Mercury(II) mediated cyclisation of R-1-(1′-hydroxyethyl)-2-(1″-propenyl)-3-alkoxy-4-methoxybenzenes to chiral isochromanes
摘要:
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.
Role of the methoxy group in product formation via TiCl4 promoted 4-phenyldioxolane isomerizationsons
作者:Ivan Robert Green、Natasha October
DOI:10.3998/ark.5550190.0011.206
日期:——
The product distribution obtained from the TiCl4 initiated intramolecular isomerizations of 4methoxyphenyland trimethoxyphenyldioxolanes at -78 C, -30 C and 0 C provided insights into the important regiochemical role played by these groups in such Mukaiyamatype rearrangements through their resonance effects on the aryl ring of the dioxolanes.