The reaction of propargylic alcohols with diaryl disulfides and carbon monoxide in the presence of tetrakis(triphenylphosphine)palladium leads to a novel thiolative lactonization to afford beta-(arylthio)-alpha,beta-unsaturated lactones in moderate to good yields. Similar conditions can be employed with homopropargylic alcohols, giving the corresponding delta-lactones with a beta-arylthio group successfully
The regiochemistry of A-ring-labelled averufin incorporation into aflatoxin B1
作者:Craig A. Townsend、Steven G. Davis
DOI:10.1039/c39830001420
日期:——
A-Ring [13C]-labelled averufin has been synthesized and found to be incorporated intact into aflatoxin, B1, where the labelling pattern in the fused cyclopentenone unequivocally establishes the origin of the carbon backbone as consistent with current biogenetic theories.
Preparation and reactions of 3- and 4-tributylstannyl-2-(5H)-furanones: Preparation of aryl furanones
作者:Gregory J. Hollingworth、J.B. Sweeney
DOI:10.1016/s0040-4039(00)60930-9
日期:1992.11
3- and 4-trialkylstannylfuranones (2) and (3) have been prepared by an interesting desulphurative stannylation reaction; 3- and 4-substituted 2-(5H)-Furanones (12) and (13) may be prepared via palladium-catalysed cross coupling of (2) and (3) with aryl iodides
WATANABE, MIKIO;SHIRAI, KOZO;KUMAMOTO, TAKANOBU, J. CHEM. SOC. JAP., CHEM. AND IND. CHEM., 1982, N 11, 1780-1784