1,3-Difunctionalization of β-Alkyl Nitroalkenes via Combination of Lewis Base Catalysis and Radical Oxidation
作者:Ye Wang、Lei Zheng、Xiaodong Shi、Yunfeng Chen
DOI:10.1021/acs.orglett.0c04106
日期:2021.2.5
catalyst, β-alkyl-substituted nitroalkenes could be readily converted into allylicnitrocompounds. Examples of either C-1 or C-3 functionalization methods have been reported through nitro-elimination, giving alkene products. In this work, successful 1,3-difunctionalization was achieved through a synergetic Lewis base catalysis and TBHP radical oxidation, giving vinylic alkoxyamines in good to excellent
A One-Pot Reaction toward the Diastereoselective Synthesis of Substituted Morpholines
作者:Thomas Aubineau、Janine Cossy
DOI:10.1021/acs.orglett.8b03141
日期:2018.12.7
The diastereoselectivesynthesis of various substituted morpholines has been achieved from vinyloxiranes and amino-alcohols under sequential Pd(0)-catalyzed Tsuji–Trost/Fe(III)-catalyzed heterocyclization. Using the same strategy, 2,6-, 2,5-, and 2,3-disubstituted as well as 2,5,6- and 2,3,5-trisubstituted morpholines were obtained in good to excellent yields and diastereoselectivities.
Recyclable Cu(II)-macrocyclic salen complexes catalyzed nitroaldol reaction of aldehydes: A practical strategy in the preparation of (R)-phenylephrine
作者:Rukhsana I. Kureshy、Balchand Dangi、Anjan Das、Noor-ul H. Khan、Sayed H.R. Abdi、Hari C. Bajaj
DOI:10.1016/j.apcata.2012.06.042
日期:2012.10
1′-binaphthyl-2,2′-diamine with trigol bis aldehyde were prepared and characterized by microanalysis, 1H NMR, UV/Vis. spectroscopy, optical rotation and mass spectroscopy. Highlyenantioselective nitroaldol reaction of various aromatic and aliphatic aldehydes with nitromethane in presence of several bases were carried out in the presence of in situ generated Cu(I)/Cu(II) complexes with chiral macrocyclic
衍生自1 R,2 R -(-)-1,2-二氨基环己烷,1 R,2 R -(+)-1,2-二苯基-1,2-二氨基乙烷的手性大环Salen配体1'-3' [R )- (+) - 1,1 '联萘-2,2 ' -二胺与trigol二醛制备和表征通过元素分析,1 H NMR,UV /可见光。光谱学,旋光性和质谱学。在具有几种碱的情况下,在具有手性大环赛伦配体1'–3'的原位生成的Cu(I)/ Cu(II)配合物的存在下,进行了各种芳香族和脂肪族醛与硝基甲烷的高度对映选择性硝基醛反应在RT。如果在3-甲基苯甲醛和4-硝基苯甲醛的条件下,大约有对映选择性(ee,〜95%)的β-硝基醇具有很高的收率(相对于醛而言高达92%)。在2,6-二甲基吡啶为碱的情况下,使用具有CuCl 2 ·2H 2 O的手性大环赛伦配体3'进行30小时的反应。手性大环赛伦催化剂3介导的硝基羟醛工艺是可回收的(最多8个循环,其性能
Umsetzungen von Dilithio-nitroalkanen und -allylnitroderivaten mit Carbonylverbindungen
作者:Friedrich Lehr、Jutta Gonnermann、Dieter Seebach
DOI:10.1002/hlca.19790620722
日期:1979.10.31
Reactions of dilithio-nitroalkanes and dilithio-allynitroalkanes with carbonyl compounds
Alkylation of Ketene Silyl Acetals with Nitroolefins Mediated by Sterically Encumbered Lewis Acids
作者:John A. Tucker、Terrance L. Clayton、Donald M. Mordas
DOI:10.1021/jo9624004
日期:1997.6.1
procedures for the corresponding reaction of esters suffer from important limitations such as modest yields, lack of demonstrated generality, inconveniently low reaction temperatures, and/or the use of a large excess of one of the two reactants. In the present work, we examined the efficacy of a series of Lewisacid catalysts for the alkylation of ketenesilylacetals with nitroolefins. Previously reported