Rhazinilam a structurally relatively simple tetracyclic natural product exerts interesting anticancer activities in vitro, which are difficult to reproduce in vivo. Based on the findings accumulated during the synthetic efforts and on the known metabolic sensitivity towards oxidation and acids a modified structural analogue of rhazinilam is proposed. A novel convergent approach towards the heterocyclic
An unprecedented Pd-catalyzed cascade Wacker-Heck lactonization-cyclization sequence is reported. The process provides a facile approach to bi- and tricyclic spiranoid lactones in good yields. The reaction shows general substrate scope...
A class of novel aminotetralins is disclosed useful as 5-HT1D&agr; agonists.
一类新型氨基四环烯被披露为5-HT1D&agr;激动剂。
Total Synthesis of (+)-Asperolide C by Iridium-Catalyzed Enantioselective Polyene Cyclization
作者:Oliver F. Jeker、Alberto G. Kravina、Erick M. Carreira
DOI:10.1002/anie.201307187
日期:2013.11.11
Domino rings: A general synthetic entry into labdane‐type diterpenoids has been developed based on an iridium‐catalyzed enantioselective polyenecyclization cascade. The potential of this process is demonstrated in the first total synthesis of the tetranorlabdane diterpene asperolide C (PMB=p‐methoxybenzyl, TMS= trimethylsilyl).
Concise construction of the trans-fused 7/7/6/6 tetracyclic ether part of hemibrevetoxinB (1) was achieved by a convergent strategy based on coupling reaction of an acyl anion equivalent, reductive cyclization of an α,ε-dihydroxyketone, and introduction of a methyl group at the central ring junction by the Nicolaou method. The resultant tetracyclic ether was transformed into the known intermediate