efficient and general aerobic oxidative coupling method to prepare 1,1′-binaphthyl-2,2′-diamines (BINAMs) from N-substituted-2-aminonaphthalene (1) based on [FeIII(cyclen)(Cl)2]Cl catalyst in 1,1,1,3,3,3-hexafluoropropan-2-ol (HFIP) at room temperature is reported. The highlyselective conditions were applied to prepare a list of N,N′-dialkyl-, N,N′-dibenzyl-, and N,N′-diaryl-BINAMs with moderate to high
一种高效、通用的有氧氧化偶联方法,以[Fe III (cyclen)为原料,由N-取代-2-氨基萘(1)制备1,1'-联萘-2,2'-二胺(BINAMs)据报道,室温下 1,1,1,3,3,3-六氟丙-2-醇 (HFIP) 中的 )(Cl) 2 ]Cl 催化剂。应用高选择性条件以中等到高产率制备一系列 N,N'-二烷基-、N,N'-二苄基-和 N,N'-二芳基-BINAM。基于机理研究,包括控制实验和可变时间归一化分析,建议 [Fe III (cyclen)(1)(OOH)] +2 和 2 之间的耦合-氨基萘1是催化循环中关键的不可逆步骤。
Catalytic, Enantioselective Intramolecular Hydroamination of Primary Amines Tethered to Di- and Trisubstituted Alkenes
The in situ preparation of chiral amido alkyl ate yttrium complexes from an array of chiral N-benzyl-like-substituted binaphthyldiamines is reported. These chiral heteroleptic complexes are shown to be efficient catalysts for the enantioselective intramolecular hydroamination of primary amines tethered to sterically demanding alkenes at high reaction temperatures. Fine tuning of their chiral environment allowed up to 77% ee to be reached for the cyclization of aminoalkenes bearing 1,2-dialkyl-substituted carbon-carbon double bonds. These chiral complexes also demonstrate the ability to promote the cyclization of amine-tethered trisubstituted alkenes in up to 55% ee, as the first report of the formation of enantioenriched quaternary centers by an hydroamination reaction.