Tetrahydro-1,5-benzoxazepines and tetrahydro-1<i>H</i>-1,5-benzodiazepines by a tandem reduction-reductive amination reaction
作者:Richard A. Bunce、Christopher L. Smith、Jason R. Lewis
DOI:10.1002/jhet.5570410617
日期:2004.11
A tandem reduction-reductive amination reaction has been applied to the synthesis of (±)-4-alkyl-2,3,4,5-tetrahydro-1,5-benzoxazepines and (±)-4-alkyl-1-benzoyl-2,3,4,5-tetrahydro-1H-1,5-benzodiazepines. The nitro aldehydes and ketones required for 1,5-benzoxazepine ring closures were prepared by nucleophilic aromatic substitution of the alkoxides from several 3-buten-1-ol derivatives with 2-fluoro-1-nitrobenzene
串联还原-还原胺化反应已用于合成(±)-4-烷基-2,3,4,5-四氢-1,5-苯并x氮平和(±)-4-烷基-1-苯甲酰基- 2,3,4,5-四氢-1 H -1,5-苯并二氮杂s。通过用2-氟-1-硝基苯将几种3-丁烯-1-醇衍生物中的醇盐进行亲核芳族取代,然后进行臭氧分解,可制备1,5-苯并x杂庚环闭环所需的硝基醛和酮。1,5-苯并二氮杂卓的前体是通过类似地添加N来制备的-(3-丁烯基)苯甲酰胺阴离子生成2-氟-1-硝基苯,然后进行臭氧分解。然后使用5%钯碳的甲醇溶液催化硝基羰基化合物的加氢反应,然后通过串联还原-还原胺化顺序得到目标杂环。色谱纯化后,高产率地分离出1,5-苯并x氮平。直接从氢化混合物中分离出固体形式的1,5-苯并二氮杂并在两个氮原子上具有不同的官能度。