A new mild method for the one-pot synthesis of pyridines
作者:Xin Xiong、Mark C Bagley、Krishna Chapaneri
DOI:10.1016/j.tetlet.2004.06.061
日期:2004.8
Polysubstituted pyridines are prepared in good yield and with total regiocontrol by the one-pot reaction of an alkynone, 1,3-dicarbonyl compound and ammonium acetate in alcoholic solvents. This new three-component heteroannulation reaction proceeds under mild conditions in the absence of an additional acid catalyst and has been used in the synthesis of dimethyl sulfomycinamate, the acidic methanolysis
One-Pot Multistep Bohlmann−Rahtz Heteroannulation Reactions: Synthesis of Dimethyl Sulfomycinamate
作者:Mark C. Bagley、Krishna Chapaneri、James W. Dale、Xin Xiong、Justin Bower
DOI:10.1021/jo048106q
日期:2005.2.1
The synthesis of dimethyl sulfomycinamate, the acidic methanolysis product of the sulfomycin family of thiopeptide antibiotics, from methyl 2-oxo-4-(trimethylsilyl)but-3-ynoate is achieved in a 2,3,6-trisubstituted pyridine synthesis that proceeds with total regiocontrol in 13 steps by the Bohlmann-Rahtz heteroannulation of a 1-(oxazol-4-yl)enamine or in 12 steps and 9% yield by three-component cyclocondensation with N-[3-oxo-3-(oxazol-4-yl)propanoyl]serine and ammonia in ethanol.
TROSCHUTZ, REINHARD;NIETSCH, KARL-HEINZ, CHEM.-ZTG., 114,(1990) N0, C. 321-322
作者:TROSCHUTZ, REINHARD、NIETSCH, KARL-HEINZ
DOI:——
日期:——
Facile Synthesis of 2-Methylnicotinonitrile through Degenerate Ring Transformation of Pyridinium Salts
Nucleophilic recyclization of pyridinium salts involving a CCN interchange ringtransformation for the synthesis of 2-methylnicotinonitrile derivatives was herein developed. 3-Aminocrotononitrile (3-ACN) produced in situ from CH3CN acted as a C-nucleophile, as well as the source of CH3 and CN groups, which was supported by isotope-labeling and control experiments.