Mild and efficient palladium-catalyzed intramolecular direct arylation reactions
作者:Marc Lafrance、David Lapointe、Keith Fagnou
DOI:10.1016/j.tet.2008.01.057
日期:2008.6
been evaluated in the context of intramoleculardirect arylation reactions. Under the optimal conditions, arylation of simple arenes can be performed under very mild conditions, with heating to 50 °C. The role of the pivalic acid additive is rationalized by invoking a concerted palladation–deprotonation pathway where the pivalate is behaving as either an intramolecular base from the palladium metal or
Neocuproine–KOtBu promoted intramolecular cross coupling to approach fused rings
作者:Chang-Liang Sun、Yi-Fan Gu、Wei-Ping Huang、Zhang-Jie Shi
DOI:10.1039/c1cc13907j
日期:——
Polycycles can be produced with different linkages (A, B = O, N, C, S) by constructing biaryl CâC bonds vianeocuproineâKOtBu promoted cross coupling between CâXs and CâHs.
多环化合物可以通过构建联芳基C–C键,在二茂铜–KOtBu促进下,通过C–X和C–H之间的交叉偶联反应,利用不同的键合方式(A, B = O, N, C, S)来合成。
Ultrasound-promoted intramolecular direct arylation in a capillary flow microreactor
作者:Lei Zhang、Mei Geng、Peng Teng、Dan Zhao、Xi Lu、Jian-Xin Li
DOI:10.1016/j.ultsonch.2011.07.008
日期:2012.3
An intramoleculardirectarylation of various aryl bromides was performed using ultrasonic irradiation and a continuous flow capillary microreactor. The present procedure provided a higher functional group tolerance, ligand-free, milder reaction conditions and a shorter reaction time for the directarylation compared with the conventional methods. The ultrasonic irritation not only greatly promoted
carboxylic acid bearing three cyclohexylmethyl substituents at the α‐position, namely, tri(cyclohexylmethyl)acetic acid, is demonstrated to act as an efficient ligand source in Pd‐catalyzed intramolecularC(sp2)−H and C(sp3)−H arylation reactions. The reactions proceed smoothly under mild reaction conditions, even at room temperature due to the steric bulk of the carboxylate ligands, which accelerates the
Substituted 6H-DiBenzo[c,h]chromenes as estrogenic agents
申请人:Wyeth
公开号:US20030176491A1
公开(公告)日:2003-09-18
This invention provides estrogen receptor modulators of formula I, having the structure
1
wherein
R
1
, R
2
, R
3
, R
4
R
5
, R
6
, and R
7
are as defined in the specification, or a pharmaceutically acceptable salt thereof.