One-Pot Transition-Metal-Free Synthesis of Weinreb Amides Directly from Carboxylic Acids
作者:Danfeng Huang、Yulai Hu、Teng Niu、Ke-Hu Wang、Changming Xu、Yingpeng Su、Ying Fu
DOI:10.1055/s-0033-1340317
日期:——
directly fromcarboxylicacids, N,O-dimethylhydroxylamine, and phosphorus trichloride in one pot at 60 °C in toluene in high yields, thus avoiding the separation of the moisture and air sensitive intermediate P[NMe(OMe)]3 in advance. Sterically hindered carboxylicacids also give the corresponding Weinreb amides in excellent yields. Various functional groups are tolerated on the carboxylicacid. The method
A Powerful Reagent for Synthesis of Weinreb Amides Directly from Carboxylic Acids
作者:Teng Niu、Weiming Zhang、Danfeng Huang、Changming Xu、Haifeng Wang、Yulai Hu
DOI:10.1021/ol901886u
日期:2009.10.1
A powerful reagent, P[NCH3(OCH3)](3) (3), for conversion of carboxylic acids directly to Weinreb amides was developed. In most cases the yields of the corresponding Weinreb amides were above 90% when P[NCH3(OCH3)13 was heated with aromatic and aliphatic carboxylic acids in toluene. The sterically hindered carboxylic acids can also give the corresponding Weinreb amides in excellent yields.
Highly diastereoselective synthesis of β-amino alcohols
作者:Wim J. N. Meester、Rudmer van Dijk、Jan H. van Maarseveen、Floris P. J. T. Rutjes、Pedro H. H. Hermkens、Henk Hiemstra
DOI:10.1039/b108254j
日期:2001.11.15
Several substituted β-amino alcohols 1 were synthesised in a diastereoselective manner via the novel highly versatile intermediate 8b, involving a combination of N-acyliminium ion and Weinreb amide chemistry.