Synthesis and Absolute Stereochemistry of Roseophilin
作者:Paul E. Harrington、Marcus A. Tius
DOI:10.1021/ja011242h
日期:2001.9.1
The enantiospecific total synthesis of natural roseophilin has been completed in 7.0% overall yield over 15 steps by means of an asymmetric cyclopentannelation. This establishes the absolute configuration of the natural product as 22R,23R. Cyclopentenone (+)-12 was prepared in 78% yield and 86% ee in the key step.
Traceless Chiral Auxiliaries for the Allene Ether Nazarov Cyclization
作者:April R. Banaag、Marcus A. Tius
DOI:10.1021/jo801503c
日期:2008.11.7
The key stereochemical factors that determine transfer of asymmetry from the chiral auxiliary to the cyclopentenone in the allene ether version of the Nazarov reaction have been elucidated. On the basis of the new insights into the mechanism, two highly effective chiral auxiliaries were designed and prepared.