stereocenters bearing both a trifluoromethylthio (SCF3) group and a cyano group has been realized, through asymmetric organophosphine-catalyzed Mannich-typereactions. The products were obtained in high yields and moderate to high enantioselectivities. Two diastereoisomers could be isolated from each reaction (overall 25 examples), rendering this approach a viable opportunity for molecular diversity generation
A reaction sequence leading to the new title compounds is described, the key step of which is an intramolecular cycloaddition of nitrilimine to a nitrile group.
描述了一种生成新标题化合物的反应序列,其中的关键步骤是腈亚胺与氰基的分子内环加成反应。
Etude de la regioselectivite en fluoration anodique de derives benzyliques
作者:Eliane Laurent、Bernard Marquet、Robert Tardivel
DOI:10.1016/s0040-4020(01)86437-1
日期:1991.1
By anodic oxidation of paramethylbenzylsulfonate, ester and nitrite in Et3N,3HF/CH3CN, regioselective functionalization at benzylic positions is obtained (benzylic fluorides and acetamides are formed). In order to examin the determining factors of the chemioselectivity. It was compared to those obtained in bromination of the same compounds by 1,3-dibromo 5,5-dimethylhydantoïn (DBH)/2.2′-azobis(isobutyronitrile)
Substituierte Azole, Verfahren zur Herstellung und ihre Verwendung
申请人:HOECHST AKTIENGESELLSCHAFT
公开号:EP0468372A2
公开(公告)日:1992-01-29
Die Erfindung betrifft Verbindungen der Formel (I),
in welcher
X, Y und Z gleich oder verschieden sind und N oder CR2 bedeuten und die übrigen Reste die in der Beschreibung definierte Bedeutung haben, Verfahren zu deren Herstellung, diese enthaltende Mittel und deren Verwendung.
本发明涉及式(I)化合物、
其中
X、Y 和 Z 相同或不同,并表示 N 或 CR2,其他基团的含义在描述、制备工艺、含有这些基团的制剂及其用途中定义。
Metal-free C(sp3)-H Bromination: Synthesis of Phenacyl bromide and Benzyl bromide derivatives
作者:Sourav Mal、Satinath Sarkar、Manoranjan Jana
DOI:10.1007/s12039-022-02107-4
日期:——
PhI(OAc)2 (iodobenzene diacetate) in presence of KBr, while the bromination in aromatic ketones requires additional assistance of p-TsOH.H2O and BF3.Et2O. Graphical abstract Synopsis: Synthesis of phenacylbromides has been achieved under transition metal-free conditions. Some observations on substituted toluene systems have also been reported. In both cases, C(sp3)-H bromination has taken place at room