A Metal-Free Oxidation of Benzo[c]chromen to Benzo[c]chromen-6-ones by t-Butyl Hydroperoxide in the Presence of Potassium Iodide
摘要:
An effective and eco-friendly oxidation method for the synthesis of benzo[c]chromen-6-ones is described. The condition constitutes 6 molar ratio TBHP, catalytic KI and pyridine in acetonitrile as the solvent. Altogether, 16 structurally diverse substituted benzo[c]chromen-6-ones were prepared through this protocol from corresponding benzo[c]chromenes in excellent yields.
Synthesis of substituted 6H-benzo[c]chromenes: a palladium promoted ring closure of diazonium tetrafluoroborates
摘要:
A highly efficient palladium-catalysed phenyl diazonium tetrafluoroborate participation of C-H activation ring closure protocol has been developed. A series of 6H-benzo[c]chromenes have been synthesized by intramolecular cyclization of ortho diazonium salts tetrafluoroborate of benzyloxyphenyl (Method A), or phenoxymethyl phenyl (Method B). The transformation allows the synthesis of 6H-benzo[c]chromenes with a wide variety of functional groups and substitution patterns from simple and easily accessible precursors. Crown Copyright (c) 2012 Published by Elsevier Ltd. All rights reserved.
Organic Photoredox Catalysis for Pschorr Reaction: A Metal-Free and Mild Approach to 6H-Benzo[c]chromenes
作者:Gaofeng Feng、Jing-Yao He、Qi-Fan Bai、Chengan Jin
DOI:10.1055/s-0037-1610279
日期:2018.10
under mild conditions by using eosinY as a photoredox catalyst and acetonitrile as the solvent. The diazonium salts can be either preformed or generated in situ from the corresponding amines with t -BuONO. The process is amenable to gram-sale synthesis of 6 H -benzo[ c ]chromenes, which can be further transformed into both 6 H -benzo[ c ]chromen-6-ones through oxidation or to 6 H -benzo[ c ]chromen-6-amine
已开发出一种方便的有机光氧化还原 Pschorr 反应,为 6 H-苯并 [c] 色烯开辟了一条合成路线。该过程可以在温和的条件下通过使用曙红Y作为光氧化还原催化剂和乙腈作为溶剂进行。重氮盐可以由相应的胺与 t-BuONO 预先形成或原位生成。该工艺适用于6 H-苯并[ c ]色烯的克销售合成,其可以通过氧化进一步转化为6 H-苯并[ c ]色烯-6-酮或6 H-苯并[ c ]色烯-6-胺通过 sp 3 C-H 键胺化。该协议为合成 6 H-苯并 [c] 铬库提供了一条有吸引力的途径。
Synthesis of 6<i>H-</i>Benzo[<i>c</i>]chromene Scaffolds from <i>O</i>-Benzylated Phenols through a C–H Sulfenylation/Radical Cyclization Sequence
作者:Steve Karreman、Simon B. H. Karnbrock、Sebastian Kolle、Christopher Golz、Manuel Alcarazo
DOI:10.1021/acs.orglett.1c00087
日期:2021.3.19
S-Aryl dibenzothiophenium salts, obtained through a highly regioselective C–H sulfenylation of o-benzyl-protected phenols, are used as precursors of 6H-benzo[c]chromenes. The reaction starts with a photocatalytically triggered single-electron transfer to the sulfonium salt, which promotes the formation of an arylradical via selective mesolitic cleavage of the S–Arexo bond. Mechanistic studies reveal
S-芳基二苯并噻吩鎓盐是通过邻苯甲基保护的苯酚的高区域选择性 C-H 亚磺酰化获得的,用作 6 H-苯并[ c ]色烯的前体。该反应从光催化触发的单电子转移到锍盐开始,这通过选择性中间体裂解 S-Ar外键促进芳基自由基的形成。机理研究表明,这种最初的自由基物种遵循动力学有利的 5-exo-trig 途径循环。随后的环扩展,有利于重芳构化,提供所需的三环系统。
POLYMER COMPOUND CONTAINING NITROGEN-CONTAINING HETEROCYCLIC STRUCTURE, AND COMPOSITION, SOLUTION, THIN FILM AND POLYMER LIGHT-EMITTING ELEMENT EACH CONTAINING SAME
申请人:Ishii Yusuke
公开号:US20110210322A1
公开(公告)日:2011-09-01
A polymer compound having a repeating unit represented by formula (1-0):
wherein in formula (1-0), ring A
01
and ring A
02
are the same or different and each represents an aromatic hydrocarbon ring that is optionally substituted; and X
10
and X
20
are the same or different and each represents a hydrogen atom or a substituent, provided that at least one of X
10
and X
20
is a group represented by formula (2-0):
wherein in formula (2-0), Z
10
, Z
20
and Z
30
are the same or different and each represents —N═ or —CH═, provided that at least two of Z
10
, Z
20
and Z
30
are —N═; L
0
represents an arylene group or a single bond; and Ar
10
and Ar
20
are the same or different and each represents an aryl group, provided that the total carbon number of the groups represented by Ar
10
, Ar
20
and L
0
is 24 or more.