Large-Scale Preparation of 2-Methyloxazole-4-carboxaldehyde
摘要:
The large-scale preparation of 2-methyloxazole-4-carboxaldehyde presents a significant challenge due to the physical characteristics of the molecule. A method for the preparation of 10-kg batches of 2-methyloxazole-4-carboxaldehyde is described. The key reaction is the reduction of the corresponding N-methoxy-N-methyl amide using lithium aluminium hydride, followed by workup and isolation by crystallization.
The 4-oxoalkyl- and 4-iminoalkyl-5-azidothiazoles undergo a ringtransformation with nitrogen loss at relatively low temperatures to afford 4-cyanooxazoles and 4-cyanoimidazoles, respectively. The mechanism, which is thought to involve a ring opening-ring closure process, is discussed.
1-Substituted Cyclopentylamines from Nitriles and Tetramethylenebismagnesium Dibromide in the Presence of Ti(O<i>i</i>Pr)<sub>4</sub>
作者:Olesya A. Tomashenko、Andrei E. Rudenko、Viktor V. Sokolov、Alexander A. Tomashevskiy、Armin de Meijere
DOI:10.1002/ejoc.200900817
日期:2010.3
Various 1-substitutedcyclopentylamines (25 examples, 10― 89 % yield) have been prepared according to a one-pot procedure by the addition of tetramethylenebismagnesiumdibromide in the presence of Ti(OiPr) 4 to aliphatic, aromatic and heteroaromatic nitriles, respectively.
The disclosure provides compounds of formula I, including their salts, as well as compositions and methods of using the compounds. The compounds have activity against hepatitis C virus (HCV) and may be useful in treating those infected with HCV.
The disclosure provides compounds of formula I, including their salts, as well as compositions and methods of using the compounds. The compounds have activity against hepatitis C virus (HCV) and may be useful in treating those infected with HCV.
The disclosure provides compounds of formula I, including their salts, as well as compositions and methods of using the compounds. The compounds have activity against hepatitis C virus (HCV) and may be useful in treating those infected with HCV.