A P,N ligand with central and axial chiral elements: synthesis and application in allylic alkylation
作者:Igor Mikhael、Catherine Goux-Henry、Denis Sinou
DOI:10.1016/j.tetasy.2006.06.040
日期:2006.7
5-dihydro-3H-dinaphtho[1,2-e:2′,1′-c]azepine were prepared starting from (2S,3S)-4-amino-2,3-O-isopropylidenebutane-1,2,3-triol and (R)- and (S)-binaphthol. These ligands, in association with Pd(0) gave enantioselectivities up to 89% (S) and 36% (R) ee for the (SA,4S,5R) and the (RA,4S,5R) ligands in the alkylation of racemic 1,3-diphenylprop-2-enyl acetate with dimethyl malonate, showing that the binaphthyl
4-(5-[(二苯基膦基甲基)甲基] -2,2-二甲基-1,3-二氧戊环-4-基}甲基)-4,5-二氢-3 H-二萘并[1,2- ë:2',1,1'- ç ]氮杂制备由式(2开始小号,3小号)-4-氨基-2,3- ö -isopropylidenebutane -1,2,3-三醇和(- [R )-和(小号)-联萘酚。这些配体与Pd(0)结合,对(S A,4 S,5 R)和(R A,4 S,5 R)ee的对映选择性高达89%(S)和36%(R)ee。外消旋的1,3-二苯基丙-2-烯丙基乙酸酯与丙二酸二甲酯的烷基化反应中的配体),表明联萘基部分是新立体生成中心的对映选择性生成中最重要的结构。