作者:Anais Jolit、Cody F. Dickinson、Kei Kitamura、Patrick M. Walleser、Glenn P. A. Yap、Marcus A. Tius
DOI:10.1002/ejoc.201701117
日期:2017.11.2
The detailed account of an asymmetric Nazarovcyclization that leads to α-hydroxycyclopentenones bearing either vicinal, all-carbon atom quaternary centers, or vicinalquaternary and tertiary centers is described. The all-aliphatic examples represent the greatest challenge as the dienone starting materials are not activated toward cyclization by an aryl group. The rational design and optimization of
By using a combination of a chiral N‐triflyl phosphoramide and TiCl4 as the catalyst, a new process for asymmetric intramolecular hydroalkoxylation of unactivated alkenes was developed, producing various chiral tetrahydrofuran derivatives in 51%—99% yields with 30%—71% ee's.