Divergent Copper‐salt‐controlled Reactions of Donor‐Acceptor Cyclopropanes and
N
‐Fluorobenzene Sulfonimide: Access to the 1,3‐Haloamines and Aminoindanes
摘要:
AbstractWe herein report a method for divergent copper salt controlled reactions of donor‐acceptor cyclopropanes and N‐fluorobenzene sulfonimide (NFSI). Specifically, in the presence of CuX2 (X=Cl, Br), the cyclopropanes underwent formal umpolung 1,3‐aminohalogenation bifunctionalization via a free radical mediated ring‐opening process to afford 1,3‐aminochlorination and 1,3‐aminobromination products in moderate to good yields. In addition, by using CuI as a catalyst, we synthesized various aminoindane derivatives via 1,3‐aminoarylation cyclization of D‐A cyclopropanes, the reactions involved a free radical mediated ring‐opening and subsequent ring expansion via C−H bond activation.
已经开发出一种通用的方法,可通过类似S N 2的反应,将叠氮离子与各种供体-受体环丙烷开环。这种高度区域选择性和立体选择性的过程是通过亲核攻击环丙烷的更取代的C2原子进行的,该中心的构型完全反转。DFT计算结果支持S N2机理,证明环丙烷的相对实验反应性与计算出的能垒之间具有良好的定性相关性。该反应为多种多官能叠氮化物提供了一种简单的方法,产率高达91%。这些叠氮化物具有很高的合成效用,并参与了面向多样性的合成,这是通过已开发的将其转变为五元,六元和七元N杂环以及复杂的环状化合物的多径策略证明的。包括天然产物和药物,如(-)-尼古丁和阿托伐他汀。
and an operationally simple Palladium-catalyzed domino reaction for the synthesis of N-aryl quinolinone-3-carboxylate derivatives has been developed via the reaction between diethyl 2-(2-bromobenzylidine) malonate and anilines. These newly synthesized compounds exhibited good to moderate anti-proliferative activity with GI50 values ranging from 0.41 µM to 45.77 µM. Among them, compounds 6j, 6k and 6m
the addition to various unsaturated carbonyl compounds, while calcium triflimide [Ca(NTf2)2] efficiently catalyzed the addition to nitroolefins. Friedel–Crafts alkylation of indole and its derivatives with a variety of electron-deficient alkenes catalyzed by Mg and Ca salts has been studied. The dependence of the results on the nature of the starting olefins, substituents on indole, and Michael acceptors
Cascade One-Pot Synthesis of Indanone-Fused Cyclopentanes from the Reaction of Donor-Acceptor Cyclopropanes and Enynals <i>via</i>
a Sequential Hydrolysis/Knoevenagel Condensation/[3+2] Cycloaddition
作者:Jiantao Zhang、Huanfeng Jiang、Shifa Zhu
DOI:10.1002/adsc.201700345
日期:2017.9.4
to construct indanone‐fused cyclopentanes via a sequential hydrolysis/Knoevenagelcondensation/[3+2] cycloaddition is reported. The desired indanone‐fused cyclopentanes were obtained in good yields. This method features mild reaction conditions and broad substrate scope, which render it very appealing to chemists for the synthesis of complex molecules containing an indanone‐fused cyclopentane moiety
Allenylphosphonates/Allenylphosphine Oxides as Intermediates/Precursors for Intramolecular Cyclization Leading to Phosphorus-Based Indenes, Indenones, Benzofurans, and Isochromenes
作者:K. V. Sajna、K. C. Kumara Swamy
DOI:10.1021/jo300705f
日期:2012.6.15
Utilizing internally available functional groups, a simple protocol for the efficient synthesis of phosphorus-based indenes, indenones, benzofurans, and isochromenes via intramolecular cyclization of allene intermediates/precursors is generated; the latter intermediates/precursors are conveniently obtained through aldehyde-, alkylidene-, and hydroxyl-functionalized propargyl alcohols and PIII–Cl precursors
利用内部可用的官能团,产生了一个简单的方案,用于通过丙二烯中间体/前体的分子内环化有效合成磷基茚满,茚满,苯并呋喃和异色酮;后者的中间体/前体可通过醛,亚烷基和羟基官能的炔丙醇和P III -Cl前体方便地获得。X射线晶体学已明确证实了关键产品的结构。
To stay as allene or go further? Synthesis of novel phosphono-heterocycles and polycyclics <i>via</i> propargyl alcohols
作者:Venu Srinivas、K. V. Sajna、K. C. Kumara Swamy
DOI:10.1039/c1cc10230c
日期:——
Novel (tetrahydro)dibenzazepines, N-hydroxyindolinones and polycyclic compounds are generated by a simple reaction of a chlorophosphite with functionalized propargyl alcohols.