Palladium(II) Complexes of C2-Bridged Chiral Diphosphines: Application to Enantioselective Carbonyl-Ene Reactions
作者:He-Kuan Luo、Yuan-Ling Woo、Herbert Schumann、Chacko Jacob、Martin van Meurs、Hai-Yan Yang、Yen-Ting Tan
DOI:10.1002/adsc.200900888
日期:——
2R,2′R)‐1,1′‐bis(1,1‐dimethylethyl)‐2,2′‐biphospholane [(S,S,R,R)‐TANGPHOS] and (2R,2′R,5R,5′R)‐1,1′‐(1,2‐phenylene)bis[2,5‐bis(1‐methylethyl)phospholane] [(R,R)‐i‐Pr‐DUPHOS] are C2‐bridged chiral diphosphines that form stable complexes with palladium(II) and platinum(II) containing a five‐membered chelate ring. The Pd(II)‐BINAPHANE catalyst displayed good to excellent enantioselectivities with ee
(11b R,11'b R)‐4,4′‐(1,2-苯撑)双[4,5‐dihydro‐3 H ‐ dinaphtho [2,1 ‐ c:1′,2′‐ e ] ] [简称为(- [R)-BINAPHANE],(3 - [R,3' - [R,4小号,4'小号,11B小号,11'B小号)-4,4'-双(1,1-二甲基乙基)-4- ,4',5,5'-tetrahydro‐3,3'-bi‐3 H -dinaphtho [2,1- c:1',2'- e ] phosphepin [(S)-BINAPINE],(1 S, 1'小号,2 - [R,2' - [R)-1,1'-双(1,1-二甲基乙基)-2,2'- biphospholane [(S,S,R,R)-TangPhos]和(2 - [R,2' - [R,5 - [R,5' - [R)-1,1' - (1,2-亚苯基)双[2,5-双(1-甲基乙基)磷杂环戊烷]