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.