Add time:09/28/2019 Source:infona.pl
Construction of 3,9-diazaspiro[5.5]undecane derivatives can be easily achieved via intramolecular spirocyclization of 4-substituted pyridines. The reaction entails in situ activation of the pyridine ring with ethyl chloroformate followed by intramolecular addition of an attached β-dicarbonyl nucleophile in the presence of Ti(O i Pr) 4 .
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