Syntheses of oxazolo[4,5‐
<i>c</i>
]pyridine and 6‐azaindole
作者:Freddy Tjosaas、Ivar Broendbo Kjerstad、Anne Fiksdahl
DOI:10.1002/jhet.5570450240
日期:2008.3
The preparation of oxazolo[4,5-c]pyridine and 6-azaindole from 4-bromo-3-pivaloylaminopyridine (8) is reported. The oxazolopyridine 2-tert-butyl-oxazolo[4,5-c]pyridine (9) was successfully prepared from 8 in 78% yield by a new base/TBAB promoted non-catalyzed microwave cyclisation strategy (10 min) or, alternatively, in 54% yield by conventional heating (48 hrs) and CuI catalysis. The 6-azaindole
据报道由4-溴-3-新戊酰基氨基吡啶(8)制备恶唑并[4,5- c ]吡啶和6-氮杂吲哚。通过新的碱/ TBAB促进的非催化微波环化策略(10分钟)成功地从8制备了恶唑烷吡啶2-叔丁基-恶唑并[4,5- c ]吡啶(9),产率为78%。通过常规加热(48小时)和CuI催化可得到54%的收率。在两个步骤中,包括Sonogashira偶联反应,由8制备6-氮杂吲哚2-苯基-1-(三甲基乙酰基)-6-氮杂吲哚(13)。