Imidazo[1,2-b]pyridazines. XXIII Some 5-Deaza Analogues. Syntheses of Some 2-Aryl-6-(chloro, methoxy or unsubstituted)-3- (variously substituted)imidazo[1,2-a]pyridines and Their Affinity for Central and Mitochondrial Benzodiazepine Receptor
Catalytic, enantioselective alkylations of N,O- and N, N-acetals and hemiacetals
作者:Dana Ferraris、Brandon Young、Travis Dudding、William J. Drury、Thomas Lectka
DOI:10.1016/s0040-4020(99)00450-0
日期:1999.7
We report the first examples of catalytic, enantioselective alkylation of N,O-acetals to produce useful amino acid derivatives 5 in high yield (73–93%) and enantioselectivity (70–96%). We have extended the utility of our reaction to include a simple one-pot procedure from readily available starting materials. We also provide several different N-based protecting groups that greatly increase the flexibility
METHOD OF SYNTHESIZING LEVOROTATORY P-HYDROXYPHENYLGLYCINE COMPOUNDS
申请人:Henan Newland Pharmaceutical Co., Ltd
公开号:US20140350295A1
公开(公告)日:2014-11-27
The present invention relates to the field of chemical synthesis, particularly to a method of synthesizing levorotatory p-hydroxyphenylglycine compounds, which eliminates the subsequent processes of resolution, racemization processings, etc., simplifies operational steps; and acids with small organic molecule are chosen as catalyst in the second step, which not only is conducive to the realization of a industrialized production, but also makes the ee value of the end products be 88.1˜98.0% by determining the catalyst, the reaction solvent, the reactive substance, the reaction temperature, and the reaction duration; non-aqueous solvent is used in the second step, to avoid the discharging of phenol-containing waste water, thus environmental pollution is reduced.
The Catalytic Synthesis of Carboniolamide: The Role of sp 3 Hybridized Oxygen
作者:Xu Cheng、Yi Zhang、Yuchi Dai、Guigen Li
DOI:10.1055/s-0034-1379101
日期:——
A catalytic synthesis of carboniolamide has been reported. The strategy was straightforward with aldehyde and amide as starting materials. The products can be isolated as precipitates from the reaction mixture. The factor that stabilizes the labile functionality of hemiaminal was elucidated as a sp(3) hybridized oxygen.
A direct route to 2-alkyl-4-carbethoxy-5-vinyloxazoles
作者:Jianmin Zhang、Marco A. Ciufolini
DOI:10.1016/j.tetlet.2010.06.130
日期:2010.9
The reaction of an alpha-chloroglycinate ester with the dimethylaluminum acetylide derivative of phenyl propargyl ether provides the corresponding 5-vinyloxazole in 40-50% yield. (C) 2010 Elsevier Ltd. All rights reserved.
A Practical Preparation of Ethyl<i>N</i>-Acyl-2-(dimethoxyphosphoryl)glycinate
作者:Feng Xu、Paul Devine
DOI:10.1021/op1000594
日期:2010.5.21
A practical, cost-effective preparation of ethyl N-acyl-2-(dimethoxyphosphoryl)glycinate has been developed. The two-step process achieved an 80% overall isolated yield.