Synthesis of 4-halophosphaisocoumarins via halocyclization of 2-(1-alkynyl)phenylphosphonates
作者:Ai-Yun Peng、Yi-Xiang Ding
DOI:10.1016/j.tet.2005.08.032
日期:2005.10
A series of 4-halophosphaisocoumarins were prepared with high regioselectivity in good to excellent yields under mild conditions by the reaction of 2-(1-alkynyl)phenylphosphonic acid diesters with I2 in CHCl3 or ICl in CH2Cl2, or by the reaction of 2-(1-alkynyl)phenylphosphonic acid monoesters with NBS or NCS in DMF. Whether the alkynylphosphonates could cyclize or not was affected by the substituents
Synthesis of Phosphaisocoumarin Acids via Me3SiX-Mediated Dealkylation Reaction
作者:Ai-Yun Peng、Baojian Li、Xun Yang、Junying Lin
DOI:10.1055/s-2008-1067187
日期:2008.8
The dealkylation of phosphaisocoumarin esters was studied under various conditions. An effective way to synthesize phosphaisocoumarin acids was developed via the reaction of phosphaisocoumarin esters with Me3SiBr in chloroform followed by treatment with methanol, or with Me3SiCl and NaI in acetonitrile followed by hydrolysis, under mild conditions in good to excellent yields.
在不同条件下研究了磷酸异香豆素酯的脱烷基化。通过磷酸异香豆素酯与 Me3SiBr 在氯仿中反应,然后用甲醇处理,或在乙腈中与 Me3SiCl 和 NaI 反应,然后水解,开发了一种合成磷酸异香豆素酸的有效方法,在温和条件下具有良好至优异的产率。