Design, Synthesis, and Applications of Potential Substitutes of <i>t</i>-Bu-Phosphinooxazoline in Pd-Catalyzed Asymmetric Transformations and Their Use for the Improvement of the Enantioselectivity in the Pd-Catalyzed Allylation Reaction of Fluorinated Allyl Enol Carbonates
作者:Étienne Bélanger、Marie-France Pouliot、Marc-André Courtemanche、Jean-François Paquin
DOI:10.1021/jo2019653
日期:2012.1.6
substitutes of t-Bu-PHOX in asymmetric catalysis is reported. The design relies on the incorporation of geminal substituents at C5 in combination with a substituent at C4 other than t-butyl (i-Pr, i-Bu, or s-Bu). Most of these new members of the PHOX ligand family behave similarly in terms of stereoinduction to t-Bu-PHOX in three palladium-catalyzed asymmetric transformations. Electronically modified ligands
报道了t -Bu-PHOX的潜在替代品在不对称催化中的设计,合成和应用。该设计依赖于在C5处引入双键取代基与在C4处而不是叔丁基(i- Pr,i- Bu或s- Bu)的取代基的结合。在三个钯催化的不对称转化中,PHOX配体家族的这些新成员中的大多数在立体诱导方面与t -Bu-PHOX相似。还制备了电子修饰的配体,并用于改善氟化烯丙基烯醇碳酸酯在钯催化的烯丙基化反应中的对映选择性。