Comprehensive Organic Synthesis II 2014
DOI: 10.1016/b978-0-08-097742-3.00535-8
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5.34 Early Transition Metal Mediated Reductive Coupling Reactions

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Cited by 12 publications
(11 citation statements)
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“…These species can be considered as 1,2-dianion equivalents and can be intercepted sequentially by two different electrophiles. Often, the resulting metallacycles can be further functionalized, forming the basis for a diverse set of coupling reactions, such as the Negishi 21,22,45 , Fagan-Nugent 19,8385 , Kulinkovich 43,8688 , Pauson-Khand 8994 and several other stoichiometric coupling reactions of alkynes, alkenes, alkyl halides and carbonyl compounds 18,20 . Although most d 2 early metals exhibit this type of reactivity, low-valent Ti and Zr complexes — in particular, Cp 2 M n (M = Ti, Zr) and (O’’Pr) 2 T II fragments — have seen the most development in this field, and as such the use of such reagents in the total synthesis of natural products has flourished 23,9597 .…”
Section: Reductive Coupling Reactionsmentioning
confidence: 99%
“…These species can be considered as 1,2-dianion equivalents and can be intercepted sequentially by two different electrophiles. Often, the resulting metallacycles can be further functionalized, forming the basis for a diverse set of coupling reactions, such as the Negishi 21,22,45 , Fagan-Nugent 19,8385 , Kulinkovich 43,8688 , Pauson-Khand 8994 and several other stoichiometric coupling reactions of alkynes, alkenes, alkyl halides and carbonyl compounds 18,20 . Although most d 2 early metals exhibit this type of reactivity, low-valent Ti and Zr complexes — in particular, Cp 2 M n (M = Ti, Zr) and (O’’Pr) 2 T II fragments — have seen the most development in this field, and as such the use of such reagents in the total synthesis of natural products has flourished 23,9597 .…”
Section: Reductive Coupling Reactionsmentioning
confidence: 99%
“…The challenge of accomplishing alkene–alkyne cross-coupling (intermolecular) is related to the low reactivity of substituted alkenes in the intermolecular carbometalation step and the established instability of the metallacyclopentene intermediates that result from cross-coupling. 34, 35 As illustrated in Figure 9B, a central feature of Negishi’s alkyne–alkyne coupling process took advantage of this instability. Treatment of an alkyne with the organometallic species generated from addition of 2 equiv.…”
Section: Introductionmentioning
confidence: 99%
“…Here, metal-centered [2+2+1] chemistry first delivers an unsaturated metallacyclopentane that can participate in subsequent ring-forming processes. [3] Examples of such include the Reppe reaction, [4] where alkyne trimerization results in the formation of benzenes, and the Pauson–Khand reaction, [5] where cyclopentenones are generated from the union of an alkyne with an alkene and CO (Figure 1B). Despite the now commonly accepted power of these metallacycle-mediated annulative coupling reactions in organic synthesis, they both remain quite limited in scope.…”
Section: Introductionmentioning
confidence: 99%