A New Tactic for Tocopherol Synthesis Using Intramolecular Benzyne Trapping by an Alcohol
摘要:
A formal total synthesis of (S)-alpha-tocopherol, the major component of natural Vitamin E has been achieved using intramolecular benzyne trapping as a key step to form the chroman ring. The synthesis also features an efficient new method for benzotriazole N-amination using an oxaziridine; chiral, nonracemic intermediates are generated using asymmetric dihydroxylation.This paper is dedicated to Professor Lutz Tietze on his 75th birthday, with all best wishes.
Enantioselective Total Syntheses of (<i>R</i>)- and (<i>S</i>)-Naphthotectone, and Stereochemical Assignment of the Natural Product
作者:Guillermo A. Guerrero-Vásquez、Flávia A. D. Galarza、José M. G. Molinillo、Carlos Kleber Z. Andrade、Francisco A. Macías
DOI:10.1002/ejoc.201501479
日期:2016.3
core of the final products was obtained by a late-stage anodic treatment. (R)-Naphthotectone was obtained in six steps from leuconaphthazarin with an overall yield of 38 % and an enantiomeric excess of 86 %. This compound was found to have the same absolute configuration as the natural product at its C-3′ stereogenic center. (S)-Naphthotectone was obtained in five steps from leuconaphthazarin with an
A synthesis of α-tocopherol featuring benzyne trapping by an alcohol
作者:David W. Knight、Xu Qing
DOI:10.1016/j.tetlet.2009.03.022
日期:2009.7
A formal total synthesis of alpha-tocopherol, the main component of Vitamin E, has been achieved in which a central step is the intramolecular trapping of a highly substituted benzyne by an alcohol group to establish the pyran ring. (C) 2009 Elsevier Ltd. All right reserved.