Chiral 1,3,2-Diazaphospholenes as Catalytic Molecular Hydrides for Enantioselective Conjugate Reductions
作者:Solène Miaskiewicz、John H. Reed、Pavel A. Donets、Caio C. Oliveira、Nicolai Cramer
DOI:10.1002/anie.201801300
日期:2018.4.3
of chiral, conformationally restricted methoxy‐1,3,2‐diazaphospholene catalysts is reported. We demonstrate their catalytic potential in asymmetric 1,4‐reductions of α,β‐unsaturated carbonyl derivatives, including enones, acyl pyrroles, and amides, which proceeded in enantioselectivities of up to 95.5:4.5 e.r.
1,2,3,2-二氮杂二膦烯原子具有极化的PH键,并以分子氢化物形式出现。本文报道了一类手性,构象受限的甲氧基-1,3,2-二氮杂磷腈催化剂。我们证明了它们在α,β-不饱和羰基衍生物(包括烯酮,酰基吡咯和酰胺)的不对称1,4-还原反应中的催化潜能,其对映选择性高达95.5:4.5 er
[EN] DI-, TRI- AND TETRAPHENYLINDANE DERIVATIVES AND THEIR USE IN ORGANIC ELECTRONICS<br/>[FR] DÉRIVÉS DE DI-, TRI- ET TÉTRAPHÉNYLINDANE, ET LEUR UTILISATION EN ÉLECTRONIQUE ORGANIQUE
申请人:DOTTIKON ES HOLDING AG
公开号:WO2020094847A1
公开(公告)日:2020-05-14
The present invention relates to indane derivatives of the formula (I) and mixtures thereof, wherein X is selected from groups of the formulae -A-NH2 or -A-(NAr2), wherein A is a chemical bond or phenylene which is unsubstituted or substituted by 1, 2, 3 or 4 substituents selected from C1-C6 alkyl and C1-C6-alkoxy; Ar is unsubstituted or substituted aryl, wherein two groups Ar bound to the same nitrogen atom may together with the nitrogen atom also form a fused ring system having 3 or more than 3 unsubstituted or substituted rings; and the variables RA, RB, Y, k, I, m, p, q and r are as defined in the claims and the description. The invention further relates to methods for preparing such compounds and their use in organic electronics, in particular as hole transport material or electron blocking material.
Lewis Base-Catalyzed Enantioselective Conjugate Reduction of β,β-Disubstituted α,β-Unsaturated Ketones with Trichlorosilane: <i>E</i>/<i>Z</i>-Isomerization, Regioselectivity, and Synthetic Applications
The chiral bisphosphine dioxide-catalyzed asymmetric conjugate reduction of acyclic β,β-disubstituted α,β-unsaturatedketones with trichlorosilane affords saturated ketones having a stereogenic carbon center at the carbonyl β-position with high enantioselectivities. Because the E/Z-isomerizations of enone substrates occur concomitantly, reduction products with the same absolute configurations are obtained
作者:Saumya Verma、Vikram Singh、Jawahar L. Jat、Bhoopendra Tiwari
DOI:10.1021/acs.joc.3c02478
日期:2024.6.7
The Beckmann reaction is one of the most atom-economical methods for the preparation of amides from ketones. Unlike ketones, the multiple competing reactivities of enones as well as the requirement of demanding reaction conditions for in situ generation of oximes have severely impacted the application of this reaction for the preparation of α,β-unsaturated amides. Herein, we describe the first chemoselective