A Facile Synthesis of 2H-Chromenes and 9-Functionalized Phenanthrenes through Reactions between α,β-Unsaturated Compounds and Arynes
作者:Tiexin Zhang、Xian Huang、and Luling Wu
DOI:10.1002/ejoc.201200042
日期:2012.6
Facile syntheses of 2H-chromenes or 9-functionalizedphenanthrenes under mild conditions in moderate to good yields have been developed. They each involve annulations of arynes with α,β-unsaturatedcompounds bearing different electron-withdrawing groups (EWGs). Depending on the natures of the different EWGs, the reactions proceed by different pathways: enals react with arynesthrough a tandem [2+2]
Synthesis and Cytotoxicity Evaluation of New 3-substituted 4-(4-methyloxy phenyl)-1<i>H</i>-Pyrrole Derivatives
作者:Xiaoping Zhan、Lan Lan、Yuankui Zhang、Jian Chen、Kai Zhao、Shuai Wang、Yuxuan Xin、Zhenmin Mao
DOI:10.1002/bkcs.10653
日期:2016.2
A new series of 3‐substituted 4‐(4‐methyloxy phenyl)‐1H‐pyrrole derivatives were synthesized and biologically evaluated for potential anticancer activity. Fifteen targeted compounds showed high selectivity toward normal cells and cancer cells: that is, all targeted compounds had no obvious cytotoxicity toward normal human cells (HUVEC and NIH/3T3), but some compounds exhibited broad‐spectrum proliferation
Visible light catalyzed reaction of α-bromochalcones with chalcones: direct access to the urundeuvine scaffold
作者:Bhupal Singh Karki、Mukund M. D. Pramanik、Ruchir Kant、Namrata Rastogi
DOI:10.1039/c8ob01881b
日期:——
The α-keto vinyl radicals generated from α-bromochalcones under visiblelightphotoredoxcatalyzed conditions were trapped by chalcones. The subsequent intramolecular cyclization of the resulting benzylic radicals led to the synthesis of dihydronaphthalenes, which were conveniently oxidized to the corresponding naphthalenes. The strategy was adopted successfully for synthesizing derivatives of urundeuvine
Organocatalyzed Biomimetic Selective Reduction of C=C Double Bonds of Chalcones
作者:Vishwa Deepak Tripathi、Anand Mohan Jha
DOI:10.14233/ajchem.2018.21480
日期:——
Reduction of carbon-carbon doublebonds in compounds such as carbonyls, imines, and olefins are of great importance in chemistry, biology and as well as from the industrial perspective. Reduction of double bond-containing such compounds and various other α,β-unsaturated systems via hydrogenation often involves the use of metal catalysts [1,2] or stoichiometric amount of metal hydrides [3,4]. Several
Divergent Strategy for the Diastereoselective Synthesis of the Tricyclic 6,7-Diaryltetrahydro-6<i>H</i>-benzo[<i>c</i>]chromene Core via Pt(IV)-Catalyzed Cycloaddition of <i>o</i>-Quinone Methides and Olefin Ring-Closing Metathesis
A divergent strategy for the synthesis of the tricyclic 6,7-diaryltetrahydro-6H-benzo[c]chromene core was successfully developed. The 2,3-trans, 2,4-cis trisubstituted chroman moiety was formed via highly efficient and stereoselective Pt(IV)-catalyzed cycloadditionreactions of the corresponding quinone methides with chalcones. Subsequent steps provided the common diene alcohol, which underwent BF3·Et2O-mediated
成功开发了一种合成三环6,7-二芳基四氢-6 H-苯并[ c ]色烯核心的不同策略。2,3-反式,2,4-顺式三取代的苯并二氢吡喃部分是通过相应的醌甲基化物与查耳酮的高效且立体选择性的Pt(IV)催化的环加成反应形成的。随后的步骤提供了普通的二烯醇,其经过BF 3 ·Et 2 O介导的Et 3 SiH还原和使用Ru(II)催化剂进行的烯烃闭环复分解(RCM)。最后两个步骤的顺序为使C6和C10a处的立体化学结果多样化提供了一种方法。