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Intramolecular synthesis

Keywords enantiospecific synthesis, intramolecular Diels-Alder approaches... [Pg.315]

Other Methods of Synthesis Intramolecular cyclic hydroxyamino-alkynes (188) and (189), depending on the relative position between the hydroxy-lamino group and acetylenic fragment, leads to five-(190), six-(191), and seven-(192) membered cyclic nitrones (Scheme 2.67) (348-350). [Pg.180]

There is some increase in selectivity with functionally substituted carbenes, but the selectivity is still not high enough to prevent formation of mixtures. Phenylchlorocarbene gives a relative reactivity ratio of 2.1 1 0.09 in insertion reactions with isopropylbenzene, ethylbenzene, and toluene.132 For cycloalkanes, tertiary positions are about 15 times more reactive than secondary positions toward phenylchlorocarbene.133 Carbethoxycarbene inserts at tertiary C—H bonds about three times as fast as at primary C—H bonds in simple alkanes.134 Because of low selectivity, intermolecular insertion reactions are seldom useful in synthesis. Intramolecular insertion reaction are of considerably more use. Intramolecular insertion reactions usually occur at the C—H bond that is closest to the carbene, and good yields can frequently be obtained. Intramolecular insertion reactions can provide routes to highly strained structures that would be difficult to obtain in other ways. [Pg.635]

A previous review has highlighted the following methods of ring synthesis intramolecular cyclization of oximes, nitro alkenes, and nitrones, and [4+2] cycloaddition reactions <1996CHEC-II(6)279>. In addition to that, this review includes the intramolecular cyclization of hydroxylamines, hydroxamates, hetero-Diels-Alder [4+2], 1,3-dipolar cycloaddition of nitrile oxides to alkenes, and [3+3] cycloaddition reactions. This review does not cover cycloaddition reactions of the [4+2] [3+2] and [4+2] [3+2] [3+2] types which primarily led to heterocycle-fused oxazine ring systems. [Pg.353]

The intermediate resulting from addition of H is similar to the intermediate in a Williamson ether synthesis. Intramolecular reaction occurs to form the epoxide. [Pg.464]

Indole synthesis. Intramolecular sp -sp coupling mediated by Mg is applied to synthesis of 2-fluoroalkylindoles. [Pg.283]

Mixed coupling reactions, using two different carbonyl compounds, can be effected, but they generally lead to mixtures of products and are of limited use in synthesis. Intramolecular reactions with dicarbonyl compounds, on the other hand, provide a good route to cyclic alkenes. The keto-aldehyde 80, for example, gave the cyclic diterpene kempene-2, despite the presence of a saturated ketone... [Pg.148]

CHEMISTRY OF ERYTHROMYCIN Structure and physical-chemical data Total synthesis Intramolecular cyclization... [Pg.57]

Wieland s. Barbier Wilkinson rhodium catalyst s. Chlorotris(triphenyl-phosphine)rhodium Wittig synthesis, intramolecular to... [Pg.251]

Decarbonylation (s.a. Cross-coupling, decarbonylative Diene synthesis, intramolecular, -)... [Pg.222]

Ene reaction, intramolecular (s.a. Ene synthesis, intramolecular Metallo-ene reaction, Palladium-ene reaction, -)... [Pg.227]

Wittig synthesis-diene synthesis, intramolecular 43, 831 Wittig-type synthesis... [Pg.261]


See other pages where Intramolecular synthesis is mentioned: [Pg.987]    [Pg.271]    [Pg.1387]    [Pg.237]    [Pg.239]    [Pg.214]    [Pg.215]    [Pg.224]    [Pg.227]    [Pg.230]    [Pg.231]    [Pg.238]    [Pg.252]    [Pg.253]    [Pg.321]    [Pg.650]   
See also in sourсe #XX -- [ Pg.215 , Pg.221 , Pg.225 , Pg.227 , Pg.229 , Pg.232 ]

See also in sourсe #XX -- [ Pg.215 , Pg.221 , Pg.225 , Pg.227 , Pg.229 , Pg.232 ]




