Flash vacuum pyrolysis of stabilised phosphorus ylides. Part 4. Stepwise construction of terminal 1, 3-diynes, conjugated diacetylenic esters and a triacetylenic ester
摘要:
Thirteen examples of stabilised alkynoyl ylides 6 have been prepared and are found, upon flash vacuum pyrolysis (FVP) at 500 degrees C, to undergo extrusion of Ph(3)PO to give the diacetylenic esters 7 in moderate yield. At 750 degrees C the same ylides afforded terminal 1.3-diynes 8 although often in poor yield. For R = 2-MeSC(6)H(4) both 7 and 8 undergo secondary loss of Me(.) and cyclisation to give 2-alkynylbenzothiophene derivatives 9 and 10 in low yield. The first example of an alkadiynoyl ylide 11 has been prepared and is converted by FVP at 500 degrees C into the triacetylenic ester 12.
Preparation of arylpropiolate esters from trichlorocyclopropenium cation and elaboration of the esters to unsymmetrical 1,4-pentadiyn-3-ones and unsymmetrical tellurapyranones
2,5-Diarylisothiazolone: novel inhibitors of cytokine-induced cartilage destruction
作者:Stephen W. Wright、Joseph J. Petraitis、Bruce Freimark、John V. Giannaras、Michael A. Pratta、Susan R. Sherk、Jean M. Williams、Ronald L. Magolda、Elizabeth C. Arner
DOI:10.1016/0968-0896(96)00053-3
日期:1996.6
A series of 2,5-diarylisothiazolones is reported that inhibit the IL-lp-induced breakdown of bovine nasal septum cartilage in an organ culture assay. The synthesis and preliminary SAR of these compounds are described. These compounds represent a novel, nonpeptide lead series approach to the mediation of the chronic cartilage breakdown associated with arthritic disease. These compounds are relatively resistant to reductive metabolism by liver microsomal preparations and appear to inhibit cartilage breakdown by interfering with the proteolytic activation of matrix metalloproteinases. Copyright (C) 1996 Elsevier Science Ltd
AITKEN, R. ALAN;SETH, SHIRLEV, SYNLETT.,(1990) N, C. 212-213
作者:AITKEN, R. ALAN、SETH, SHIRLEV
DOI:——
日期:——
Aitken R. Alan, Seth Shirley, J. Chem. Soc. Perkin Trans., (1994) N 17, S 2461-2466
作者:Aitken R. Alan, Seth Shirley
DOI:——
日期:——
WADSWORTH, D. H.;GEER, S. M.;DETTY, M. R., J. ORG. CHEM., 52,(1987) N 16, 3662-3668