作者:Roland U. Braun、Markus Ansorge、Thomas J. J. Müller
DOI:10.1002/chem.200600530
日期:2006.12.4
coupling of electron-deficient (hetero)aryl halides 1 and (hetero)aryl or alkenyl 1-propargyl alcohols 2 does not terminate at the stage of the expected internal propargyl alcohols, but rather gives rise to the formation of alpha,beta-unsaturated ketones 3 with a variety of acceptor substituents. This new domino reaction, a coupling-isomerization reaction (CIR), can be rationalized as a sequence of
4-and 5-alkynyloxindoles and 4-and 5-alkenyloxindoles
申请人:Hoffmann-La Roche Inc.
公开号:US06313310B1
公开(公告)日:2001-11-06
Disclosed are 4- and 5-alkynyloxindoles as well as 4- and 5-alkenyloxindoles that inhibit or modulate protein kinases, in particular JNK protein kinases. The compounds of the invention and their pharmaceutically acceptable salts, and prodrugs of said compounds, are useful as anti-inflammatory agents, particularly useful in the treatment of rheumatoid arthritis. Also disclosed are pharmaceutical compositions containing the foregoing compounds, methods for the treatment and/or control of inflammation, particularly in the treatment or control of rheumatoid arthritis using these compounds, as well as intermediates useful in the preparation of compounds of the invention.
Regioselectivity Switch in Palladium‐Catalyzed Allenylic Cycloadditions of Allenic Esters: [4+1] or [4+3] Cycloaddition/Cross‐Coupling
作者:Long Li、Pengfei Luo、Yuhua Deng、Zhihui Shao
DOI:10.1002/anie.201901511
日期:2019.3.26
The first Pd‐catalyzed asymmetric allenylic [4+1] cycloaddition was successfully developed. Alternatively, tuning the Pd catalyst switched the reactivity toward an unprecedented [4+3] cycloaddition/cross‐coupling. Ligands play a vital role in controlling the reaction pathway, allowing highly selective access to different products from identical substrates. Biological evaluation of the obtained compounds
H-phosphine oxides for the construction of α-aminophosphine oxides has been developed. The CN and C P bond could be efficiently formed in one pot operation via sequentialCC and C O bond cleavage of propargylic alcohols. This present methodology, which not only provides a simple and alternative strategy for the synthesis of α-aminophosphine oxides, but also opens a new window for the cleavage reactions of
Gold(I)-Catalyzed Isomerization of Allenyl Carbinol Esters: An Efficient Access to Functionalized 1,3-Butadien-2-ol Esters
作者:Andrea K. Buzas、Florin M. Istrate、Fabien Gagosz
DOI:10.1021/ol063031t
日期:2007.3.1
A study concerning the gold(I)-catalyzed rearrangement of diversely substituted allenyl carbinol esters into functionalized 1,3-butadien-2-ol esters is described. The mild conditions employed allow the efficient, rapid, and stereoselective synthesis of a variety of such compounds via a new 1,3-shift of an ester moiety onto a gold-activated allene. [structure: see text]