Strychnine has been synthesized by a short, highly stereocontrolled route that involves the efficient transformation of commercially available 2-nitrophenylacetonitrile into isostrychnine, a known precursor to strychnine.
Approaches to the Synthesis of (±)-Strychnine via the Cobalt-Mediated [2 + 2 + 2] Cycloaddition: Rapid Assembly of a Classic Framework
作者:Michael J. Eichberg、Rosa L. Dorta、Douglas B. Grotjahn、Kai Lamottke、Martin Schmidt、K. Peter C. Vollhardt
DOI:10.1021/ja016333t
日期:2001.9.1
Five synthetic approaches to racemic strychnine (1), with the cobalt-mediated [2 + 2 + 2] cycloaddition of alkynes to indoles as the key step, are described. These include the generation and attempted cyclization of macrocycle 8 and the synthesis of dihydrocarbazoles 15, 22, and 26 and their elaboration to pentacyclic structures via a conjugate addition, dipolarcycloaddition, and propellane-to-spirofused
The synthesis of 2-substituted 1,4-diacetoxybutadiene derivatives with a partial control of stereochemistry is described from two potentially precursor enals by a judicious choice of experimental conditions (Ac2O/DMAP in Et3N). These conditions have been successfully applied in the first total synthesis of caulerpenyne. (C) 2003 Elsevier Science Ltd. All rights reserved.
Enantioselective Total Synthesis of Wieland-Gumlich Aldehyde and (−)-Strychnine
A totalsynthesis of (-)-strychnine in 15 steps from 1,3-cyclohexanedione in 0.15% overall yield is described. The sequence followed in the assembling of rings is: E-->AE [2-(2-nitrophenyl)-1,3-cyclohexanedione]-->ACE (3a-aryloctahydroindol-4-one)-->ACDE (arylazatricyclic core)-->ABCDE (strychnan skeleton)-->ABCDEF (Wieland-Gumlich aldehyde)-->ABCDEFG (strychnine). The key steps of the synthesis are
Strychnine has been synthesized by a short, highly stereocontrolled route that involves the efficient transformation of commercially available 2-nitrophenylacetonitrile into isostrychnine, a known precursor to strychnine.