Ring Expansion of 1,2,3,4-Tetrahydroisoquinolines to Dibenzo[<i>c,f</i>]azonines. An Unexpected [1,4]-Sigmatropic Rearrangement of Nitrile-Stabilized Ammonium Ylides
作者:Julio Cesar Orejarena Pacheco、Till Opatz
DOI:10.1021/jo500749x
日期:2014.6.6
When the products of a Strecker reaction of 1,2,3,4-tetrahydroisoquinolines with aromatic aldehydes are quaternized with alkyl triflates and subsequently treated with base, a ring expansion to 6,7,8,13-tetrahydro-5H-dibenzo[c,f]azonine-5-carbonitriles takes place. The nine-membered cyclic products can be obtained in good yields (78–89%) in a process involving the [1,4]-sigmatropic rearrangement of
当1,2,3,4-四氢异喹啉与芳族醛的斯特雷克反应产物用烷基三氟甲磺酸酯季铵化并随后用碱处理时,扩环成6,7,8,13-四氢-5 H-二苯并[ c,f ]氮杂5腈发生。在涉及腈稳定的内鎓盐的[1,4]-σ重排的过程中,九元环状产物可以以高收率获得(78-89%)。该反应顺序提供了一种新的,简单和有效的方法的这些不寻常的合成N -杂环。