p-MeOC6H4/TiCl3: a novel initiator for halogen atom-transfer radical reactions in aqueous media
作者:Lidong Cao、Chaozhong Li
DOI:10.1016/j.tetlet.2008.10.070
日期:2008.12
With the combination of p-methoxybenzene-diazonium tetrafluoroborate with TiCl3 as the initiator, a wide range of halogen atom-transfer radical addition or cyclization reactions could be efficiently implemented in aqueous solution at room temperature.
Self-Protection: The Advantage of Radical Oligomeric Mixtures in Organic Synthesis
作者:Hui Yu、Chaozhong Li
DOI:10.1021/jo035461s
日期:2004.1.1
Atom-transfer radical oligomers of allyl iodoacetates were converted to 4-pentenoic acids upon treatment with zinc. Reactions of the radical oligomers of various omega-alkenyl iodoacetates with Grignard reagents afforded the corresponding substituted tetrahydrofuran derivatives. These results indicated that radical oligomeric mixtures not only serve as versatile intermediates in organic synthesis, but also exhibit unique advantages in that the oligomeric mixtures are self-protected and the deoligomerization functions as the simultaneous deprotection.
Investigation of Bis(tributyltin)-Initiated Free Radical Cyclization Reactions of 4-Pentenyl Iodoacetates
作者:Junhua Wang、Chaozhong Li
DOI:10.1021/jo0109568
日期:2002.2.1
free radical cyclization to generate gamma-iodoheptanolactones which easily underwent intramolecular nucleophilicsubstitution to form bicyclic acylium species (7) as the key intermediate. Subsequent attack by iodide ion furnished gamma-lactones while attack by hydroxide ion gave the tetrahydrofuran derivatives.