Enantiopure tetrahydroisoquinolines via N -sulfinyl Pictet–Spengler reactions
摘要:
Asymmetric Pictet-Spengler reactions with (R)-N-p-tolylsulfinyl-3,4-dimethoxyphenylethyl amine proceeded with high diastereo selectivity. Starting from the commercially available (R)- and (S)-Andersen reagents a highly efficient route to (+)- and (-)-salsolidine and related tetrahydroisoquinolines was developed. (C) 2001 Elsevier Science Ltd. All rights reserved.
Short stereoselective synthesis of (+)-crispine A via an N-sulfinyl Pictet–Spengler reaction
摘要:
We report the highly stereoselective synthesis of (R)-(+)-crispine A from the (R)-N-sulfinyl amine 1 by using a one-pot process involving the Pictet-Spengler reaction with 4-chlorobutanal, removal of the sulfinyl group by protonolysis of the N-S bond and in situ cyclization, with a 55% overall yield. (C) 2013 Elsevier Ltd. All rights reserved.
Short stereoselective synthesis of (+)-crispine A via an N-sulfinyl Pictet–Spengler reaction
作者:Rubén Sánchez-Obregón、Benjamín Ortiz、Virginia M. Mastranzo、Francisco Yuste、José Luis García Ruano
DOI:10.1016/j.tetlet.2013.01.121
日期:2013.4
We report the highly stereoselective synthesis of (R)-(+)-crispine A from the (R)-N-sulfinyl amine 1 by using a one-pot process involving the Pictet-Spengler reaction with 4-chlorobutanal, removal of the sulfinyl group by protonolysis of the N-S bond and in situ cyclization, with a 55% overall yield. (C) 2013 Elsevier Ltd. All rights reserved.
Enantiopure tetrahydroisoquinolines via N -sulfinyl Pictet–Spengler reactions
Asymmetric Pictet-Spengler reactions with (R)-N-p-tolylsulfinyl-3,4-dimethoxyphenylethyl amine proceeded with high diastereo selectivity. Starting from the commercially available (R)- and (S)-Andersen reagents a highly efficient route to (+)- and (-)-salsolidine and related tetrahydroisoquinolines was developed. (C) 2001 Elsevier Science Ltd. All rights reserved.