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Featured researches published by H.-P. Wessel.


Tetrahedron Letters | 1980

Syntheses of the chromomycinone side chain from carbohydrate precursors

Joachim Thiem; H.-P. Wessel

Abstract Appropriate dithiane derivatives of D-threo configuration were prepared starting with D-arabinose and D-galactose, respectively. Their dianions served for nucleophilic additions to model aldehydes, thus comprising syntheses of the complex side chain of chromomycinone. In contrast to former reports a trianion formation of a dithiane-blocked α,β-dihydroxy aldehyde could not be confirmed.


Zeitschrift für Naturforschung B | 1985

Synthesen von Emodinaldehyd [1] / Synthesis of Emodine Aldehyde [1]

Joachim Thiem; H.-P. Wessel

9 By chromium trioxide oxidation and subsequent acid hydrolysis triacetyl emodine (3) was transferred to the aldehyde in a two-step synthesis. In a more favourable sequence 3 was reacted to the bromomethyl derivative 4 and this solvolyzed to the citreoroseine derivative 5. A second NBS reaction gave 8 which after acid hydrolysis led to emodine aldehyde (9). This five-step process proceeded without chromatographic separation in 27% overall yield.


European Journal of Organic Chemistry | 1981

Untersuchungen über Derivate der D-Threose und zur Darstellung der Seitenkette von Olivin

Joachim Thiem; H.-P. Wessel


European Journal of Organic Chemistry | 1982

Reaktionen von Benzyliden-D-tetrosen

Joachim Thiem; H.-P. Wessel


European Journal of Organic Chemistry | 1983

Synthese des Tetrose-Bausteins der Chromomycinon-Seitenkette aus D-Galactose

Joachim Thiem; H.-P. Wessel


European Journal of Organic Chemistry | 1982

1,4‐Dithio‐β‐threofuranoside durch intramolekulare Cyclisierung aus Dithian‐Threosen

Joachim Thiem; H.-P. Wessel


ChemInform | 1985

SYNTHESIS OF EMODIN ALDEHYDE

Joachim Thiem; H.-P. Wessel


European Journal of Organic Chemistry | 1983

Untersuchungen zur Darstellung und chemie von Aureolsäure-Modellaglyconen

Joachim Thiem; H.-P. Wessel; Margit Werk; Karl-Heinz Klaska


Zeitschrift für Naturforschung. B, A journal of chemical sciences | 1985

Synthesen von Emodinaldehyd

Joachim Thiem; H.-P. Wessel


ChemInform | 1984

SYNTHESIS OF THE TETROSE SYNTHON OF THE CHROMOMYCINONE SIDE CHAIN FROM D-GALACTOSE

Joachim Thiem; H.-P. Wessel

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