An enantioselective Friedel–Craftsalkylation of indoles with β,β-disubstituted nitroalkenes was developed by using a nickel(II) perchlorate–bisoxazoline complex as a catalyst. A range of nitroalkenes and indoles participated in this reaction, affording chiral indole compounds bearing all-carbon quaternary stereocenters in excellent yields and with moderate to good enantioselectivities (up to 80% ee)
Iridium-catalyzed highly chemoselective and efficient reduction of nitroalkenes to nitroalkanes in water
作者:Dong Xu、Yang Chen、Changmeng Liu、Jiaxi Xu、Zhanhui Yang
DOI:10.1039/d1gc01907d
日期:——
An iridium-catalyzed highly chemoselective and efficient transfer hydrogenation reduction of structurally diverse nitroalkenes was realized at very low catalyst loading (S/C = up to 10000 or 20 000), using formic acid or sodium formate as a traceless hydride donor in water. Excellent functionality tolerance is also observed. The turnover number and turnover frequency of the catalyst reach as high as
在非常低的催化剂负载量(S/C = 高达 10000 或 20 000)下,使用甲酸或甲酸钠作为水中的无痕氢化物供体,实现了铱催化的高化学选择性和高效转移氢化还原结构多样的硝基烯烃。还观察到优异的功能耐受性。催化剂的周转次数和周转频率高达18 600和19 200 h -1, 分别。不需要惰性气氛保护。硝基烯烃的反应性取决于它们的取代模式,pH 值是实现完全转化和优异化学选择性的关键因素。产品的纯化通过简单的萃取实现,无需柱层析。还原过程在 10 000 S/C 比率下轻松放大到 10 g 规模。这种绿色还原在对映选择性氢化中的潜力已经得到证实。
Organocatalyzed Enantioselective
Synthesis of Nitroalkanes Bearing All-Carbon Quaternary
Stereogenic Centers through Conjugate Addition of Acetone Cyanohydrin
作者:Mariafrancesca Fochi、Alfredo Ricci、Luca Bernardi、Francesco Fini
DOI:10.1055/s-2008-1078496
日期:——
The first organocatalyzed phase-transfer enantioselective conjugateaddition of cyanide ion derived from acetone cyanohydrin to β,β'-disubstituted nitroolefins is reported. The reaction leads to the efficient formation of nitroalkanes bearing an all-carbonquaternarystereogeniccenter in up to 72% ee.
报道了第一个有机催化相转移对映选择性共轭加成从丙酮氰醇衍生的氰化物离子到 β,β'-二取代硝基烯烃。该反应导致有效形成具有高达 72% ee 的全碳四元立体中心的硝基烷烃。
Method for producing an optically active nitro compound
申请人:Carreira M. Erick
公开号:US20070037976A1
公开(公告)日:2007-02-15
An optically active nitro compound having two hydrogen atoms on its α-cabon atom and having β-asymmetric carbon atom can be produced by making α, β-unsaturated nitroolefin having a hydrogen atom on its α-cabon atom react with at least two organosilicon compounds having at lest one silicon-hydrogen bond in the molecule in the presence of an asymmetric copper complex, or react with an organosilicon compound having at least one silicon-hydrogen bond in the molecule in the presence of an asymmetric copper complex and water.
A copper-catalyzed cascade reaction for selective aerobic oxidative C−C bond cleavage of β-alkyl nitroolefins and subsequent oxidative amidation with amines or amides was reported. The reaction all exhibited high selectivities and gave the corresponding α-ketoamides with 66–88% yields. The mechanistic study revealed that the NO2-directed aerobic oxidative C−C bond cleavage occurred on more electron-rich