Thioorthoesters in the activated Pictet–Spengler cyclization. Synthesis of 1-thiosubstituted tetrahydroisoquinolines and carboncarbon bond formation via sulfonyl iminium ions generated from N,S-sulfonyl acetals
摘要:
The elaboration of 1-alkylthio- and 1-arylthio-tetrahydroisoquinolines by means of the activated Pictet-Spengler reaction of N-sulfonyl-beta-phenethylamines with thioorthoesters as electrophiles, and their use as sulfonyl iminium ion precursors for carbon-carbon bond formation, leading to 1-substituted tetrahydroisoquinoline derivatives, is reported. (C) 2003 Elsevier Ltd. All rights reserved.
Desulfonylation of N-Sulfonyl Tetrahydroisoquinoline Derivatives by Potassium Fluoride on Alumina Under Microwave Irradiation: Selective Synthesis of 3,4-Dihydroisoquinolines and Isoquinolines
作者:Claudio C. Silveira、Carmem R. Bernardi、Antonio L. Braga、Teodoro S. Kaufman
DOI:10.1055/s-2002-31923
日期:——
In a solvent-free system, the microwave irradiation of mixtures of N-sulfonyl tetrahydroisoquinolines and 37% potassium fluoride supported on alumina selectively furnished 3,4-dihydroisoquinolines or isoquinolines, depending upon the reaction time.
Thioorthoesters in the activated Pictet–Spengler cyclization. Synthesis of 1-thiosubstituted tetrahydroisoquinolines and carboncarbon bond formation via sulfonyl iminium ions generated from N,S-sulfonyl acetals
作者:Claudio C Silveira、Carmem R Bernardi、Antonio L Braga、Teodoro S Kaufman
DOI:10.1016/s0040-4039(03)01452-7
日期:2003.8
The elaboration of 1-alkylthio- and 1-arylthio-tetrahydroisoquinolines by means of the activated Pictet-Spengler reaction of N-sulfonyl-beta-phenethylamines with thioorthoesters as electrophiles, and their use as sulfonyl iminium ion precursors for carbon-carbon bond formation, leading to 1-substituted tetrahydroisoquinoline derivatives, is reported. (C) 2003 Elsevier Ltd. All rights reserved.