2-Methyl-1,4-benzenediol (10) was acylated with alpha -chloroisobutyroyl chloride and converted by treatment with AlCl3 into the indanone derivative 12, which was elaborated into the substituted indane acid 24. Oxidation then afforded racemic puraquinonic acid. (C) 2001 Elsevier Science Ltd. All rights reserved.
2-Methyl-1,4-benzenediol (10) was acylated with alpha -chloroisobutyroyl chloride and converted by treatment with AlCl3 into the indanone derivative 12, which was elaborated into the substituted indane acid 24. Oxidation then afforded racemic puraquinonic acid. (C) 2001 Elsevier Science Ltd. All rights reserved.
Synthesis of Optically Pure (+)-Puraquinonic Acid and Assignment of Absolute Configuration to Natural (−)-Puraquinonic Acid. Use of Radical Cyclization for Asymmetric Generation of a Quaternary Center
作者:Derrick L. J. Clive、Maolin Yu、Mousumi Sannigrahi
DOI:10.1021/jo040115b
日期:2004.6.1
key reactions used to make opticallypure allylic alcohol 40. Radical cyclization of the derived Stork bromo acetals gives lactol ethers 43, which were degraded to generate a quaternary center carrying a methoxycarboxyl group (44 → 47). Compound 47 was converted into (+)-puraquinonic acid; and comparison with a natural sample established that the configuration of the natural compound is 2R (1).