Catalytic Enantioselective Nazarov Cyclization: Construction of Vicinal All-Carbon-Atom Quaternary Stereocenters
作者:Anais Jolit、Patrick M. Walleser、Glenn P. A. Yap、Marcus A. Tius
DOI:10.1002/anie.201403587
日期:2014.6.10
The diastereoselective asymmetric synthesis of vicinal all‐carbon‐atom quaternarystereocenters is a challenging problem in organic synthesis for which only few solutions have been described. A catalytic asymmetric Nazarovcyclization of fully substituted dienones that provides cyclopentenone derivatives with vicinalquaternarystereocenters in high optical purity and as single diastereoisomers is
Solvent effects on the side selectivity of singlet oxygen with α,β unsaturated esters. New evidence for a perepoxide intermediate.
作者:Michael Orfanopoulos、Manolis Stratakis
DOI:10.1016/0040-4039(91)80509-5
日期:1991.12
The side selectivity of the ene reaction of singletoxygen with α, β-unsaturated esters depends on solvent polarity. These results are consonant with the formation of a perepoxide intermediate in the limiting step, of the title reaction.