Photoactuators based on the dynamic molecular crystals of naphthalene acrylic acids driven by stereospecific [2+2] cycloaddition reactions
作者:Jiaxi Liu、Kaiqi Ye、Yanbing Shen、Jiang Peng、Jingbo Sun、Ran Lu
DOI:10.1039/c9tc06689f
日期:——
needle-like crystals of 1FNaAA, and the slice-like crystals of 1ClNaAA and 1BrNaAA show bending, cracking, coiling, rotating and twisting triggered by 365 nm light. It is found that stereospecific [2+2] cycloadditionreactions take place in the crystals to afford one stereoisomer of β-type cyclobutanes, since 1FNaAA, 1ClNaAA, 1BrNaAA and 6BrNaAA pack in a head-to-head mode, which satisfies the Schmidt's
The synthesis of 12-fluoro-7-methyl- and 7-fluoro-benz[a]anthracene
作者:J. Blum、F. Grauer、E.D. Bergmann
DOI:10.1016/s0040-4020(01)82885-4
日期:1969.1
and at the 12-position of 7-methylbenz[a]anthracene on the carcinogenic properties of these hydrocarbons, the title compounds have been prepared by photocyclization of 1-(1-f1uoro-2-naphthyl)-2-(o-iodophenyl)ethylene and 1-(4-fluoro-1-methyl-2-naphthyl)-2-(o-iodophenyl)ethylene, respectively.
isomer by deprotonation-triggered heavy halogen migration, was converted into 3,3'-dibromo-1,1'-difluoro-2,2'-binaphthyl (I) by consecutive treatment with lithium diisopropylamide, copper(II) bromide and nitrobenzene. The dilithiated intermediate generated from the atropisomer I by treatment with 2 equiv. of butyllithium reacted with a variety of electrophiles to afford products such as, diacid or bis(phosphane)
1-Fluoro-2-(triethylsilyl)naphthalene 和其他 1-fluoronaphthalene 衍生物。证明在 2 位带有抗金属化取代基的化合物对碱攻击是完全惰性的。3-Bromo-1-fluoronaphthalene,容易制备。通过去质子化引发的重卤素迁移,从 2-溴异构体转化为 3,3'-二溴-1,1'-二氟-2,2'-联萘 (I),通过连续用二异丙基氨基锂、铜 (II) 处理) 溴化物和硝基苯。通过用2当量处理从阻转异构体I产生的二锂化中间体。丁基锂与各种亲电试剂反应得到产物,例如二酸或双(磷烷)衍生物。. 高产。后者compd。也以直接的方式从(4-氟-2-萘基)二苯基氧化膦获得。没想到,3,3' -dibromobinaphthyl I 或其 3,3'-二碘类似物适用于单边但仅适用于双面卤素/金属置换。[在 SciFinder (R) 上]
Tuning the Peri Effect for Enantioselectivity: Asymmetric Hydrogenation of Unfunctionalized Olefins with the BIPI Ligands
作者:Carl A. Busacca、Bo Qu、Nicole Grět、Keith R. Fandrick、Anjan K. Saha、Maurice Marsini、Diana Reeves、Nizar Haddad、Magnus Eriksson、Jiang-Ping Wu、Nelu Grinberg、Heewon Lee、Zhibin Li、Bruce Lu、Dajun Chen、Yaping Hong、Shengli Ma、Chris H. Senanayake
DOI:10.1002/adsc.201201104
日期:2013.5.17
region. The development of ligands optimized for asymmetrichydrogenation of the challenging unfunctionalizedolefin substrate class is described. The naphthyl peri position, C‐8, has been identified as a critical stereocontrol element in the design of these ligands. Highly enantioselective ligands suitable for hydrogenation of tri‐ and tetrasubstitutedolefins are detailed.
[EN] 2,4,5-TRI-SUBSTITUTED AZOLE-BASED CASEIN KINASE 1 INHIBITORS AS INDUCERS FOR CARDIOMYOGENESIS<br/>[FR] INHIBITEURS DE LA CASÉINE KINASE 1 À BASE D'AZOLE 2,4,5-TRI-SUBSTITUÉ EN TANT QU'INDUCTEURS DE LA CARDIOMYOGENÈSE
申请人:AGENCY SCIENCE TECH & RES
公开号:WO2015119579A1
公开(公告)日:2015-08-13
This invention relates to a method for inducing or enhancing the differentiation of pluripotent stem cells into cardiomyocyte via casein kinase 1 inhibition said method comprising culturing the stem cells in the presence of a medium comprising a casein kinase 1 inhibitor of the formula (I) or (II) or a stereoisomer, tautomer, or a salt thereof wherein R1, R2 and R3 independently from another represent hydrogen, optionally substituted alkyl, alkenyl, alkynyl, heterocyclyl, heteroaryl or aryl; X represents NR4, O or S; and R4 represents hydrogen, optionally substituted alkyl, alkenyl, alkynyl, heterocyclyl, heteroaryl or aryl. The method can be used in the late phase of stem cell differentiation and in the compounds of formula (I) or (II) in combination with other small molecules can lead to especially high differentiation of stem cells into cardiomyocytes. The invention further relates to novel compounds which can be used in the method of the invention and kits for stem cell differentiation.