Regioselective aminoethylation of 1,4-benzodiazepin-2-one under conventional heating and microwave irradiation
摘要:
The regioselective aminoethylation of 1,4-benzodiazepin-2-one 1 can be carried out using classical heating or microwave irradiation as the source of energy to furnish either N-1 or N-4 aminoethylated products 2a-d and 3a-d, respectively. The regio-selectivity observed has been rationalized using computational studies and has been traced to the disparity of the rate-determining steps along the N-1 product (N-1 PR) and N-4 product (N-4 PR) formation pathways. (c) 2006 Elsevier Ltd. All rights reserved.
A Convenient Two-Step Synthesis of Amino Acid Derived Chiral 3-Substituted [1,4]Benzodiazepin-2-ones
作者:Gautam Panda、Jitendra Kumar Mishra
DOI:10.1055/s-2005-869950
日期:——
A new two-step route to chiral 3-substituted [1,4]benzo-diazepin-2-ones is described, which involves the coupling of 2-nitrobenzyl bromide with a series of aminoacids, followed by diazepine ring formation with Fe/AcOH at110 °C.
A novel protocol for the facile synthesis of chiral 3-substituted 1,3,4,5-tetrahydrobenzo[e][1,4]diazepin-2-ones via a domino reaction has been developed, which involves a cascade of SN2 nucleophilic substitution and copper-catalyzed CN coupling reactions of α-amino acid amides and ortho-halobenzyl halides. This protocol has some merits, such as one-pot process, easy operation, a wide scope of substrates
已开发了一种通过多米诺反应容易地合成手性3-取代的1,3,4,5-四氢苯并[ e ] [1,4]二氮杂-2-酮的新方法,该方法涉及级联的S N 2 α-氨基酸酰胺与邻卤代苄基卤化物的亲核取代和铜催化的CN偶联反应 该协议具有一些优点,例如一锅法,易于操作,基板范围广。此外,在反应过程中没有发生严重的外消旋作用。