Development of New P-Chiral Phosphorodiamidite Ligands Having a Pyrrolo[1,2-<i>c</i>]diazaphosphol-1-one Unit and Their Application to Regio- and Enantioselective Iridium-Catalyzed Allylic Etherification
作者:Masahiro Kimura、Yasuhiro Uozumi
DOI:10.1021/jo0615403
日期:2007.2.1
designed and prepared. They were preliminarily utilized for iridium-catalyzed asymmetric allylic etherification of cinnamyl carbonate with phenol, where both R- and S-products were obtained with good enantioselectivity (up to 74% ee) by changing the N- and P-substituents of the ligands. The opposite enantioselectivity in iridium-catalyzed allylic substitution was explained by DFT calculations of the energy
设计并制备了十种具有吡咯并[1,2- c ] [1,3,2]二氮杂磷-1-酮骨架的新型P-手性亚磷酰胺基配体。它们被初步用于铱催化的肉桂酸碳酸酯与苯酚的不对称烯丙基烯丙基醚化反应,通过改变配体的N和P取代基,R和S产物均具有良好的对映选择性(最高74%ee)。通过DFT计算π-烯丙基铱-亚磷酰胺基中间体的能量差,可以解释铱催化的烯丙基取代中相反的对映选择性。