Iron-Ligand Coordination in Tandem Radical Cyclizations: Synthesis of Benzo[b]thiophenes by a One-pot Reaction of Iron 1,3-Diketone Complexes with 2-Thiosalicylic Acids
作者:Sharon Lai-Fung Chan、Kam-Hung Low、Chen Yang、Samantha Hui-Fung Cheung、Chi-Ming Che
DOI:10.1002/chem.201100377
日期:2011.4.18
Iron—the mediator: 1,3‐Diketone ligands coordinated to iron undergo unprecedented tandemreactions with 2‐thiosalicylic acids to give 2‐substituted 3‐hydroxylbenzo[b]thiophenes in up to 98 % yield. A similar reaction with 2‐mercaptonicotinic acid gave a thieno[2,3‐b]pyridine derivative in 72 % yield (see scheme). A mechanism involving redox transformation and tandemradicalcyclization of the coordinated
铁—介体:与铁配位的1,3-二酮配体与2-硫代水杨酸进行空前的串联反应,生成2-取代的3-羟基苯并[ b ]噻吩,收率高达98%。与2-巯基烟碱酸的类似反应得到噻吩并[2,3- b ]吡啶衍生物,产率为72%(参见方案)。提出了涉及配体的氧化还原转化和串联自由基环化的机理。
Copper-catalyzed domino synthesis of multi-substituted benzo[<i>b</i>]thiophene through radical cyclization using xanthate as a sulfur surrogate
The Cu-catalyzed domino synthesis of multi-substituted benzo[b]thiophene through radical cyclization of 2-iodophenyl ketones was developed using xanthate as a sulfur surrogate. This method was extended to obtain tetracyclic Lupinalbin analogues through double C–S/C–O bond formation by changing the substituents. The products were converted to a HTI photoswitch, benzothiophene-fused flavone.
以黄原酸酯为硫代物,通过2-碘苯基酮的自由基环化反应,开发了铜催化的多取代苯并[ b ]噻吩的多米诺骨牌合成。通过扩展取代基,通过双C-S / C-O键形成,扩展了该方法以获得四环卢比那滨类似物。将产物转化为HTI光开关,苯并噻吩融合的黄酮。
5,11-dioxa-benzo[b]fluoren-10-one and 5-oxa-11-thia-benzo[b]fluoren-10-ones as estrogenic agents
申请人:Wyeth
公开号:US20020183310A1
公开(公告)日:2002-12-05
This invention provides estrogen receptor modulators of formula 1, having the structure
1
wherein
X, Y
1
, Y
2
, Y
3
, Y
4
, Z
1
, Z
2
, Z
3
, and Z
4
are as defined in the specification, or a pharmaceutically acceptable salt thereof.
A highly efficient, one-pot synthesis of benzo[b]fluoren-10-ones
作者:Michael D. Collini、Chris P. Miller
DOI:10.1016/s0040-4039(01)01828-7
日期:2001.11
5,[1-Dioxa- and 5-oxa-1]-thiabenzo[b]fluoren-10-ones were prepared via a one-pot procedure initiated by the reaction of salicylates or thiasalicylates with ortho fluoro-alpha -bromoacetophenones in the presence of cesium carbonate. The reactions proceeded in good yield and the final products were obtained without chromatography. The reaction presumably proceeds via a sequential intermolecular alkylation, intramolecular acylation sequence concluded by an intramolecular, ipso-fluoro substitution. (C) 2001 Elsevier Science Ltd. All rights reserved.