前所未有的不对称铜催化将ZnEt 2(Z n Bu 2)添加到五氟醚C 5 H 4(CHAr)(Ar = 2-MeOPh和相关物质)的环外CC键中,导致对映体富集(最多93个) :7 er)环戊二烯基配体(C 5 H 4 CHEtAr;缩写为Cp R)。用手性亚磷酰胺配体和磷酸盐添加剂促进铜催化剂对于实现可接受的对映选择性和反应速率都是至关重要的。已经制备了对映体Cp R 2 TiCl 2络合物。(S,S)异构体在24小时时对胰腺癌,乳腺癌和结肠癌细胞系的活性是其(R,R)对映体的两倍。
Acetylene gas has been applied as a feedstock under transition-metal catalysis and photo-redox conditions to produce important chemicals including terminal alkynes, fulvenes, and fluorinated styrene compounds. The reaction discovery process was accelerated through the use of “stop-flow” micro-tubing reactors. This reactor prototype was developed by joining elements from both continuous micro-flow and
An efficient catalytic method for fulvene synthesis
作者:Necdet Coşkun、Ihsan Erden
DOI:10.1016/j.tet.2011.09.036
日期:2011.11
added water and solvent on the condensation of carbonyl compounds with cyclopentadiene in the presence of secondary amines were investigated. Based on these studies, a new efficient and green synthesis of fulvenes was developed.
fourth titanocene 3d was elucidated through a DFT calculation. All four titanocenes had their cytotoxicity investigated through preliminary in vitro testing on the LLC-PK (pig kidney epithelial) cell line in order to determine their IC50 values. Titanocenes 3a–d were found to have IC50 values of 97, 159, 88 and 253 μM, respectively. All four titanocene derivatives show significant cytotoxicity improvement
A series of novel titanocene-complexes has been prepared and evaluated for their growth regulatory effects in MCF7 and SkBr3 breast cancer cells. The capability of some of these compound to elicit relevant repressive effects on cancer cell growth could be taken into account towards novel pharmacological approaches in cancer therapy. (C) 2013 Elsevier Ltd. All rights reserved.
A Practical and General Diels–Alder Reaction of Pentafulvenes with Arynes
作者:Sachin Suresh Bhojgude、Trinadh Kaicharla、Anup Bhunia、Akkattu T. Biju
DOI:10.1021/ol301742k
日期:2012.8.17
A high-yielding, versatile and practical Diels-Alder reaction of pentafulvenes with arynes under mild reaction conditions is reported. The aryne generated by the fluoride induced 1,2-elimination of 2-(trimethylsilyl)aryl triflates undergoes efficient cycloaddition with 6-substituted and 6,6-disubstituted pentafulvenes leading to the formation of benzonorbornadiene derivatives.