Palladium‐Catalyzed Decarboxylative Cycloaddition of Vinylethylene Carbonates with Formaldehyde: Enantioselective Construction of Tertiary Vinylglycols
作者:Ajmal Khan、Renfeng Zheng、Yuhe Kan、Jiang Ye、Juxiang Xing、Yong Jian Zhang
DOI:10.1002/anie.201403754
日期:2014.6.16
An efficient method for the enantioselective construction of tertiary vinylglycols through a palladium‐catalyzed asymmetric decarboxylative cycloaddition of vinylethylene carbonates with formaldehyde was developed. By using a palladium complex generated in situ from [Pd2(dba)3]⋅CHCl3 and a phosphoramidite ligand as a catalyst under mild reaction conditions, the process allows conversion of racemic
开发了一种通过钯催化碳酸亚乙烯酯与甲醛的不对称脱羧环加成反应,对叔乙烯基二醇进行对映选择性构建的有效方法。通过在温和的反应条件下使用由[Pd 2(dba)3 ]·CHCl 3原位生成的钯配合物和亚磷酰胺配体作为催化剂,该方法可以使外消旋的4-取代的4-乙烯基-1,3-二氧戊环转化作为亚甲基缩醛保护的叔乙烯基二醇,可将-2-酮转化为相应的1,3-二氧戊环,并具有良好或优异的对映选择性。