A variation of the Pictet–Spengler reaction via a sequential reduction–cyclization reaction of N-acylcarbamates: synthesis of 1-substituted tetrahydroisoquinoline derivatives
of the Pictet–Spengler reaction for the synthesis of 1-substitutedtetrahydroisoquinoline derivatives has been developed. The reaction employs the reduction of N-acylcarbamates by DIBAL-H followed by simultaneous cyclization mediated by BF3·OEt2. The synthetic potential of this method has been illustrated by the synthesis of the tetrahydroisoquinolinealkaloids, (±)-xylopinine, (±)-laudanosine, (±)-
Reductive Formylation of Isoquinoline Derivatives with Formamide and Synthesis of 2-Formyltetrahydroisoquinolines
作者:Atanas P. Venkov、Ilian I. Ivanov
DOI:10.1080/00397919808006842
日期:1998.4
Reductive formylation of isoquinoline derivatives as 3,4-dihydroisoquinolines 1, enamines and enamides of tetrahydroisoquinoline 2 and the reaction of 2-(2-acylphenyl)ethylamides 3 with formamide afforded the corresponding N-formyltetrahydroisoquinolines 4 and N-acyltetrahydroisoquinolines 5.