New Access to 2,3-Disubstituted Quinolines through Cyclization of o-Alkynylisocyanobenzenes
摘要:
[GRAPHICS]o-Alkynylisocyanobenzenes underwent nucleophile-induced intramolecular cyclization to give 2,3-disubstituted quinoline derivatives in high yields. In addition to the oxygen and nitrogen nucleophiles such as methanol and diethylamine, the nucleophilic carbon of the enolate of malonate induced the cyclization effectively. Reaction of 1,4-di(trimethylsilylethynyl)-2,3-diisocyanobenzene with methanol afforded 2,9-dimethoxy-1,10-phenanthroline in good yield.
Synthesis of 2,4-Diiodoquinolines via the Photochemical Cyclization of <i>o</i>-Alkynylaryl Isocyanides with Iodine
作者:Takenori Mitamura、Akiya Ogawa
DOI:10.1021/jo1021772
日期:2011.2.18
Upon photoirradiation of o-alkynylaryl isocyanides in the presence of iodine, the intramolecular cyclization of o-alkynylaryl isocyanides proceeds to afford the corresponding 2,4-diiodoquinolines in good yields. 2,4-Diiodoquinolines can be employed in transition metal-catalyzed cross-coupling reactions.
(PhTe)<sub>2</sub>-Mediated Intramolecular Radical Cyclization of <i>o</i>-Ethynylaryl Isocyanides Leading to Bistellurated Quinolines upon Visible-Light Irradiation
作者:Takenori Mitamura、Kimiyo Iwata、Akiya Ogawa
DOI:10.1021/ol901267h
日期:2009.8.6
Upon treatment with (PhTe)(2) under visible-light irradiation, o-ethynylaryl isocyanides underwent intramolecular radical cyclization with introduction of telluro groups, affording the corresponding bistellurated quinolines.