The synthesis of R-3-alkoxy-1-(1′-hydroxyethyl)-4-methoxy-2-(1″-propenyl)benzenes utilizing Corey–Bakshi–Shibata asymmetric reductions
作者:Charles B de Koning、Robin G.F Giles、Ivan R Green、Nazeem M Jahed
DOI:10.1016/s0040-4020(03)00328-4
日期:2003.4
was transformed by initial treatment with methylmagnesiumbromide followed by oxidation of the corresponding alcohols with activated manganese dioxide into a series of ketones 15–17. Palladium(0) catalysed isomerization of the double bond in the prop-2′-enyl side-chain afforded ketones 36–38 which were subjected to the Corey–Bakshi–Shibata asymmetric reduction protocol to afford the R-3-alkoxy-1-(1′
Mercury(II) mediated cyclisation of R-1-(1′-hydroxyethyl)-2-(1″-propenyl)-3-alkoxy-4-methoxybenzenes to chiral isochromanes
作者:Charles B de Koning、Robin G.F Giles、Ivan R Green、Nazeem M Jahed
DOI:10.1016/j.tet.2004.01.007
日期:2004.3
A protocol has been established for the transformation of chiral ortho 1-hydroxyethyl properyl benzenes under both anaerobic and oxidative mercury(II) mediated conditions to produce chiral isochromanes. Further transformations of the former products yielded chiral isochromanquinones, while the latter afforded the corresponding chiral 4-hydroxyisochromanquinones. (C) 2004 Elsevier Ltd. All rights reserved.