Benzotriazole-assisted synthesis of novel mannich bases from ketones and diverse aldehydes
作者:Alan R. Katritzky、Philip A. Harris
DOI:10.1016/s0040-4020(01)81378-8
日期:1990.1
β-amino ketones are prepared in moderate to good yields by the reaction of the lithiumenolates of cyclohexanone, acetophenone, α-tetralone and camphor with the readily available adducts from an aldehyde or ketone, an amine and benzotriazole. Some diastereoselectivity is observed when the benzotriazole adduct is derivedfrom benzaldehyde.
A New General Method for the Synthesis of Tertiary Propargylamines (<i>N,N</i>-Dialkyl-2-alkynamines)
作者:Alan R. Katritzky、John K. Gallos、Konstantina Yannakopoulou
DOI:10.1055/s-1989-27136
日期:——
A new method has been developed for the preparation of propargylamines, compounds of pharmaceutical interest. The method employs mild conditions, affords good overall yields, and is successfully applied even in cases where other methods fail.
作者:Alan R. Katritzky、Konstantina Yannakopoulou、Hengyuan Lang
DOI:10.1039/p29940001867
日期:——
Reactions of N-(α-benzotriazolylalkyl)-N,N-dialkylamines with the dialkylamine corresponding to the dialkylamino substituent afford symmetrical aminals in good yields. Treatment with other dialkylamines gives mixtures of the unsymmetrical and the two symmetrical aminals. Cross-over experiments of symmetrical aminals demonstrates interconversions involving iminium ions and that equilibria exist in the
A General Method for the Preparation of β-Aminoesters
作者:Alan R. Katritzky、Konstantina Yannakopoulou
DOI:10.1055/s-1989-27381
日期:——
3-Dialkylamino (3) and 3-benzyloxycarbonylamino (6) esters are prepared by the Reformatsky reaction of 1-dialkylamino-(1) and 1-benzyloxycarbonylamino-(5) 1-(1-benzotriazolyl)alkanes with ethyl 2-bromoalkanoates. Compounds 1 and 5 are obtained by the condensation of benzotriazole, an aldehyde, and a secondary amine or benzyl carbamate. The procedure can be performed by as a one-pot reaction from benzotriazole.