已开发出使用 SF 5 Cl 的铜催化 1,3-烯炔区域发散型氯五氟磺酰化策略。区域选择性由 1,3-烯炔的结构和取代模式决定,从而能够轻松获得三类含 SF 5的产品:炔丙基氯、1,3-二烯和丙二烯。反应系统涉及自由基物质,其中氯原子从 SF 5 Cl 转移到碳自由基被认为是主要途径。通过简单的官能团转换可以合成不同类型的 SF 5 - 结构单元。
Enhancement of EGFR tyrosine kinase inhibition by C–C multiple bonds-containing anilinoquinazolines
摘要:
A series of 4-anilinoquinazolines with C-C multiple bond substitutions at the 6-position were synthesized and investigated for their potential to inhibit epidermal growth factor receptor (EGFR) tyrosine kinase activity. Among the compounds synthesized, alkyne 6d and allenes 7d and 7f significantly inhibited EGFR tyrosine kinase activity. These compounds inhibited EGF-mediated phosphorylation of EGFR in A431 cells, resulting in cell-cycle arrest and apoptosis induction. The C-C multiple bonds substituted at the C-6 position of the anilinoquinazoline framework were essential for the significant inhibitory activity. Compounds with long carbon chains (n = 3-6), such as 6c-f, 7c-f, 11, and 12, displayed prolonged inhibitory activity. (C) 2009 Elsevier Ltd. All rights reserved.
via the palladium-catalyzed [4+2] homobenzannulation of conjugatedenynes 4 was developed. In all cases, the reactions proceeded in regiospecific manner, affording the disubstituted styrenes, bearing various functional groups at the 2 and 6 positions of the benzene ring, as a single reaction product in good to excellent yields. Initial attempts at cross-cycloaddition of two different enynes indicated
Tandem catalysis for asymmetric coupling of ethylene and enynes to functionalized cyclobutanes
作者:Vinayak Vishnu Pagar、T. V. RajanBabu
DOI:10.1126/science.aat6205
日期:2018.7.6
chiral cyclobutane products. Transformation of simple precursors into structurally complex cyclobutanes, present in many biologically important natural products and pharmaceuticals, is of considerable interest in medicinal chemistry. Starting from 1,3-enynes and ethylene, both exceptionally inexpensive starting materials, we report a cobalt-catalyzed route to vinylcyclobutenes, as well as the further
cycloguanidination process using CuCl as catalyst and diaziridinimines as the nitrogen source. A variety of conjugated dienes, trienes, and terminal olefins can be effectively diaminated under mild reaction conditions. For dienes and trienes, the reaction occurs at the terminal double bond with high regioselectivity.
Enantioselective Reductive Coupling of 1,3-Enynes to Glyoxalates Mediated by Hydrogen: Asymmetric Synthesis of β,γ-Unsaturated α-Hydroxy Esters
作者:Young-Taek Hong、Chang-Woo Cho、Eduardas Skucas、Michael J. Krische
DOI:10.1021/ol7015548
日期:2007.9.1
Catalytic hydrogenation of 1,3-enynes 1a-8a in the presence of ethyl glyoxalate at ambient pressure and temperature using a rhodium catalyst modified by (R)-(3,5-tBu-4-MeOPh)-MeO-BIPHEP results in highly regio- and enantioselective reductivecoupling to furnish the corresponding alpha-hydroxy esters 1b-8b. As demonstrated by the elaboration of alpha-hydroxy ester 1b, the terminal and internal olefin
A Sonogashira cross-coupling, nucleophilic substitution and elimination cascade reaction allows the synthesis of otherwise difficult to obtain linear dienynes, in moderate to high yields. Ionic liquids are suitable recyclable solvents for the reaction. This synthetic strategy opens new ways to prepare highly conjugated alkenes and alkynes.