hydroxy-17-ketosteroids, and therefore may prove useful in convergent syntheses of lucibufagins and bufadienolides.
Parkinson, Christopher J.; Pinhey, John T.; Stoermer, Martin J., Journal of the Chemical Society. Perkin transactions I, 1992, # 15, p. 1911 - 1915
作者:Parkinson, Christopher J.、Pinhey, John T.、Stoermer, Martin J.
DOI:——
日期:——
J. ORG. CHEM., 1986, 51, N 2, 277-279
作者:
DOI:——
日期:——
Prostaglandin endoperoxide H synthase biosynthesis inhibitors
申请人:Abbott Laboratories
公开号:US06307047B1
公开(公告)日:2001-10-23
The present invention describes pyridazinone compounds of formula I
which are cyclooxygenase (COX) inhibitors, and in particular, are selective inhibitors of cyclooxygenase-2 (COX-2). COX-2 is the inducible isoform associated with inflammation, as opposed to the constitutive isoform, cyclooxygenase-1 (COX-1) which is an important “housekeeping” enzyme in many tissues, including the gastrointestinal (GI) tract and the kidneys. The selectivity of these compounds for COX-2 minimizes the unwanted GI and renal side-effects seen with currently marketed non-steroidal anti-inflammatory drugs (NSAIDs).
Highly stereoselective palladium-catalyzed coupling reactions of captodative olefins acetylvinyl arenecarboxylates
作者:Lourdes Villar、Joseph P. Bullock、Matheen M. Khan、Arumugam Nagarajan、Roderick W. Bates、Simon G. Bott、Gerardo Zepeda、Francisco Delgado、Joaquin Tamariz
DOI:10.1016/0022-328x(96)06112-8
日期:1996.6
The palladium-catalyzedreaction of the captodative olefin 3-(p-nitrobenzoyloxy)-3-buten-2-one (1a) with aryl and vinylhalides gave coupled products 4-aryl- and 4-vinyl-3-(p-nitrobenzoyloxy)-3-buten-2-ones, 4 and 6 respectively, with high Z stereoselection. (Ph3P)2PdCl2 also catalyzed cross-coupling alkylation, phenylation and vinylation with trialkylorganostannanes and bromo olefin (Z)-4-bromo-3