137406-90-7Relevant academic research and scientific papers
The synthesis of pyrroles and dihydropyrroles by 1,3-dipolar cyclisations of N-arylmethylene[(benzotriazol-1-yl)arylmethyl]amines
Katritzky,Hitchings,Zhao
, p. 863 - 867 (2007/10/02)
N-Arylmethylene[(benzotriazol-1-yl)arylmethyl]amines 1 are prepared by the reaction of arylaldehydes, benzotriazole, and ammonia in dry ethanol. Deprotonation of these imines with butyllithium yields N-lithiated azomethine ylides 2 which readily undergo 1,3-dipolar cycloaddition with a large range of dipolarophiles. The cyclisations are regiospecific and generally exhibit high stereoselectivity. Benzotriazolate is eliminated during the course of the reaction, and the method thereby provides a route to 2,5-diaryl substituted pyrroles, 3,4-dihydro-2H-pyrroles and c-ring fused 3,4-dihydro-2H-pyrroles.
Convenient preparations of imines and symmetrical secondary amines possessing primary or secondary alkyl groups
Katritzky,Zhao,Hitchings
, p. 703 - 708 (2007/10/02)
Hindered alkyl aldehydes react with benzotriazole and ammonia in dry ethanol or methanol to yield the corresponding bis[1-(benzotriazol-1-yl)alkyl]amines 2. The reaction of aryl aldehydes, however, yields 1-(benzotriazol-1-yl)-N-alkylidenealkylamines 3. The reactions of adducts 2 and 3 with lithium aluminum hydride furnishes dialkyl- and dibenzylamine derivatives 4. Although the reactions of 2 and 3 with organometallic reagents are not as general, in several cases the reactions of amines 2 with Grignard reagents yield 1-alkyl or aryl substituted N-alkylidenealkylamines 5. Similar reactions of amines 2 with phenyl lithium afford 1,1'-diphenyldialkylamines 7.
