Extending the Scope of Chromium−Manganese Redox-Coupled Reactions: A One-Pot Synthesis of Benzoxazoles
摘要:
A critically important strategy for synthetic chemistry is the development of "domino" processes: those capable of concatenating multiple transformations into a single step. Such transformations not only provide an increase in synthetic efficiency, but also imply the development of a significant degree of mechanistic understanding. We report herein a new domino reaction, in which a chromium-manganese redox couple is employed both to catalytically reduce an o-hydroxy nitroarene and to oxidatively cyclize a subsequently formed imine. We find that the reaction is most effective for starting o-hydroxy nitroarenes with a strongly electron-withdrawing group at the para position.
Alkoxycarbonylamino benzoic acid or alkoxycarbonylamino tetrazolyl phenyl derivatives as IP antagonists
申请人:——
公开号:US20020165235A1
公开(公告)日:2002-11-07
This invention relates to compounds which are generally IP receptor antagonists and which are represented by Formula I:
1
wherein G
1
is selected from the group consisting of a, b
1
, and b
2
2
and A and G
2
are as defined in the specification; or individual isomers, racemic or non-racemic mixtures of isomers, or pharmaceutically acceptable salts or solvates thereof. The invention further relates to pharmaceutical compositions containing such compounds, methods for their use as therapeutic agents, and methods of preparation thereof.
MUSCARINIC RECEPTOR AGONISTS, COMPOSITIONS, METHODS OF TREATMENT THEREOF, AND PROCESSES FOR PREPARATION THEREOF-176
申请人:Jin Shujuan
公开号:US20090221642A1
公开(公告)日:2009-09-03
Compounds of Formula 1, or pharmaceutically acceptable salts thereof:
wherein X, R
1
, R
2
, R
3
, R
4
, R
5
, n, m, and p are as defined in the specification as well as salts and pharmaceutical compositions including the compounds are prepared. They are useful in therapy, in particular in the management of pain.
The present invention relates to curatives for epoxy resins, and compositions (e.g. adhesives) containing such resins cured using the same methods of preparation and uses therefor. More specifically, the present invention relates to hybrid curatives for epoxy resins comprising both aromatic amine, phenol and/or phenyl ester moieties. A further aspect of the current invention relates to new imidazole catalysts that possess a combination of excellent cure latency as well as low cure temperature onset.
Design and synthesis of purine nucleoside analogues for the formation of stable anti-parallel-type triplex DNA with duplex DNA bearing the <sup>5m</sup>CG base pair
herein demonstrated for the first time the direct recognition of duplex DNA bearing the 5-methyl-2′-deoxycytosine and 2′-deoxyguanosine base pair by triplex DNA formation. Triplex-forming oligonucleotides contained the novel artificial nucleoside analogues 2-amino-2′-deoxy-nebularine derivatives, and their molecular design, synthesis, and functional evaluation are described.
我们在此首次证明了通过三链 DNA 形成直接识别带有 5-甲基-2'-脱氧胞嘧啶和 2'-脱氧鸟苷碱基对的双链 DNA。三链体形成的寡核苷酸包含新型人工核苷类似物 2-氨基-2'-脱氧-nebularine 衍生物,并描述了它们的分子设计、合成和功能评估。
Multicomponent Reactions of Convertible Isonitriles
作者:Michael C. Pirrung、Subir Ghorai、Tannya R. Ibarra-Rivera
DOI:10.1021/jo900414n
日期:2009.6.5
they are convertible). Moreover, they do not have the objectionable odors for which isonitriles are typically known, making them more accessible as reagents for organic synthesis. One focus of the work is isonitriles bearing perfluorinated alkyl groups that enable the ready separation of such reagents from nonfluorinated reaction products using the “light” fluorous method of fluorous solid-phase extraction