Synthesis of tetrahydroisoquinolines via intramolecular electrophilic aromatic substitution reactions of Pummerer-derived substituted N-benzyl-N-tosyl-α-aminothionium ions
作者:Donald Craig、Kevin Daniels、A.Roderick MacKenzie
DOI:10.1016/s0040-4020(01)80458-0
日期:1992.1
addition to (phenylsulfinyl)ethene 1 of substituted benzylic amines 2 followed by N-tosylation gives substituted N-benzyl-N-tosyl-2-amino-1-(phenylsulfinyl)ethanes 3. Treatment of 3 with trimethylsilyl trifluoromethanesulfonate-Hünig's base gives 4-(phenylsulfenyl)-N-tosyl-1,2,3,4-tetrahydroisoquinolines 4via presumed intramolecular trapping of Pummerer-derived substituted N-benzyl-N-tosyl-α-aminothionium
与取代的苄胺2的(苯基亚磺酰基)乙烯1共轭加成,然后进行N-甲苯磺酸化,得到取代的N-苄基-N-甲苯磺酰基-2-氨基-1-(苯基亚磺酰基)乙烷3。用三甲基甲硅烷基三氟甲磺酸盐-Hünig碱处理3,可通过推测的Pummerer衍生的取代N-苄基-N-甲苯磺酰基-α-氨基硫鎓盐进行分子内捕获,得到4-(苯基亚磺酰基)-N-甲苯磺酰基-1,2,3,4-四氢异喹啉4离子5。