Stereospecific synthesis of oxazolo[3,4-b]tetrahydroisoquinolin-3-ones, analogs of podophyllotoxin, via benzotriazole methodology
摘要:
A stereospecific synthesis of 2-azapodophyllotoxin analogues based on benzotriazole methodology is reported. Intramolecular Friedel-Crafts reactions of benzotriazole Mannich adducts 2/3b-1 afforded 5-substituted oxazolo[3,4-b]tetrahydroisoquinolines 5b-1 as pure stereoisomers. (C) 1999 Elsevier Science Ltd. All rights reserved.
Stereospecific synthesis of oxazolo[3,4-b]tetrahydroisoquinolin-3-ones, analogs of podophyllotoxin, via benzotriazole methodology
作者:Alan R. Katritzky、Justo Cobo-Domingo、Baozhen Yang、Peter J. Steel
DOI:10.1016/s0957-4166(98)00506-0
日期:1999.1
A stereospecific synthesis of 2-azapodophyllotoxin analogues based on benzotriazole methodology is reported. Intramolecular Friedel-Crafts reactions of benzotriazole Mannich adducts 2/3b-1 afforded 5-substituted oxazolo[3,4-b]tetrahydroisoquinolines 5b-1 as pure stereoisomers. (C) 1999 Elsevier Science Ltd. All rights reserved.
Diastereoselective synthesis of oxazolo[3,4-b]tetrahydroisoquinolin-3-ones via Lewis acid TMSOTf-mediated Pictet–Spengler reaction
An alternative and efficient method to stereoselectively synthesize oxazolo[3,4-b]tetrahydroisoquinolin-3-ones via a Pictet-Spengler reaction promoted by Lewis acid TMSOTf from readily available (S)-4-benzyl-2-oxazolidinone with various aromatic, aliphatic, and cyclic aldehydes under room temperature is described. (C) 2013 Elsevier Ltd. All rights reserved.