Bis-Chlorodibutyltin Oxide as a New Reagent for a Mild, Versatile and Regioselective Ring-Opening of Epoxides
作者:Claudio J. Salomon
DOI:10.1055/s-2001-9727
日期:——
A convenient and efficient procedure for the ring-opening of epoxides by means of alcohols and bis-chlorodibutyltin oxide is described. The cleavage of the oxiranes is found to proceed regioselectively under mild reaction conditions. Thus, several haloalkanols, useful intermediates toward biological active molecules, are easily obtained in very good yields.
Cooperative Brønsted Acid-Type Organocatalysis: Alcoholysis of Styrene Oxides
作者:Torsten Weil、Mike Kotke、Christian M. Kleiner、Peter R. Schreiner
DOI:10.1021/ol800149y
日期:2008.4.1
We present a mild and efficient method for the completely regioselective alcoholysis of styrene oxides utilizing a cooperative Bronsted acid-type organocatalytic system comprised of mandelic acid (1 mol %) and N,N'-bis-[3,5-bis-(trifluoromethyl)phenyl]-thiourea (1 mol %). Various styrene oxides are readily transformed into their corresponding beta-alkoxy alcohols in good to excellent yields at full conversion. Simple aliphatic and sterically demanding, as well as unsaturated and acid-sensitive alcohols can be employed.