Palladium(II) Acetate Catalyzed Cyclization–Coupling of (o-Ethynylphenyl)phosphonic Acid Monoesters with Allyl Halides
作者:Zecai Xiao、Ai-Yun Peng
DOI:10.1055/s-0039-1689936
日期:2019.9
Pd(OAc)2-catalyzed tandem cyclization–coupling reaction of (o-ethynylphenyl)phosphonicacid monoesters and allyl halides has been developed. This reaction provides an efficient, mild, general and regioselective way to synthesize 4-allylphosphaisocoumarins. A Pd(OAc)2-catalyzed tandem cyclization–coupling reaction of (o-ethynylphenyl)phosphonicacid monoesters and allyl halides has been developed. This reaction
In this work, we found that acids (i.e., HCl and NaHSO3) rather than bases could catalyze the cyclization of o-alkynylphenylphosphonicacidmonoesters at slow rates and give phosphaisocoumarins in low to medium yields, whereas the cyclization of (o-hydroxyphenyl)ethynylphosphinates proceeded very smoothly under basic conditions rather than acidic conditions, and a series of phosphachromones could be
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 Phosphaisoquinolin-1-ones by Pd(II)-Catalyzed Cyclization of <i>o</i>-(1-Alkynyl)phenylphosphonamide Monoesters
作者:Wei Tang、Yi-Xiang Ding
DOI:10.1021/jo0614644
日期:2006.10.1
honamide monoethyl esters was examined, and a newclass of six-membered phosphorusheterocycles (phosphaisoquinolin-1-ones) were formed with high regioselectivity and good yields. The present reaction is the first example of intramolecular addition of P−NH to substituted alkynes, which provides a valuable way to synthesize novel phosphorusheterocycles with potential bioactivities.
Cu(I)-Catalyzed Cyclized Coupling Reaction of<i>o</i>-Ethynylphenylphosphonic Acid Monoesters with Allyl Bromide
作者:Yi-Xiang Ding、Ping Wei
DOI:10.1055/s-2005-863717
日期:——
4-Allylphosphaisocoumarins can be prepared in good yield and with high regioselectivity by the reaction of o-ethynyl-phenylphosphonic acidmonoesters with allyl bromide catalyzed by Cut. The present reaction represents the first example of a phosphonic acidmonoestercyclized coupling reaction with alkyl halide.