(S)-Mandelate-Mediated Dynamic Kinetic Resolution of α-Bromo Esters for Asymmetric Syntheses of Aminoflavones, Dihydroquinoxalinones and Dihydrobenzoxazinones
作者:Yong Sun Park、Yoon Min Lee
DOI:10.3987/com-09-11700
日期:——
(S)-Mandelate-mediated dynamickineticresolution of α-bromoesters in nucleophilicsubstitution reaction has been investigated. Reactions of various aryl amine nucleophiles in the presence of TBAI and DIEA can provide the substitution products 2 and 7-19 up to 95% yield and 96:4 dr. Also, the simple procedure with spontaneous removal of the chiral auxiliary provides a practical protocol for asymmetric
Facile Preparation of Highly Enantioenriched 1,4-Benzothiazin-3-ones by the Substitution of α-Bromoacetate with 2-Aminothiophenol
作者:Yong Sun Park、Ji Su Lee、So Jeong Lee、Gun Hee Han
DOI:10.1055/a-2004-1529
日期:——
A simple and convenient approach for highly enantioenriched 2-substituted 1,4-benzothiazin-3-ones was developed via the nucleophilic substitution of α-bromoacetates derived from either l-threonate or l-serinate using 2-aminothiophenol and a subsequent facile lactamization.