achieved with a two-step protocol comprising an allylic cation mediated nucleophilic addition and an intramolecular cyclization reaction. The N-aryl sulfonyl protecting groups of cyclization products were readily removed to furnish free amines with retention of halogensubstitutions and CC double bonds.
METHOD FOR SYNTHESIZING AN N-UNSUBSTITUTED OR N-SUBSTITUTED AZIRIDINE
申请人:Melder Johann-Peter
公开号:US20100191000A1
公开(公告)日:2010-07-29
Process for preparing an N-unsubstituted or N-substituted aziridine of the formula
which comprises reacting an olefin of the formula I
where R
1
to R
5
are each, independently of one another, hydrogen, a linear or branched alkyl radical having from 1 to 16 carbon atoms, a hydroxyalkyl radical having from 1 to 4 carbon atoms, a cycloalkyl radical having from 5 to 7 carbon atoms, a benzyl or phenyl radical which in each case may be substituted in the o, m or p position of the phenyl radical by methoxy, hydroxy, chlorine or alkyl radicals having from 1 to 4 carbon atoms and the radical R
1
or R
2
together with the radical R
3
or R
4
may be closed to form a 5- to 12-membered ring or the radicals R
1
and R
2
may be closed to form a 5- to 12-membered ring, with ammonia or a primary amine of the formula R
5
NH
2
in the presence of iodine or bromine.
Synthesis of AntiproliferativeCephalotaxus Esters and Their Evaluation against Several Human Hematopoietic and Solid Tumor Cell Lines: Uncovering Differential Susceptibilities to Multidrug Resistance
作者:Joseph D. Eckelbarger、Jeremy T. Wilmot、Matthew T. Epperson、Chandar S. Thakur、David Shum、Christophe Antczak、Leonid Tarassishin、Hakim Djaballah、David Y. Gin
DOI:10.1002/chem.200701998
日期:2008.5.9
isolated from the Cephalotaxus genus. Convergent syntheses of these four natural products are described, each involving novel synthetic methods and strategies. These syntheses enabled evaluation of several advanced natural and non-natural compounds against an array of human hematopoietic and solidtumor cells. Potent cytotoxicity was observed in several cell lines previously not challenged with these
Structure and Reactivity of a Manganese(VI) Nitrido Complex Bearing a Tetraamido Macrocyclic Ligand
作者:Huatian Shi、Hung Kay Lee、Yi Pan、Kai-Chung Lau、Shek-Man Yiu、William W. Y. Lam、Wai-Lun Man、Tai-Chu Lau
DOI:10.1021/jacs.1c08072
日期:2021.9.29
Manganese complexes in +6 oxidation state are rare. Although a number of Mn(VI) nitrido complexes have been generated in solution via one-electron oxidation of the corresponding Mn(V) nitrido species, they are too unstable to isolate. Herein we report the isolation and the X-ray structure of a Mn(VI) nitrido complex, [MnVI(N)(TAML)]– (2), which was obtained by one-electron oxidation of [MnV(N)(TAML)]2–
CEPHALOTAXUS ESTERS, METHODS OF SYNTHESIS, AND USES THEREOF
申请人:Gin David
公开号:US20110071097A1
公开(公告)日:2011-03-24
The present invention provides novel cephalotaxus esters, syntheses thereof, and intermediates thereto. The invention also provides pharmaceutical compositions comprising a compound of the present invention and methods of using said compounds or compositions in the treatment of proliferative diseases (e.g., benign neoplasm, cancer, inflammatory disease, autoimmune disease, diabetic retinopathy) and infectious disease. The invention further provides methods of using said compounds or compositions in the treatment of multidrug resistant cancer.