We report copper(I)‐catalyzedenantio‐ and diastereodivergentborylativecoupling of styrenes and imines to produce enantiomerically‐enriched α,β‐dibranched γ‐boryl amine derivatives. Each of the four possible stereoisomers of the products, derived from the two contiguous stereocenters, was selectively accessible by choosing a proper chiral ligand for the copper catalyst. This method, which combines
Direct Catalytic Asymmetric Mannich-Type Reaction of Benzyl Isocyanide: Stereoselective Synthesis of 1,2-Diarylethylenediamines
作者:Keiji Tamura、Naoya Kumagai、Masakatsu Shibasaki
DOI:10.1002/ejoc.201500336
日期:2015.5
A directcatalyticasymmetricMannich-typereaction of benzyl isocyanide using a CuI catalyst and N-(diphenylthiophosphinoyl)imines was developed. The simultaneous activation strategy by soft–soft interaction was the key to promote the reaction using a weakly acidic pronucleophile, benzyl isocyanide. The spontaneous cyclization of the Mannich adduct afforded the corresponding enantioenriched imidazolines
开发了使用 CuI 催化剂和 N-(二苯基硫代膦酰基) 亚胺的苄基异氰化物的直接催化不对称曼尼希型反应。通过软-软相互作用的同时激活策略是使用弱酸性亲核试剂苄基异氰化物促进反应的关键。曼尼希加合物的自发环化得到相应的对映体富集的咪唑啉,它可能是各种 1,2-二芳基乙二胺的前体。
Diastereoselective Direct Catalytic Asymmetric Mannich-Type Reactions of Alkylnitriles with a Ni(II)-Carbene Complex
作者:Shinya Adachi、Akira Saito、Masakatsu Shibasaki
DOI:10.1021/acs.orglett.2c01624
日期:2022.6.3
Despite recent advances in reactions using alkylnitriles as carbon nucleophiles, diastereoselective directcatalyticasymmetricreactions, in which two consecutive chiral centers could be controlled, remain largely unexplored. Herein, we report the addition of alkylnitriles (such as propionitrile) to imines in the presence of a catalytic amount of a chiral pincer-type Ni-carbene complex and potassium
AbstractAn α‐N3 7‐azaindoline amide serves as a latent enolate to directly engage in an asymmetric Mannich‐type reaction with N‐thiophosphinoyl imines by the action of a cooperative catalyst. The thus‐obtained highly enantioenriched anti‐adduct was transformed into β‐amino‐α‐azido acid in high yield by simple acidic treatment.