Reactions of Enynes with Alkynes

TRANSITION METAL-MEDIATED AROMATIC RING CONSTRUCTION [Pg.604]

SCHEME 21.37 Co-catalyzed Diels-Alder reaction of 2-aryl-1,3-butadiene with alkynylborane. [Pg.604]

SCHEME 2138 Pd-catalyzed homo-[4+2] cycloaddition of monosubstituted conjugated enynes. [Pg.604]

Dimerization through the [4+2] cycloaddition of electron-rich 2,4-disubstituted enynes was realized by using a palladium(II)/Ai-heterocyclic carbene/electron-rich phosphine catalyst system [Pg.605]

In this subchapter, I summarized the intermolecular two-component cycloaddition reactions, which are able to construct benzenoid aromatic rings. Four types of transition metal-catalyzed [4-r2] cycloaddition reactions (Diels-Alder reactions, reactions of enynes with alkynes, reactions via pyrylium intermediates, and reactions via acylmetallacycles) are described. [Pg.602]

Transition-metal-catalyzed [4 -I- 2] benzannulation reaction of enyne with alkyne enynophile was reported by Toste group [6]. The reaction between enynes 4 and propargyl ethers 5 in the presence of a gold catalyst led to the formation of multisubstituted arenes 6 via a formal [4-1-2] cross-benzannulation reaction (Scheme 14.3). [Pg.356]

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