A New Convenient, Efficient, and Regioselective Synthesis of 1,3-Diaryl- 1,3-dihalopropanes
作者:George Kabalka、Zhongzhi Wu、Yuhong Ju
DOI:10.1055/s-2004-829191
日期:——
Reactions of aryl aldehydes with styrenes in the presence of boron trihalides produce 1,3-diaryl-1,3-dihalopropanes in excellent yields.
芳基醛与苯乙烯在三卤化硼存在下反应,生成1,3-二芳基-1,3-二卤丙烷,产率极高。
Boron trihalide-promoted addition of aryl aldehydes to styrenes. A new convenient and highly efficient synthesis of 1,3-dihalo-1,3-diarylpropanes
作者:George W Kabalka、Zhongzhi Wu、Yuhong Ju
DOI:10.1016/s0040-4039(01)01125-x
日期:2001.8
Reactions of aryl aldehydes with styrenes in the presence of borontrichloride in CH2Cl2 at 0°C produce 1,3-dichloro-1,3-diarylpropanes in excellent yields. Reactions carried out using boron tribromide generate the corresponding 1,3-dibromo-1,3-diarylpropane in good yields.
Synthesis of 4,5-Dihydroisoxazoles from Arylcyclopropanes and Nitrosyl Chloride
作者:O. B. Bondarenko、A. Yu. Gavrilova、L. G. Saginova、N. V. Zyk
DOI:10.1023/b:rujo.0000003196.89457.a4
日期:2003.7
Arylcyclopropanes readily react with nitrosyl chloride in liquid sulfur dioxide to give the corresponding 5-aryl-4,5-dihydroisoxazoles in good yield. The reaction is most selective at -40 to -50degreesC; at higher temperature, the contribution of side processes becomes appreciable. The complete conversion of arylcyclopropanes containing donor substituents is attained with the use of 1.5 equiv of nitrosyl chloride, while the rate of the transformation of compounds with nonactivated aromatic rings considerably increases on raising the molar ratio NOCl-arylcyclopropane.
Lewis Acid Mediated Reactions of Aldehydes with Styrene Derivatives: Synthesis of 1,3-Dihalo-1,3-diarylpropanes and 3-Chloro-1,3-diarylpropanols
作者:George W. Kabalka、Zhongzhi Wu、Yuhong Ju、Min-Liang Yao
DOI:10.1021/jo051298k
日期:2005.12.1
The reactions of aryl aldehydes with styrene derivatives, mediated by various boron Lewis acids, were investigated. 1,3-Dihalo-1,3-diarylpropanes were obtained in high yields with boron trihalides, while 3-chloro-1,3-diarylpropanols were obtained in good to excellent yields with phenylboron dichloride. Reactions involving nonenolizable aliphatic aldehydes, trans-cinnamaldehyde, and β-substituted styrenes