沿着现代可持续氧化的路线,描述了一种绿色和温和的有机催化合成方法,用于从链烯酸合成羟基内酯。反应包括有机催化剂(2,2,2-三氟甲基苯乙酮)活化H 2 O 2,烯基氧化为相应的环氧化物以及分子内酯化以提供各种取代的γ-或δ-内酯多种替代模式,高到高产量。如果转化率是定量的,则在简单萃取后就可以得到高纯度的产物。试图使过程不对称的尝试取得了有限的成功。
作者:Mikhail D. Kosobokov、Vitalij V. Levin、Marina I. Struchkova、Alexander D. Dilman
DOI:10.1021/acs.orglett.5b00097
日期:2015.2.6
CF2 fragment is described. The reaction involves silylation, room-temperature difluorocyclopropanation of silyl enol ethers, and selective ringopening of cyclopropanes under acidic conditions. The whole three-step sequence is conveniently performed in a one-pot mode.
the synthesis of fluorinatedcompounds have been intensively studied, recently. Development of practical fluorinating reagents is indispensable for this purpose. Herein, bench-stable electrophilic fluorinating reagents were synthesized as N-fluorobenzenesulfonimide (NFSI) substitutes. Reagents obtained by replacing one of the NFSI sulfonyl groups with an acyl group led to the highly selective monofluorination
[EN] METAL-CATALYZED COUPLING OF ARYL AND VINYL HALIDES WITH ALPHA, ALPHA-DIFLUOROCARBONYL COMPOUNDS<br/>[FR] COUPLAGE CATALYSÉ MÉTALLIQUE D'HALOGÉNURES D'ARYLE ET DE VINYLE AVEC DES COMPOSÉS ALPHA, ALPHA-DIFLUOROCARBONYLE
申请人:UNIV CALIFORNIA
公开号:WO2014165861A1
公开(公告)日:2014-10-09
The coupling of aryl, heteroaryl, and vinyl halides with α,α-difluoroketones or silyl ethers or siylenol ethers of α,α-difluoroketones and α,α-difluoroamides and esters are described. Further derivatization of the coupling products (such as ketone cleavage and Baeyer-Villiger oxidation) is also described.
Described herin are molecules for use in organic light emitting diodes. Example molecules comprise at least one acceptor moiety A, at least one donor moiety D, and optionally one or more bridge moieties B. Each moiety A is covalently attached to either the moiety B or the moeity D, each moiety D is covalently attached to either the moeity B or the moeity A, and each B is covalently attached to at least one moiety A and at least one moiety D. Values and preferred values of moieties A, D and B are defined herein.
Direct Catalytic Asymmetric Aldol Reaction of α‐Alkoxyamides to α‐Fluorinated Ketones
作者:Roman Pluta、Naoya Kumagai、Masakatsu Shibasaki
DOI:10.1002/anie.201814607
日期:2019.2.18
α‐Oxygen‐functionalized amides found particular utility as enolate surrogates for direct aldol couplings with α‐fluorinated ketones in a catalytic manner. Because of the likely involvement of open transition states, both syn‐ and anti‐aldoladducts can be accessed with high enantioselectivity by judicious choice of the chiral ligands. A broad variety of alkoxy substituents on the amides and aryl and fluoroalkyl