in 50 ml Aceton wurden mit 0,3 ml 3~ Salzsaure 4 Std. untcr Ruckfluss gekocht. Das Losungsmittel wurde im Vakuum weitgehend abgedampft. Nach Zusatz von Natriumhydrogencarbonat extrahierte man mit Chloroform. Der Chloroformauszug wurde ahgedampft und der Ruckstand mit Chloroform/Methanol = 5/1 dunnschichtchromatographisch gereinigt. Ausheute : 10 mg, die nicht kristallisierten, aher sich in allen anderen untersuchten Eigenschaften als identisch mit der in Versuch 13.1. beschriebenen Base erwiesen (UV.-, 1R.-, Massenspektrum, CR. und Rf-Werte; 1R.-Spektrum (CHC1,) : 3367, 1675, 1610). LITERATURVERZEICHNIS [l] H .Summary. The structure of panepoxydone (1) and some related products, produced by two species of Panus (basidiomycetes), are proposed on the basis of chemical transformations and physical measurements.The absolute configurations of the main products are deduced b y the interpretation of CD.studies and compared with those of the structurally related compounds epoxydone (lo), terreic acid (11) and terremutin (12).Die Gattung P a w s gehort zur Klasse der Basidiomyceten, Familie Agaricaleae, Unterfamilie Leukosporae. Unseres Wissens sind bisher keine antibiotisch oder cytostatisch wirksamen Metaboliten bei dieser Gattung gefunden worden.
The CD spectra of 48 colchicine alkaloids and of some of their derivatives were given. The effects of the substituents and of the basic skeleton on the chiroptical properties of the measured compounds were discussed.
SumrnavyThe absolute stereochemistry of trisporic acid C(1) is lS, 13R; the la-methyl, which is equatorial, is selectively labelled by [2-14C]mevalonate, and corresponding chirality at C-1 in [2-14C]mevalonate-labelled p-carotene is thereby indicated with implications for the stereochemistry of cyclization in ,&carotene biosynthesis.
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