Sonogashira偶联,Pd(II)催化的羰基环化和苯并呋喃还原(Mg,MeOH,NH 4 Cl)的序列为反式-2-芳基-2,3-二氢苯并[ b ]呋喃提供了一种收敛的模块化合成途径。-3-羧酸盐,是许多具有生物活性的天然产物的结构特征。这种多用途的策略适用于抗HIV天然产物(+)-紫精酸的正式全合成。
[EN] LIQUID CRYSTAL COMPOUND COMPRISING TWO CONDENSED AND SUBSTITUTED RINGS<br/>[FR] COMPOSÉ DE CRISTAUX LIQUIDES COMPRENANT DEUX CYCLES CONDENSÉS ET SUBSTITUÉS
申请人:FUJI PHOTO FILM CO LTD
公开号:WO2005085222A1
公开(公告)日:2005-09-15
A new liquid crystal compound comprises two condensed and substituted rings. The ring preferably is a five-membered heterocyclic ring. The heterocyclic ring is preferably condensed with benzene ring or an aromatic six-membered heterocyclic ring. The benzene ring or the aromatic six-membered heterocyclic ring is preferably substituted with a group comprising a cyclic structure and a chain structure. The liquid crystal compound is advantageously used in preparation of a thin phase retarder, such as a wide-ranged l/4 plate, which gives inverse wavelength distribution. The phase retarder can be easily produced according to a simple process by using the new liquid crystal compound.
Rhodium‐Catalyzed Atroposelective Click Cycloaddition of Azides and Alkynes
作者:Linwei Zeng、Jiaming Li、Sunliang Cui
DOI:10.1002/anie.202205037
日期:2022.7.11
A rhodium-catalyzed enantioselective click cycloaddition of azides and alkynes for rapid and modular access to atropisomeric triazoles is reported. This click process features very mild reaction conditions, superior efficiency and enantioselectivity, broad substrate scope and facile scalability. The racemization study and further derivatizations demonstrate the good configurational stability of the