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Related reagents conjugate additions

A logical extension of the Abramov- and Pudovik-type reactions at carbonyl carbon is the conjugate addition of the phosphorus reagents at distant sites of conjugated carbonyl and related systems. A wide range of such Michael addition reactions, many of significant practical... [Pg.62]

Evans, D.A., Hurst, K.M., and Takacs, J.M., New silicon-phosphorus reagents in organic synthesis. Carbonyl and conjugate addition reactions of silicon phosphite esters and related systems, /. Am. Chem. Soc., 100, 3467, 1978. [Pg.95]

The related 6-trifluoromethyl-l,3-dioxin-4-ones underwent conjugate addition reactions with Gilman reagents, or with Grignards with copper(I) catalysis (Eq. 112). The 6-substituted compounds were also available, and were used to synthesise threonine and aZZo-threonine analogues [303]. Stark contrast between the behaviour of fluorinated and non-fluorinated compounds is revealed in Eq. (113). While benzylmagnesium chloride adds smoothly to the 6-methyl... [Pg.172]

The (diastereoselective) conjugate addition of silylcuprate reagents to a variety of chiral derivatives of a,(3-unsaturated carboxylic acids can be used to prepare optically active p-silyl esters.258 259 Best results are obtained with substrates of type (25). The (related) p-silyl ketones, which also constitute valuable building blocks for (acyclic) stereoselective synthesis, are now accessible in high ee via palladium-catalyzed enantioselective 1,4-disiiylation of a,p-unsaturated ketones (Scheme 76).260... [Pg.231]

This related conjunctive reagent has been used for methylenecyclopentane annelation of a cyclic a,/f-cnonc by conjugate addition of the nucleophilic allylsilane unit of 2 to Ihe cmmc followed by cyclization (equation ) A... [Pg.472]

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See also in sourсe #XX -- [ Pg.87 ]



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