A new synthesis of β-keto amides by reduction of Passerini adducts
摘要:
The Passerini reaction between glyoxals, isocyanides and acetic acid forms beta-keto acyloxyamides, which are readily transformed in beta-keto amides by reductive deacetoxylation with zinc. The versatility of this procedure, which allows introducing different groups both in position-3 and the amide nitrogen, makes it ideal for its use in diversity-oriented synthesis. in combination with subsequent complexity generation reactions. (C) 2004 Elsevier Ltd. All rights reserved.
High-valent chiral oxidovanadium(V) complexes derived from 3,5-substituted-N-salicylidene-l-tert-leucine were used as catalysts in asymmetric reduction of N-benzyl-β-ketoamides. Among six different solvents, three different alcohol additives, and two different boranes examined, the use of pinacolborane in tetrahydrofuran (THF) with a t-BuOH additive led to the best results at -20 °C. The corresponding
Highly selective synthesis of functionalized polyhydroisoquinoline derivatives via a three-component domino reaction
作者:Xian Feng、Jian-Jun Wang、Zhan Xun、Juan-Juan Zhang、Zhi-Bin Huang、Da-Qing Shi
DOI:10.1039/c4cc08900f
日期:——
have been synthesized via the three-component domino reaction of glutaraldehyde and malononitrile with a series of beta-ketoamides under microwave irradiation conditions in the presence of a catalytic amount of Et3N (10 mol%). This reaction represents the first reported process for the facile conversion of a beta-ketoamide to a hydroisoquinoline via a C-N bond cleavage reaction without the need for