Copper(II) Acetate Promoted Oxidative Cyclization of Arylsulfonyl-o-allylanilines
摘要:
Tosyl-o-allylaniline 1 undergoes oxidative cyclization to produce tetracycle 2 upon treatment with Cu(OAc)(2) and Cs2CO3 at 120 degreesC. The scope of the reaction was extended to other N-sulfonylated aromatic systems.
Copper Catalyzed Enantioselective Intramolecular Aminooxygenation of Alkenes
作者:Peter H. Fuller、Jin-Woo Kim、Sherry R. Chemler
DOI:10.1021/ja806585m
日期:2008.12.31
methyleneoxy-functionalized dihydroindolines and pyrrolidines. Tetramethylaminopyridyl radical (TEMPO) serves as both the source of the oxygen and the stoichiometric oxidant. These reactions are catalyzed by copper(II) triflate, complexed with (4S,5R)-Bis-Phbox. The unprotected aminoalcohols can be obtained by sequential dissolving metal reductions of the N-S and O-N bonds.
本文报道了铜催化的烯烃的对映选择性分子内氨基氧化。这是对映选择性分子内烯烃氨基氧化过程的第一份报告。N-Arylsulfonyl-2-allylanilines 和 4-pentenylarylsulfonamides 以高产率和良好的对映选择性环化,提供新的手性亚甲氧基官能化二氢二氢吲哚和吡咯烷。四甲基氨基吡啶基(TEMPO)既是氧源又是化学计量氧化剂。这些反应由与 (4S,5R)-Bis-Phbox 络合的三氟甲磺酸铜 (II) 催化。未保护的氨基醇可以通过连续溶解 NS 和 ON 键的金属还原来获得。
<i>m</i>-CPBA-Mediated IntramolecularAminohydroxylation of<i>N</i>-Sulfonyl Aminoalkenes to Synthesize β-Hydroxyl Cyclic Amines
作者:Yan Yin、Hong Zhou、Guofeng Sun、Xichen Liu
DOI:10.1002/jhet.2169
日期:2015.9
diverse N‐sulfonyl‐protected aminoalkenes readily reacted with m‐CPBA to produce a series of β‐hydroxyl cyclicamines in high yields through intramolecular aminohydroxylation. This metal‐free and easy‐to‐handle synthetic methodology offered an environmentally friendly alternative to vicinal difunctionalization of alkenes.
Efficient Copper-Catalyzed Direct Intramolecular Aminotrifluoromethylation of Unactivated Alkenes with Diverse Nitrogen-Based Nucleophiles
作者:Jin-Shun Lin、Ya-Ping Xiong、Can-Liang Ma、Li-Jiao Zhao、Bin Tan、Xin-Yuan Liu
DOI:10.1002/chem.201303387
日期:2014.1.27
A mild, convenient, and step‐economical intramolecular aminotrifluoromethylation of unactivated alkenes with a variety of electronically distinct, nitrogen‐based nucleophiles in the presence of a simple copper salt catalyst, in the absence of extra ligands, is described. Many different nitrogen‐based nucleophiles (e.g., basic primaryaliphatic and aromaticamines, sulfonamides, carbamates, and ureas)
An efficient synthesis of 3-aryl-1-propenyl boronates from pinacol vinyl boronic ester and allyl-substituted aromatics by cross metathesis is reported. Although the allylbenzene derivatives are prone to isomerization reaction under metathesis conditions, we found that some ruthenium catalysts are effective for this methodology. This strategy thus provides an interesting alternative approach to alkyne
Catalytic Enantioselective Alkene Aminohalogenation/Cyclization Involving Atom Transfer
作者:Michael T. Bovino、Sherry R. Chemler
DOI:10.1002/anie.201109044
日期:2012.4.16
the synthesis of chiral 2‐bromo, chloro, and iodomethyl indolines and 2‐iodomethyl pyrrolidines (see scheme). Stereocenter formation is believed to occur by enantioselective cis aminocupration and CX bond formation is believed to occur by atom transfer. The ultility of the products as versatile synthetic intermediates was demonstrated, as was a radical cascade cyclization sequence.
已解决的问题:标题反应用于合成手性 2-溴、氯和碘甲基二氢吲哚和 2-碘甲基吡咯烷(参见方案)。立体中心的形成被认为是通过对映选择性顺式 氨基氧化发生的,C X 键的形成被认为是通过原子转移发生的。证明了产品作为多功能合成中间体的实用性,以及自由基级联环化序列。