β-(acylamino)acrylates has been developed, affording chiral β-amino acid derivatives with excellent yields (95–99% yield) and enantioselectivities (97–99% ee). With the Ni–Binapine system, high enantioselectivities (98–99% ee) have also been obtained in the hydrogenation of Z/E isomeric mixtures of β-alkyl and β-aryl β-(acylamino)acrylates. The synthesis of chiral β-amino acid derivatives on a gram scale has also
A facile synthesis of 2‐amino‐1,3‐oxazoles via CuI‐catalyzed oxidative cyclization of enamines and N,N‐dialkyl formamides has been developed. The reaction proceeds through an oxidative C−N bond formation, followed by an intramolecular C(sp2)−H bond functionalization/C−O cyclization in one pot. This protocol provides direct access to useful 2‐amino‐1,3‐oxazoles and features protecting‐group‐free nitrogen
Solvent-Controlled Synthesis of Thiocyanated Enaminones and 2-Aminothiazoles from Enaminones, KSCN, and NBS
作者:Xiyan Duan、Xiaojing Liu、Xiaodan Cuan、Lin Wang、Kun Liu、Huiyun Zhou、Xue Chen、Huimin Li、Junqin Wang
DOI:10.1021/acs.joc.9b01722
日期:2019.10.4
and simple solvent-controlled synthesis of thiocyanated enaminones and 2-aminothiazoles has been demonstrated from enaminones, potassium thiocyanate, and N-bromosuccinimide. This process features mild reaction conditions, simple and easy operation, short reaction time, and high yield and chemoselectivity and thereby provides an efficient protocol for the divergent synthesis of thiocyanated enaminones
[EN] E-ISOMERIC beta-AROMATIC OR HETEROAROMATIC SUBSTITUTED beta-ACYLAMINO-ACRYLATES AND METHODS OF PREPARING THE SAME<br/>[FR] DOLLAR G(B)-ACYLAMINO-ACRYLATES E-ISOMERES A SUBSTITUTION DOLLAR G(B)-AROMATIQUE OU HETEROAROMATIQUE ET LEUR PROCEDES DE PREPARATION
申请人:DSM IP ASSETS BV
公开号:WO2004011414A1
公开(公告)日:2004-02-05
E-isomeric ß-(hetero) aromatically substituted acylaminoacrylates are of great economic interest since with them, by means of hydration, precursors of appropriately substituted (ß-amino acids can be prepared and, by doing so, lead to higher enantio-selectivities than the corresponding Z-isomers. The invention describes novel E-isomeric R-aromatically or ß-heteroaromatically substituted ß-acylaminoacrylates of the general formula (I): in which R represents hydrogen or a substituted or unsubstituted alkyl or aromatic or heteroaromatic residue, and R' represents a substituted or unsubstituted aromatic or heteroaromatic residue, R' represents H, a substituted or unsubstituted alkyl or aromatic or heteroaromatic residue, and R'' represents H, a substituted or unsubstituted alkyl, acyl, aromatic or heteroaromatic residue. According to the invention, the compounds according to the general formula (I) are prepared by acylation at temperatures below the boiling point of the reaction mixture.