Selective reduction of aromatic azides in solution/solid-phase and resin cleavage by employing BF3·OEt2/EtSH. Preparation of DC-81
摘要:
An efficient method for the reduction of aromatic azides in both solution and solid-phase has been developed by employing (BF3OEt2)-O-./EtSH. This report also describes resin cleavage employing this reagent system. Further, this protocol has been utilized for the solution as well as the solid-phase synthesis of pyrrolo[2, 1-c][1,4]benzodiazepines, including the naturally occurring antibiotic DC-81 and fused [2,1-b]quinazolinones. (c) 2006 Elsevier Ltd. All rights reserved.
A selective and facile method for the reduction of aromatic azides to amines by employing borontrifluoride diethyl etherate and sodium iodide. This methodology has been applied towards the preparation of biologically important imine-containing pyrrolobenzodiazepines and their dilactams through intramolecular reductive-cyclization process. In this protocol the reagent systems are amenable for the generation
2-Hydroxypyrrolo[2,1-c][1,4]benzodiazepines were aromatised in refluxing thionyl chloride into 11-chloropyrrolo[2,1-c][1,4]benzodiazepines in high yield. This aromatic system is doubly reactive towards nucleophiles leading to rearranged products such as iminobenzoxazines and quinazolines.
2-羟基吡咯并[2,1- c ^ ] [1,4]苯并二氮杂类中在回流的亚硫酰氯为11个氯吡咯芳香烃[2,1- c ^ ] [1,4]高收率苯二氮。该芳族体系对亲核试剂具有双反应性,从而导致重排产物,如亚氨基苯并恶嗪和喹唑啉。
Microwave Assisted Synthesis of Pyrrolo[2,1-<i>c</i>][1,4]benzodiazepine-5,11-diones
作者:Ahmed Kamal、B. S. Narayan Reddy、G. Suresh Kumar Reddy
DOI:10.1055/s-1999-2812
日期:1999.8
Selective reduction of aromatic azides in solution/solid-phase and resin cleavage by employing BF3·OEt2/EtSH. Preparation of DC-81
An efficient method for the reduction of aromatic azides in both solution and solid-phase has been developed by employing (BF3OEt2)-O-./EtSH. This report also describes resin cleavage employing this reagent system. Further, this protocol has been utilized for the solution as well as the solid-phase synthesis of pyrrolo[2, 1-c][1,4]benzodiazepines, including the naturally occurring antibiotic DC-81 and fused [2,1-b]quinazolinones. (c) 2006 Elsevier Ltd. All rights reserved.