Chiral Cobalt(III) Tris(1,2-diamine) Catalysts That Incorporate Nitrogenous Base Containing Anions for the Bifunctional Activation of Nucleophiles and Electrophiles in Enantioselective Addition Reactions
作者:Connor Q. Kabes、Reagan F. Lucas、Jack H. Gunn、John A. Gladysz
DOI:10.1021/acscatal.1c01883
日期:2021.7.2
The lipophilic diastereomeric cobalt complexes Λ or Δ-[Co((S,S)-dpen)3]3+ 2Cl–BArf– (Λ or Δ-(S,S)-23+ 2Cl–BArf–; dpen/BArf– = 1,2-diphenylethylenediamine/B(3,5-C6H3(CF3)2)4–) catalyze a number of enantioselective C–H bond addition reactions in the presence of aliphatic tertiary amines, but pyridine and N,N-dimethylaniline are much less effective. However, when these bases are incorporated into counter
亲脂性非对映钴配合物 Λ 或 Δ-[Co(( S , S )-dpen) 3 ] 3+ 2Cl – BAr f – (Λ 或 Δ-( S , S )- 2 3+ 2Cl – BAr f – ; dpen /BAr f – = 1,2-二苯基乙二胺/B(3,5-C 6 H 3 (CF 3 ) 2 ) 4 – ) 在脂肪族叔胺存在下催化许多对映选择性的 C–H 键加成反应,但吡啶和N ,N-二甲基苯胺的效果要差得多。然而,当这些碱以 Λ 或 Δ-( S , S )- 2 3+ 4 – Cl – BAr f – 的形式结合到抗衡阴离子 ( 4 – ) 中时,可以实现高度对映选择性的双功能催化剂。烟酸盐、异烟酸盐、相关磺酸盐和N , N-二甲氨基苯甲酸酯是有效的。6-氯烟酸盐提供较慢的速率和较低的ee值,而6-氨基烟酸盐提供较快的速率和较高的ee值。6-甲基、2-甲氧基和未取代的类似物提供中间结果