An exclusive one step synthesis of dihydropyridin-2-imines 2 or 3, both of which are potent inhibitors of inducible nitric oxide (iNOS), from the common starting material 2-aminopyridine 1 was successfully carried out using the Birch reduction followed by the appropriate work-up procedure. The application of this reduction to other substituted 2-aminopyridines 4-8 and 2-hydroxypyridine 9 are reported. The reaction mechanism is also discussed.
A new and simple method for the synthesis of highly functionalised pyrrolizidines, indolizidines and pyrroloazepines
作者:Paul A. O’Gorman、Ting Chen、Hannah E. Cross、Saleena Naeem、Arnaud Pitard、M. Ilyas Qamar、Karl Hemming
DOI:10.1016/j.tetlet.2008.08.061
日期:2008.10
The reaction of 5-, 6- and 7-membered cyclic thioimidates with cyclopropenones gives access to highly functionalised pyrrolizidines, indolizidines and pyrroloazepines via a formal [3+2] cycloaddition process.
A compound represented by formula (I): ##STR1## wherein all symbols are defined in the specification, or an acid addition salt thereof or a hydrate thereof; a process for preparing the same; and a nitrogen monoxide synthase inhibitor comprising the same as an active ingredient.