Regioselective Pauson-Khand Processes with Olefins Possessing Extended Phosphonates
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چکیده
منابع مشابه
Catalytic Asymmetric Intramolecular Pauson Khand and Pauson Khand Type - - - Reactions
One of the limitations of the PKR is the poor regioselectivity observed in intermolecular reactions where unsymmetrical alkynes and alkenes can give rise to mixtures of four constitutional isomers. Inherent regiocontrol of the intramolecular PKR of enynes 3 to form bicyclic cyclopentenones 4 (Scheme 1) makes this variant appealing and it has been actively investigated since its inception in 198...
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Suitably functionalized fulleropyrrolidines endowed with one or two propargyl groups at the C-2 position of the pyrrolidine ring (1,6-enynes) react efficiently and regioselectively with [Co2(CO)8] to afford the respective Pauson-Khand products with an unprecedented three (5 a-d, 7, and 24) or five (25) pentagonal rings, respectively, fused onto the fullerene sphere. Fulleropyrrolidines with 1,7...
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Five membered carbocycles are important building blocks for many biologically active molecules. Moreover, substituted cyclopentenones (e.g. cyclopentenone prostaglandins) exhibit characteristic biological activity. The efficiency and atom economy of the Pauson-Khand reaction render this process potentially one of the most attractive methods for the synthesis of such compounds. Although it was d...
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Synlett 2002, No. 12, Print: 02 12 2002. Art Id.1437-2096,E;2002,0,12,2023,2026,ftx,en;G27602ST.pdf. © Georg Thieme Verlag Stuttgart · New York ISSN 0936-5214 Abstract: Microwave irradiation is used to accelerate Pauson– Khand reactions. The conditions for the Pauson–Khand reaction, catalytic in Co2(CO)8 under microwave irradiation, were optimized. It is possible to obtain various types of [2+2...
متن کاملArene-chromium tricarbonyl complexes in the Pauson-Khand reaction.
[reactions: see text] We show the use of arene-chromium tricarbonyl complexes in intra- and intermolecular Pauson-Khand reactions. Both styrene and ethynylbenzene complexes react with alkynes and olefins. The synthesis of enynes connected through chromium-complexed aromatic rings is developed. The intramolecular Pauson-Khand reaction occurs in a totally diastereoselective manner.
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ژورنال
عنوان ژورنال: Synlett
سال: 2010
ISSN: 0936-5214,1437-2096
DOI: 10.1055/s-0029-1219349