Copper salt-catalyzed homo-coupling reaction of potassium alkynyltrifluoroborates: a simple and efficient synthesis of symmetrical 1,3-diynes
作者:Marcio W. Paixão、Minéia Weber、Antonio L. Braga、Juliano B. de Azeredo、Anna M. Deobald、Hélio A. Stefani
DOI:10.1016/j.tetlet.2008.02.083
日期:2008.4
The copper-catalyzed dimerization of alkynyltrifluoroborates proceeds readily with good yields. The homo-coupling reaction can be effected in DMSO, in the open air, using Cu(OAc)2 as catalyst in the absence of any other additives. A variety of functional groups are tolerated.
Ethynylbenzenoid metabolites of <i>Antrodia camphorata</i>: synthesis and inhibition of TNF expression
作者:Marco Buccini、Kathryn A. Punch、Belinda Kaskow、Gavin R. Flematti、Brian W. Skelton、Lawrence J. Abraham、Matthew J. Piggott
DOI:10.1039/c3ob42333f
日期:——
Antrocamphin A and B, and (±)-epi-antrodioxolanone have been synthesised from a common precursor. Antrocamphin A displays anti-inflammatory activity but is also cytotoxic.
Double [2,3] sigmatropic rearrangements of bis(propargyl sulfenates) to bis(allenic sulfoxides) and of bis(propargyl sulfinates) to bis(allenicsulfones) are shown to be a convenient and effective method for the preparation of conjugated diallene systems bearing two electron withdrawing trihalomethyl sulfoxide or sulfone substituents either on C-1 and C-6, or on C-3 and C-4. Such substituents are further