A general and efficient synthesis of substituted fluorenes and heterocycle-fused indenes containing thiophene or indole rings utilizing a Suzuki–Miyaura coupling and acid-catalyzed Friedel–Crafts reactions as key steps
作者:Guijie Li、Erjuan Wang、Haoyi Chen、Hongfeng Li、Yuanhong Liu、Peng George Wang
DOI:10.1016/j.tet.2008.07.021
日期:2008.9
A general and efficient synthesis of fluorenes or heterocycle-fused indenes including 3-thia-cyclopenta[a]indenes, 9-thia-indeno[1,2-a]indenes, 5,6-dihydroindeno[2,1-b]indoles has been developed. This methodology is realized by a multistep protocol involving first preparation of ortho-formylbiaryls through Suzuki–Miyaura coupling of o-bromobenzaldehydes with arylboronic acids or the coupling of aryl
芴或杂环稠合的茚基的一般有效合成方法,包括3-噻吩环戊[ a ]茚,9-噻吩[1,2- a ]茚,5,6-二氢茚并[ 2,1- b ]吲哚已经被开发出来。这种方法是由涉及的第一制备多步协议实现邻-formylbiaryls通过铃木-宫浦耦合的ø-溴苯甲醛与芳基硼酸的结合或芳基卤化物与2-甲酰基苯硼酸的偶联,然后进行Brignard加成反应或Lewis酸催化的Friedel-Crafts环化反应,形成所需的芴或茚环。该方法具有许多优点,例如产率高,选择性高,反应条件温和,起始原料容易获得等。
TMEDA-Assisted Effective Direct Ortho Arylation of Electron-Deficient <i>N</i>-Heteroarenes with Aromatic Grignard Reagents
作者:Fang-Fang Zhuo、Wen-Wen Xie、Yong-Xin Yang、Lei Zhang、Pei Wang、Rui Yuan、Chao-Shan Da
DOI:10.1021/jo400152f
日期:2013.4.5
the addition of TMEDA in toluene, aryl Grignards could effectively and site-specifically ortho-arylate electron-deficient heteroarenes under mild conditions. This endeavor successfully changed the old low-yielding reaction, aryl Grignard addition to N-heteroarenes, into an efficient procedure for heterobiaryls. The combination of the inexpensive aryl Grignards, TMEDA, the cost-free air, no use of any
Pd-Catalyzed Cross-Coupling of Highly Sterically Congested Enol Carbamates with Grignard Reagents via C–O Bond Activation
作者:Zicong Chen、Chau Ming So
DOI:10.1021/acs.orglett.0c01127
日期:2020.5.15
The palladium-catalyzed cross-coupling reaction of enol carbamates to construct highly sterically congested alkenyl compounds is presented for the first time. This protocol demonstrates the potential of using thermally stable and highly atom-economic enol electrophiles as building blocks in bulky alkene synthesis. This reaction accommodates a broad substrate scope with excellent Z/E isomer ratios,
CF<sub>3</sub>-Substituted semisquarate: a pluripotent building block for the divergent synthesis of trifluoromethylated functional molecules
作者:Y. Yamamoto、T. Kurohara、M. Shibuya
DOI:10.1039/c5cc06920c
日期:——
The first synthesis of a CF3-substituted semisquarate was accomplished via nucleophilictrifluoromethylation using CF3SiMe3 and subsequent rhenium-catalyzed allylic alcohol rearrangement. The short-step skeletal-divergent synthesis of trifluoromethylated functional molecules was successfully...
Novel Synthesis of the Hexahydroimidazo[1,5b]isoquinoline Scaffold: Application to the Synthesis of Glucocorticoid Receptor Modulators
作者:Hai-Yun Xiao、Dauh-Rurng Wu、Mary F. Malley、Jack Z. Gougoutas、Sium F. Habte、Mark D. Cunningham、John E. Somerville、John H. Dodd、Joel C. Barrish、Steven G. Nadler、T. G. Murali Dhar
DOI:10.1021/jm901551w
日期:2010.2.11
The first stereoselective synthesis of the hexahydroimidazo[1,5b]isoquinoline (HHII) scaffold as a surrogate for the steroidal A-B ring system is described. The structure - activity relationships of the analogs derived from this scaffold show that the basic imidazole moiety is tolerated by the glucocorticold receptor (GR) in terms of binding affinity, although the partial agonist activity in the transrepressive assays depends on the substitution pattern on the B-ring. More importantly, most compounds in the HHII series bearing a tertiary alcohol moiety on the B-ring are either inactive or significantly less active in inducing GR-mediated transactivation, thus displaying a "dissociated" pharmacology in vitro.