Diversity-Oriented Synthesis of 3-Iodochromones and Heteroatom Analogues via ICl-Induced Cyclization
作者:Chengxiang Zhou、Anton V. Dubrovsky、Richard C. Larock
DOI:10.1021/jo0523722
日期:2006.2.1
The ICl-inducedcyclization of heteroatom-substituted alkynones provides a simple, highly efficient approach to various 3-iodochromones and analogues. This process is run under mild conditions, tolerates various functional groups, and generally provides chromones in good to excellent yields. Subsequent palladium-catalyzed transformations afford a rapid increase in molecular complexity and a convenient
A Straightforward Synthesis of Ynones by Reaction of Dimethylalkynylaluminum Reagents with Acid Chlorides
作者:Baomin Wang、Martine Bonin、Laurent Micouin
DOI:10.1021/jo050760y
日期:2005.7.1
Alkynyldimethylaluminum reagents react with various aromatic and aliphatic acidchlorides in a fast and efficient way. This reaction provides a simple entry to numerous ynones, using readily available, inexpensive, and nontoxic metalating agent, and does not require any transition metal as a catalyst.
Radical cyclization of alkynyl aryl ketones for the synthesis of 3-seleno-substituted thiochromones and chromones
作者:Ricardo H. Bartz、Krigor B. Silva、Thiago J. Peglow、Angelita M. Barcellos、Raquel G. Jacob、Eder J. Lenardão、Gelson Perin
DOI:10.1039/d2ob01762h
日期:——
ones and 3-organylselanylchromones via the radical cyclization reaction between alkynyl aryl ketones containing an ortho-thiopropyl/methoxygroup and diorganyl diselenides promoted by Oxone®. This method allows the construction and seleno-functionalization of thiochromones and chromones using Oxone® as a stable and non-hazardous oxidizing agent in the presence of CH3CN at 82 °C. These reactions tolerate
Treatment of 2-(1-aryl-3-propynoyl) anisoles 1 with N-chlorosuccinimide (NCS) or N-bromosuccinimide (NBS) gave the 3-halogenated flavones and their related molecules in moderate yields.