Asymmetric synthesis of a dopamine D1 agonist, dihydrexidine from d-serine
摘要:
A scalable asymmetric synthesis of trans-2-amino-6,7-dimethoxy-1-phenyltetralin 2 and its N-nosyl derivative 12 have been achieved from Garner aldehyde derived from easily available D-serine using a stereoselective PhMgBr addition, Wittig reaction and TFA-mediated Friedel-Crafts cyclization as the key steps. The synthesis of dihydrexidine is accomplished from the N-nosyl-2-amino-1-phenyltetralin 12. (C) 2011 Elsevier Ltd. All rights reserved.
Asymmetric synthesis of a dopamine D1 agonist, dihydrexidine from d-serine
摘要:
A scalable asymmetric synthesis of trans-2-amino-6,7-dimethoxy-1-phenyltetralin 2 and its N-nosyl derivative 12 have been achieved from Garner aldehyde derived from easily available D-serine using a stereoselective PhMgBr addition, Wittig reaction and TFA-mediated Friedel-Crafts cyclization as the key steps. The synthesis of dihydrexidine is accomplished from the N-nosyl-2-amino-1-phenyltetralin 12. (C) 2011 Elsevier Ltd. All rights reserved.
Synthesis of α-diazo-β-hydroxyesters through a one-pot protocol by phase-transfer catalysis: application to enantioselective aldol-type reaction and diastereoselective synthesis of α-amino-β-hydroxyester derivatives
作者:Kazuya Hasegawa、Shigeru Arai、Atsushi Nishida
DOI:10.1016/j.tet.2005.11.028
日期:2006.2
The one-pot synthesis of α-diazo-β-hydroxyesters from sodium azide under phase-transfer-catalyzed conditions has been achieved. This protocol includes three different chemical transformations promoted by a single catalyst in each step to give products in good to excellent yields. The reaction was applied to a catalytic asymmetric aldol-type reaction using α-diazoesters with aldehydes in the presence