Highly efficient and diastereoselective synthesis of 1,3-oxazolidines featuring a palladium-catalyzed cyclization reaction of 2-butene-1,4-diol derivatives and imines
A palladium-catalyzed protocol for effective synthesis of 1,3-oxazolidines has been reported. This method is featured by the high diastereoselectivity (dr up to >98/2) and using the readily available 2-butene-1,4-diol derivatives and imines as substrates.
Enantioselective Iridium-Catalyzed
Allylic Aminations of Allylic Carbonates with Functionalized Side
Chains. Asymmetric Total Synthesis of (<i>S</i>)-Vigabatrin
Iridium-catalyzedaminations of allylic carbonates containing a variety of O-functional groups have been explored. High degrees of regio- as well as enantioselectivity were achieved with diacylamides under salt-free conditions and with arylamines. The results allowed the antiepilepsy drug (S)-vigabatrin to be prepared via a very short route.
Catalytic Asymmetric Synthesis of Diketopiperazines by Intramolecular Tsuji–Trost Allylation
作者:Matteo Faltracco、Silvia Cotogno、Christophe M. L. Vande Velde、Eelco Ruijter
DOI:10.1021/acs.joc.9b01994
日期:2019.9.20
We report the intramolecular Tsuji–Trost reaction of Ugi adducts to give spiro-diketopiperazines in high yield and with high enantioselectivity. This approach allows the catalyticasymmetric construction of a broad range of these medicinally important heterocycles under mild conditions, in two steps from cheap, commercially available starting materials.