Disclosed are furochroman compounds of formula I
liquid-crystal media which contains the compounds of formula I, and the use of the media in electro-optical displays, in particular in VAN LCDs.
Benzochromene Derivatives for Use in Liquid Crystal Media and as Therapeutic Active Substances
申请人:Taugerbeck Andreas
公开号:US20090247620A1
公开(公告)日:2009-10-01
The present invention relates to benzochromene derivatives of the formula I
where the various parameters have the meaning indicated in the text, and to liquid-crystal media which comprise these compounds, and to the use of the media in electro-optical displays, in particular in TN, OCB, LCOS and/or IPS-LCDs, and to the use of the compounds and physiologically acceptable derivatives thereof as therapeutic active ingredients.
The present invention relates to benzochromene derivatives of the formula I
where the various parameters have the meaning indicated in the text, and to liquid-crystal media which comprise these compounds, and to the use of the media in electro-optical displays, in particular in VAN-LCDs, and to the use of the compounds and physiologically acceptable derivatives thereof as therapeutic active ingredients.
Diastereoselective Synthesis of Cyclopropanes from Carbon Pronucleophiles and Terminal Alkenes
作者:Min Ji Kim、Diana J. Wang、Karina Targos、Uriel A. Garcia、Alison F. Harris、Ilia A. Guzei、Zachary K Wickens
DOI:10.1002/anie.202303032
日期:——
A new protocol for diastereoselective cyclopropanation from unactivated alkenes and acidic carbon pronucleophiles is reported. The method is scalable and amenable to synthesis of medicinally relevant molecules.
Enantioconvergent Palladium‐Catalyzed Alkylation of Tertiary Allylic C−H Bonds
作者:Zhong‐Sheng Nong、Xin‐Ran Chen、Pu‐Sheng Wang、Xin Hong、Liu‐Zhu Gong
DOI:10.1002/anie.202312547
日期:2023.11.13
phosphoramidite-catalyzed intermolecular enantioconvergent alkylation of racemic tertiary allylic C−Hbonds provides facile access to a range of enantioenriched allylic compounds featuring quaternary carbon stereocenters. The deracemization has been accomplished through a rate-limiting cleavage of racemic tertiary allylic C−Hbonds to generate σ-allyl-Pd species, and the obtained E/Z-selectivity of σ-allyl-Pd species
Pd-手性亚磷酰胺催化的外消旋叔烯丙基 C-H 键的分子间对映会聚烷基化可以方便地获得一系列具有季碳立构中心的对映体富集的烯丙基化合物。去消旋化是通过外消旋叔烯丙基 C−H 键的限速裂解生成 σ-烯丙基-Pd 物质来完成的,并且所获得的σ-烯丙基-Pd 物质的E/Z选择性通过亲核试剂显着调节非对映选择性协调启用的 S N 2′-烯丙基化途径。