PUZICHA, GISBERT;SHROUT, DAVID P.;LIGHTNER, DAVID A., J. HETEROCYCL. CHEM., 27,(1990) N, C. 2117-2123
作者:PUZICHA, GISBERT、SHROUT, DAVID P.、LIGHTNER, DAVID A.
DOI:——
日期:——
Synthesis and properties of homomologated and contracted dipyrrinone analogs of xanthobilirubic acid
作者:Gisbert Puzicha、David P. Shrout、David A. Lightner
DOI:10.1002/jhet.5570270749
日期:1990.11
Dipyrrinoneanalogs of xanthobilirubicacid, 5-[1,5-didehydro-3-ethyl-4-methyl-5-oxo-2H-pyrrol-2-ylidene)-methyl]-2,4-dimethyl-1H-pyrrol-3-propanoic acid, with alkanoic acid chain lengths varying from formic to caproic have been synthesized as their methyl esters and characterized spectroscopically. All of the dipyrrinones studied exhibit intermolecular hydrogen bonding in chloroform, as detected by
An Efficient Synthesis of Symmetric Bilindiones. Mesobilirubin-Xlllα and Analogs with Varying Alkanoic Acid Chain Lengths
作者:David P. Shrout、Gisbert Puzicha、David A. Lightner
DOI:10.1055/s-1992-26102
日期:——
An inexpensive gram-scale, three-step procedure is described to convert methyl xanthobilirubinate and it alkanoic acid ester analogs (methyl 5-[(3-ethyl-1, 5-dihydro-4-methyl-5-oxo-2H-pyrrol-2-ylidene)methyl]-1, 4-dimethylpyrrol-3-ethanoate, -propanoate, -butanoate, -pentanoate, -hexanoate) into mesobilirubin-XIIIα and analogs in > 90% yield at each step.