Furan ring opening–indole ring closure: recyclization of 2-(2-aminophenyl)furans into 2-(2-oxoalkyl)indoles
作者:Arkady S. Pilipenko、Vladimir V. Mel’chin、Igor V. Trushkov、Dmitry A. Cheshkov、Alexander V. Butin
DOI:10.1016/j.tet.2011.10.114
日期:2012.1
The acid-catalyzed rearrangement of 5-alkyl-2-[2-(sulfonylamino)phenyl]furans into 2-(2-oxoalkyl)indoles is described. When the N-sulfonyl group in the starting compounds was displaced by an N-acyl group, the corresponding indoles were not formed under the same reaction conditions due to the in situ indole deacylation and decomposition. The presence of an alkyl group at the C5 position of the furan
描述了5-烷基-2- [2-(磺酰基氨基)苯基]呋喃的酸催化重排成2-(2-氧代烷基)吲哚。当起始化合物中的N-磺酰基被N-酰基取代时,由于原位吲哚脱酰基和分解,在相同的反应条件下没有形成相应的吲哚。呋喃环的C 5位上烷基的存在对于该方法的效率也是至关重要的。所讨论的重排为2-(2-氧代烷基)吲哚提供了一种简单而有效的方法。