Ring Opening of Donor-Acceptor Cyclopropanes with the Azide Ion: A Tool for Construction of N-Heterocycles
作者:Konstantin L. Ivanov、Elena V. Villemson、Ekaterina M. Budynina、Olga A. Ivanova、Igor V. Trushkov、Mikhail Ya. Melnikov
DOI:10.1002/chem.201405551
日期:2015.3.23
general method for ringopening of various donor–acceptor cyclopropanes with the azide ion through an SN2‐like reaction has been developed. This highly regioselective and stereospecific process proceeds through nucleophilic attack on the more‐substituted C2 atom of a cyclopropane with complete inversion of configuration at this center. Results of DFT calculations support the SN2 mechanism and demonstrate
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。
Reversal of regioselectivity in reactions of donor–acceptor cyclopropanes with electrophilic olefins
Reactivity of donor–acceptor cyclopropanes towards nucleophiles and electrophiles is determined by the specific philicity of the carbon atoms originating from the strong polarization of the central C–C bond. Herein, we report that vitamin B12 catalysis enables the transformation of an initially electrophilic center into a nucleophilic radical that reacts with SOMOphiles. This radical-based strategy
供体 - 受体环丙烷对亲核试剂和亲电试剂的反应性由源自中心 C-C 键的强极化的碳原子的特定亲水性决定。在此,我们报道维生素 B 12催化能够将最初的亲电中心转变为与 SOMophiles 反应的亲核自由基。这种基于自由基的策略逆转了标准的区域选择性,从而补充了经典方法。
Reaction of Corey Ylide with α,β-Unsaturated Ketones: Tuning of Chemoselectivity toward Dihydrofuran Synthesis
作者:Alexey O. Chagarovsky、Ekaterina M. Budynina、Olga A. Ivanova、Elena V. Villemson、Victor B. Rybakov、Igor V. Trushkov、Mikhail Ya. Melnikov
DOI:10.1021/ol500877c
日期:2014.6.6
A straightforward, efficient, and reliable approach to synthetically valuable 2,3-dihydrofurans via a reaction between Corey ylide and α,β-unsaturated ketones has been developed. The use of simple and widely spread starting materials as well as mild reaction conditions and scalability provide a broad scope of 2,3-dihydrofurans.
Stereocontrolled [3+2] Cycloaddition of Donor–Acceptor Cyclopropanes to Iminooxindoles: Access to Spiro[oxindole-3,2′-pyrrolidines]
作者:Andrey A. Akaev、Stanislav I. Bezzubov、Victor G. Desyatkin、Nataliya S. Vorobyeva、Alexander G. Majouga、Mikhail Ya. Melnikov、Ekaterina M. Budynina
DOI:10.1021/acs.joc.8b03208
日期:2019.3.15
with ester, keto, nitro, cyano etc. groups, and N-unprotected iminooxindoles. The stereospecificity of the initial SN2-like imine attack on a cyclopropane molecule together with a high diastereoselectivity of further C–C bond formation facilitate a rapid access to spiro[oxindole-3,2′-pyrrolidines] in their optically active forms. Preliminary in vitro testing of the synthesized compounds against LNCaP
通过将供体-受体环丙烷的[3 + 2]-环加成到电子贫乏的酮亚胺(亚氨基氧吲哚)上,开发了螺环[oxindole-3,2'-吡咯烷]的新型立体控制组装。该方法可有效利用常用的供体-受体环丙烷,它们经酯,酮,硝基,氰基等基团和N-未保护的亚氨基吲哚官能化。最初的S N 2样亚胺攻击环丙烷分子的立体定向性以及进一步C-C键形成的高非对映选择性,有助于快速接近其光学活性形式的螺[oxindole-3,2'-吡咯烷]。初步体外 对合成的化合物针对LNCaP(p53 +)和PC-3(p53-)细胞的测试显示,对于几种化合物作为MDM2-p53相互作用的抑制剂,它们具有很好的抗增殖活性和p53选择性指数。
Regioselective Hydrogenolysis of Donor–Acceptor Cyclopropanes with Zn-AcOH Reductive System
作者:Konstantin L. Ivanov、Elena V. Villemson、Gennadij V. Latyshev、Stanislav I. Bezzubov、Alexander G. Majouga、Mikhail Ya. Melnikov、Ekaterina M. Budynina
DOI:10.1021/acs.joc.7b01549
日期:2017.9.15
convenient low-cost method for regioselective ring-opening of donor–acceptor cyclopropanes with the Zn-AcOH reductive system was developed. The general character of the method was displayed via efficient reduction of a representative series of 2-(het)arylcyclopropane-1,1-diesters as well as donor–acceptor cyclopropanes with other types of electron-withdrawing activating groups. This method opens a rapid