The recently described pressure reaction in the presence of trithylamine with subsequent thermal (200°C) cyclization provided 13N-pyridylcantharidinimides 4a-4m from aminopyridines and cantharidin in yields of 15–83%. 2-Amino-3,5-dichloropyridine failed to yield 4n.
Über die absolute Konfiguration der Cantharsäure und des Palasonins
作者:Martin G. Peter、Günther Snatzke、Feliksa Snatzke、K. N. Nagarajan、Hans Schmid
DOI:10.1002/hlca.19740570106
日期:——
The absolute configurations of (+)-cantharic acid, a chiral derivative of the achiral insect defensive substance cantharidin (1), and of palasonin, a lower homologue of 1 occurring in the plant Butea frondosa, were shown to be represented by formulas 2 and 3, respectively (scheme 1). These results were obtained by application of the Horeau method (table 1) on the (+)-cantharic acid derivatives (+)-5