Stereoselective Synthesis of Disubstituted Naphthalene-1,2-oxides
摘要:
Spiroepoxy naphthalenones, obtained from the stereoselcctive oxidation of 2-hydroxyalkyl-1-naphthols with sodium periodate, were converted to naphthalene-1,2-oxides by reaction with methyllithium followed by Payne rearrangement.
Dearomative Cascade Photocatalysis: Divergent Synthesis through Catalyst Selective Energy Transfer
作者:Michael J. James、Jonas Luca Schwarz、Felix Strieth-Kalthoff、Birgit Wibbeling、Frank Glorius
DOI:10.1021/jacs.8b03302
日期:2018.7.18
The discovery and application of dearomative cascade photocatalysis as a strategy in complex molecule synthesis is described. Visible-light-absorbing photosensitizers were used to (sequentially) activate a 1-naphthol derived arene precursor to divergently form two different polycyclic molecular scaffolds through catalyst selective energy transfer.
Dye-sensitized photooxidation of enolictautomers of naphthalenones (5) gave hydroperoxynaphthalenones (6) and naphthols (7). Deoxygenation of 6 by triphenylphosphine gave hydroxynaphthalenones (8).
Direct Syntheses of Benzofuran-2(3<i>H</i>)-ones and Benzofuran-3(2<i>H</i>)-ones from 1-(2-Hydroxyphenyl)alkan-1-ones by CuBr<sub>2</sub>or CuCl<sub>2</sub>
New syntheses of benzofuran-2(3H)-ones and benzofuran-3(211)-ones from l-(2-hydroxyphenyl)alkan-1-ones via oxidative cyclization by CuBr 2 or CuCl 2 are described. A new synthesis of 1H-isochromene-1,4(3H)-diones via similar procedures is also described.