A series of chiral amino alcohols transformed into the formamidine derivative of 1, 2, 3, 4-tetrahydroisoquinolines were evaluated as chiral dipole-stabilized anions. Alkylation with alkyl halides provided the 1-alkyl-l, 2, 3, 4-tetrahydroisoquinolines in both excellent yield and enantiomeric purity.
Simple Preparation Process of<i>syn</i>Phenylpropanolamines from Racemic<i>O</i>-TBDPS Cyanohydrins
作者:Qing-lan Li、Shi Tang、Dong Zhou、Xin-mei Tang
DOI:10.1080/00397911.2013.862835
日期:2014.6.3
this article, a practically interesting route for the diastereoselective synthesis of phenylpropanolamines has been demonstrated for the first time. Using racemic O-tert-butyldiphenylsilyl (TBDPS) cyanohydrins as the starting materials, various syn phenylpropanolamines and derivatives (e.g., norpseudophedrine) have been successfully prepared in exellent diastereoselectivity via a practically interesting
Mueller,H.K. et al., Journal fur praktische Chemie (Leipzig 1954), 1973, vol. 315, p. 611 - 619
作者:Mueller,H.K. et al.
DOI:——
日期:——
Enantioselective rearrangement of a meso-cyclohexene oxide using norephedrine-derived chiral bases
作者:Bob Colman、Simon E de Sousa、Peter O'Brien、Timothy D Towers、Will Watson
DOI:10.1016/s0957-4166(99)00432-2
日期:1999.10
Using a chiral base from a norephedrine-derived diamine, the enantioselective rearrangement of a mesocyclohexene oxide can be performed in 94% yield and with 94% enantioselectivity. The enantioselectivity is lower (86% ee) with the diastereoisomeric chiral base. In order to prepare the diastereoisomeric chiral base, a potentially useful way of converting norephedrine into norpseudophedrine was developed. (C) 1999 Elsevier Science Ltd. All rights reserved.
Nagai; Kanao, Justus Liebigs Annalen der Chemie, 1929, vol. 470, p. 174