Highly efficient dehydrogenative cross-coupling of aldehydes with amines and alcohols
作者:Ramesh Deshidi、Masood Ahmad Rizvi、Bhahwal Ali Shah
DOI:10.1039/c5ra17425b
日期:——
A common protocol for the synthesis of amides, esters and α-ketoesters via cross dehydrogenative coupling of aldehydes and amines/alcohols has been developed.
通过醛和胺/醇的交叉脱氢偶联合成酰胺、酯和α-酮酯的常见协议已经开发出来。
Stereoselective Intramolecular Cyclization of Isopentenyl Benzamide via π-Allylpalladium Complex Catalyzed by Pd(0)
An efficient procedure was developed to synthesize oxazoline as key intermediate in the total synthesis of (+)-lactacystin using palladium(0)-catalyzed intramolecular cyclization of isopentenyl benzamide via a π-allylpalladiumcomplex. A convenient and efficient method was developed for the synthesis of the optically pure α-amino-β-hydroxy acid.
A Facile Synthesis of 2-Oxazolines via Dehydrative Cyclization Promoted by Triflic Acid
作者:Tao Yang、Chengjie Huang、Jingyang Jia、Fan Wu、Feng Ni
DOI:10.3390/molecules27249042
日期:——
oxazoline production. Herein, we report a triflicacid (TfOH)-promoted dehydrative cyclization of N-(2-hydroxyethyl)amides for synthesizing 2-oxazolines. This reaction tolerates various functional groups and generates water as the only byproduct. This method affords oxazoline with inversion of α-hydroxyl stereochemistry, suggesting that alcohol is activated as a leaving group under these conditions
Stereoselective Intramolecular Cyclization of Allyl and Homoallyl Benzamide via π-Allylpalladium Complex Catalyzed by Pd(0)
作者:Kee-Young Lee、Yong-Hyun Kim、Min-Sung Park、Chang-Young Oh、Won-Hun Ham
DOI:10.1021/jo991065r
日期:1999.12.1
The transformation of acyclic allylic benzamides 4 and homoallylic benzamides 12 to vinyl oxazolines 3 is achieved in the presence of base by the catalysis of Pd(0) in high yield and with high diastereoselectivity. Especially, in the case of homoallylic benzamides 12, trans-oxazolines 3 are formed exclusively or predominantly over cis-oxazolines 8, irrespective of the composition of their stereoisomers. The reaction is believed to proceed via the same pi-allylpalladium complex that arises from either primary or secondary allylic acetates. We applied this method to the syntheses of beta-amino-alpha-hydroxy acids 1 and gamma-amino-beta-hydroxy acids 2, conveniently protected as oxazoline.