Synthesis of new methylated thieno[2,3-<i>a</i>] and [3,2-<i>b</i>]carbazoles by reductive cyclization of 6-(2′-Nitrophenyl)benzo[<i>b</i>]thiophenes obtained by palladium-catalyzed cross-coupling isabel
作者:C. F. R. Ferreira、Maria-João R. P. Queiroz、Gilbert Kirsch
DOI:10.1002/jhet.5570380334
日期:2001.5
[3,2-b]carbazoles (5) (R=H) was achieved by a palladium-catalyzed cross-coupling, intramolecular reductive cyclization sequence of reactions. The cyclization precursors 6-(2′-nitrophenyl)benzo[b]thiophenes (3) were obtained by Suzuki cross-coupling of 6-boronated methylbenzo[b]thiophenes intermediates (2) with 2-bromo or iodonitrobenzene. The boronated intermediates (2) were prepared via bromine-lithium
新的甲基化噻吩并[2,3-a]和[3,2-b]咔唑(5)(R = H)的合成是通过钯催化的交叉偶联,分子内还原环化反应来实现的。通过将6-硼代甲基苯并[ b ]噻吩中间体(2)与2-溴或碘硝基苯进行Suzuki交叉偶联,得到环化前体6-((2'-硝基苯基)苯并[b]噻吩(3)。硼化中间体(2)的制备是通过溴-锂交换,然后进行硼金属转移,并使用Pd(OAc)2原位偶联,从而从6-溴苯并[ b ]硫代苯( 1)到环化前体(3)。在还原环化步骤中,还获得了N-乙基噻吩并咔唑(5)(R = Et)。为了避免形成亚磷酸三乙酯的量和反应时间,已经进行了一些实验。
SEPARATIONS USING BORON CONTAINING HYDROCARBON SPONGES
申请人:UNIVERSITY OF IOWA RESEARCH FOUNDATION
公开号:US20200255454A1
公开(公告)日:2020-08-13
The invention provides a compound of formula (I):
or a salt thereof, wherein R
1
and R
2
have any of the values defined in the specification, as well as methods of using such compounds and salts to separate an aryl compound from a mixture.
Separations using boron containing hydrocarbon sponges
申请人:UNIVERSITY OF IOWA RESEARCH FOUNDATION
公开号:US10889601B2
公开(公告)日:2021-01-12
The invention provides a compound of formula (I):
or a salt thereof, wherein R1 and R2 have any of the values defined in the specification, as well as methods of using such compounds and salts to separate an aryl compound from a mixture.