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Acorenone synthesis via intramolecular ene reaction

Aglycone delivery, intramolecular oligosaccharide synthesis

Alkaloid syntheses heterocyclic synthesis, intramolecular

Alkene derivatives heterocyclic synthesis, intramolecular

Alkyl derivatives heterocyclic synthesis, intramolecular

Amides heterocyclic synthesis, intramolecular

Aniline derivatives heterocyclic synthesis, intramolecular

Aryl derivatives heterocyclic synthesis, intramolecular

Baker-Venkataraman synthesis intramolecular acyl transfer

Benzyl derivatives heterocyclic synthesis, intramolecular

Better and Alexander Zapf 2 Intramolecular Heck Reaction 1 Synthesis of Carbocycles

Calciferol, 1,25-dihydroxyAring synthesis via intramolecular ene reaction

Carbazoles intramolecular synthesis

Carbonyl compounds heterocyclic synthesis, intramolecular

Diels-Alder type syntheses intramolecular

Elimination reactions heterocyclic synthesis, intramolecular Heck

Ethers heterocyclic synthesis, intramolecular

Heterocyclic synthesis, intramolecular carbopalladation

Houben-Hoesch synthesis intramolecular

Indole compounds heterocyclic synthesis, intramolecular

Indole synthesis intramolecular

Intramolecular Boger pyridine synthesis

Intramolecular Diels-Alder synthesis

Intramolecular Keto Ester Cyclizations Synthesis of Cyclanones

Intramolecular Michael addition synthesis

Intramolecular aldol cyclization in -upial synthesis

Intramolecular aldol cyclization in poitediol synthesis

Intramolecular amination Buchwald-Hartwig indole synthesis

Intramolecular amination Hegedus indole synthesis

Intramolecular amination aniline synthesis

Intramolecular amination copper-catalyzed indole synthesis

Intramolecular coupling synthesis

Intramolecular cyclization synthesis

Intramolecular cycloaddition in -sinularene synthesis

Intramolecular cycloaddition synthesis

Intramolecular cycloadditions enantioselective synthesis

Intramolecular cycloadditions synthesis applications

Intramolecular cycloalkylation in -amjitrienol synthesis

Intramolecular cycloalkylation synthesis

Intramolecular dihydropyrrole synthesi

Intramolecular enantioselective synthesis

Intramolecular nitrile oxide cycloaddition synthesis

Intramolecular photocycloaddition in isoamijiol synthesis

Intramolecular photocycloaddition synthesis

Intramolecular reactions Buchwald-Hartwig indole synthesis

Intramolecular reactions Larock indole synthesis

Intramolecular reductive coupling in isoamijiol synthesis

Intramolecular reductive coupling synthesis

Lactam synthesis carbonylation, intramolecular cyclization

Lactone synthesis intramolecular cyclization

Malonic acid synthesis intramolecular

Malonic ester synthesis intramolecular

Mniopetal E synthesis via intramolecular Diels-Alder

Natural products synthesis intramolecular reactions

Olefin structures heterocyclic synthesis, intramolecular

Organic synthesis intramolecular attack

P-Acorenol synthesis via intramolecular ene reaction

SPM Synthesis through Intramolecular Reactions

Senoxydene synthesis via intramolecular ene reactions

Side reactions heterocyclic synthesis, intramolecular

Spiroacetal synthesis, intramolecular

Synthesis intramolecular Friedel-Crafts reaction

Synthesis intramolecular dehydrative acylations

Synthesis intramolecular strategy

Synthesis of Indoles via Intramolecular Arylation Reactions

Tandem intermolecular-intramolecular synthesis

Tandem intermolecular-intramolecular synthesis cycloadditions

The Asymmetric Intramolecular Mizoroki-Heck Reaction in Natural Product Total Synthesis

Thromboxane synthesis via intramolecular photocycloaddition

Total Synthesis Involving Intramolecular FC Alkylations

Williamson ether synthesis intramolecular

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