J. Trojánek
Czechoslovak Academy of Sciences
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Featured researches published by J. Trojánek.
Tetrahedron Letters | 1981
Josef Hajicek; J. Trojánek
Abstract Attempted transformation of readily accessible 18-methylenevincadifformine (I) to indolenine VI in acidic medium afforded unexpectedly the intramolecular [4+2] cycloadduct VIII in almost quantitative yield
Tetrahedron Letters | 1982
Josef Hajicek; J. Trojánek
Abstract The (−)-strempeliopine was assigned the absolute configuration depicted in I on the basis of its stereospecific synthesis from (+)-18-methylenevincadifformine (II).
Tetrahedron Letters | 1981
Josef Hajicek; J. Trojánek
Abstract The 18-methylene-1,2-dehydroaspidospermidine (III) was stereospecifically transformed into the schizozygane alkaloid strempeliopine (II) in 16,6 % overall yield.
Phytochemistry | 1989
Jaroslav Podlaha; Jana Podlahová; Jindřich Symerský; František Tureček; Vladimír Hanuš; Z. Koblicová; J. Trojánek; Jiří Slavík
Abstract The structure of roemeridine, the major alkaloid from Roemeria hybrida was established by X-ray crystallography. Structure-significant features of the 1H and 13C NMR spectral mass spectral fragmentations are reported.
Monatshefte Fur Chemie | 1985
Josef Hajicek; J. Trojánek
The pentacyclic lactams9,11, and14 were prepared using a thermal condensation of tryptamine with symmetrical oxodiesters3 and4 as the key step. The formation of the ring E in the tetracyclic compounds5,6,8,10,12, and13 is strongly dependent on the ring size.ZusammenfassungDie pentacyclischen Verbindungen9,11 und14 wurden durch thermische Kondensation von Tryptamin mit symmetrischen Oxodiestern3 und4 als wichtigster Reaktionsstufe dargestellt. Die Bildung des Ringes E in den tetracyclischen Verbindungen5,6,8,10,12 und13 ist stark von der Ringgröße abhängig.
Collection of Czechoslovak Chemical Communications | 1974
Karel Bláha; Z. Koblicová; J. Trojánek
Collection of Czechoslovak Chemical Communications | 1964
O. Štrouf; J. Trojánek
Tetrahedron Letters | 1961
J. Trojánek; O. Štrouf; J. Holubek; Z. Čekan
Collection of Czechoslovak Chemical Communications | 1986
Josef Hajicek; J. Trojánek
Tetrahedron Letters | 1972
Karel Bláha; Z. Koblicová; J. Trojánek