The stereochemistry and absolute configuration of the four deodarols and two deodarones derived from R-(+)-limonene is described. © 2002 Elsevier Science Ltd. All rights reserved.

The 1,3-dipolar cycloaddition of 3-nitro-2(1H)-quinolones with ester-stabilized azomethine ylides derived from sarcosine ester and various aromatic aldehydes has been investigated. structure stereochemistry cycloadducts were studied in detail by X-ray NMR spectroscopy methods.

A new compound with a peroxisomicine (dimeric hydroxyanthracenone type) structure was isolated from Karwinskia parvifolia and denominated peroxisomicine A4 (PA4). The stereochemistry of the stereogenic centers of this compound and the previously isolated peroxisomicine A3 (PA3, 3) was elucidated using CD, 13 C NMR and 1 H NMR spectra. Four peroxisomicine stereoisomers were cytotoxic to Chang an...

The title compound, C(14)H(19)NO(3), was obtained as one of the two isomers of a Sharpless asymmetric dihydroxy-lation reaction of (1S)-1-[(1R)-1-phenyl-ethyl]-4-vinyl-pyrrolidin-2-one. The absolute stereochemistry of this isomer was determined from the known stereochemistry (R) at the bridge C atom between the phenyl and pyrrolidine rings. The mol-ecules form one-dimensional tapes along the b ...

II. Structure Elucidation on Polyketide Antibiotics by Biosynthetic Means A. Elasnin B. Herbimycin C. Irumamycin D. Phthoramycin E. Aurantinin F. Xanthoquinodin III. Biosynthesis and Stereochemistry of Macrolide Antibiotics and Production of New Hybrid Macrolides and Polyketide A. Biosynthesis of the Aglycone Moiety in 16-Membered Macrolides, Leucomycins and Tylosin B. The Intact Incorporation ...