作者:Albert G. Armour、G. Büchi、A. Eschenmoser、A. Storni
DOI:10.1002/hlca.19590420652
日期:——
a) Es ist eine Reaktionsfolge entwickelt worden, welche in einem Zuge die Darstellung sämtlicher Struktur- und stereoisomeren Ambrinole [Δ8(bzw. Δ9 und Δ1,9)–2,5,5-Trimethyl-2-hydroxy-octaline] erlaubt.
Synthesis of Natural (−)-Antrocin and Its Enantiomer via Stereoselective Aldol Reaction
作者:Venkatachalam Angamuthu、Dar-Fu Tai
DOI:10.3390/molecules25040831
日期:——
The total synthesis of (−)-antrocin and itsenantiomer are presented. Antrocin (−)-1 is an important natural product which acts as an antiproliferative agent in a metastatic breast cancer cell line (IC50: 0.6 μM). The key features of this synthesis are: (a) selective anti-addition of trimethylsilyl cyanide (TMSCN) to α,β-unsaturated ketone; (b) resolution of (±)-7 using chiral auxiliary L-dimethyl
The present invention relates to a process of preparation of optically active antrocin. At first, to introduce the correct configuration of trans-decalone, alkyl aluminum/TMSCN was used to react with decalenone. The resulting racemic nitrile-decalone was resolved with chiral diol by ketalization to produce two chromatography separable diasteromers. After a simple column chromatography, optically pure compounds were obtained. Formylation was a critical step for the lactone formation. The rest of the synthesis is straight forward through oxidation and olefination. Accordingly, the total synthesis was completed in 10 steps with 7% overall yield from commercially available 6-methoxy-2-tetralone.
AbstractThe synthesis of racemic stereoisomeric compounds with the 5,5,9‐trimethyldecalin skeleton and an oxygen function at C(1), C(2), or C(3) is describedAlthough racemic decalins are described, only the enantiomer related to steroids is drawn. The projection of the decalins was chosen so as to place the angular methyl group above the plane of the molecule and the oxygen function at C(1), C(2) or C(3) on the left side, as represented by formula 1–6. The relative configuration of the substituents in decalins is designated by using the convention of the steroid series: β, meaning on the same side as the angular methyl group at C(9) and α, meaning on the side opposite from the angular methyl group. The prefix cis or trans refers to the fusion of the decalin ring system, not to the position of the substituents.
. A novel general one‐step synthesis of 2‐decalones by means of acid catalyzed cyclization of acyclic or monocyclic precursors has been developed.
Zur Kenntnis der Triterpene. 124. Mitteilung. Synthese des Δ<sup>5,10</sup>-1,1-Dimethyl-octalons-(6), eines Abbauproduktes des Ambreïns