Literature DB >> 18844363

Continuum of mechanisms for nucleophilic substitutions of cyclic acetals.

Jennifer R Krumper1, Walter A Salamant, K A Woerpel.   

Abstract

The effect of nucleophile strength on diastereoselectivity in the nucleophilic substitution of cyclic acetals was explored. Stereoselectivity remained constant and high as nucleophilicity increased until a threshold value was reached. Beyond this point, however, selection of Lewis acid determined whether stereochemical inversion or erosion was observed.

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Year:  2008        PMID: 18844363      PMCID: PMC2664297          DOI: 10.1021/ol8019956

Source DB:  PubMed          Journal:  Org Lett        ISSN: 1523-7052            Impact factor:   6.005


  15 in total

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9.  Mechanism of 4,6-O-benzylidene-directed beta-mannosylation as determined by alpha-deuterium kinetic isotope effects.

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2.  Macrocyclic bis-thioureas catalyze stereospecific glycosylation reactions.

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8.  Correlations between nucleophilicities and selectivities in the substitutions of tetrahydropyran acetals.

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Review 10.  Reactions of Allylmagnesium Reagents with Carbonyl Compounds and Compounds with C═N Double Bonds: Their Diastereoselectivities Generally Cannot Be Analyzed Using the Felkin-Anh and Chelation-Control Models.

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