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Volumn 132, Issue 2, 2010, Pages 879-889

Palladium-catalyzed γ-selective and stereospecific allyl-aryl coupling between acyclic allylic esters and arylboronic acids

Author keywords

[No Author keywords available]

Indexed keywords

ARYLATIONS; ARYLBORONIC ACIDS; BENZYLIC; BIPYRIDINES; CHIRALITY TRANSFER; CINNAMYL ALCOHOLS; COUPLING PRODUCT; EFFICIENT SYNTHESIS; PALLADIUM CATALYST; PALLADIUM COMPLEXES; PHENANTHROLINES; SERTRALINE; STEREOGENIC CENTERS; STEREOSPECIFIC; STOICHIOMETRIC REACTION; SYNTHETIC UTILITY; TRANSMETALATION;

EID: 74949133334     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja9092264     Document Type: Article
Times cited : (128)

References (71)
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    • When either arylcopper reagents or cinnamyl alcohol derivatives were employed, the γ-selectivity is considerably reduced. See: refs 5c and 29. For allylic substitution reactions with stoichiometric arylcopper(I) reagents with excellent γ-selectivity, see: (a) Harrington-Frost, N.; Leuser, H.; Calaza, M. I.; Kneisel, F. F.; Knochel, P. Org. Lett. 2003, 5, 2111-2114.
    • When either arylcopper reagents or cinnamyl alcohol derivatives were employed, the γ-selectivity is considerably reduced. See: refs 5c and 29. For allylic substitution reactions with stoichiometric arylcopper(I) reagents with excellent γ-selectivity, see: (a) Harrington-Frost, N.; Leuser, H.; Calaza, M. I.; Kneisel, F. F.; Knochel, P. Org. Lett. 2003, 5, 2111-2114.
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    • Recently, Tomioka et al. reported the highly γ-selective, enantioselective substitution of cinnamyl bromides with aryl Grignard reagents. See: Selim, K. B.; Matsumoto, Y.; Yamada, K.; Tomioka, K. Angew. Chem., Int. Ed. 2009, 48, 8733-8735.
    • (c) Recently, Tomioka et al. reported the highly γ-selective, enantioselective substitution of cinnamyl bromides with aryl Grignard reagents. See: Selim, K. B.; Matsumoto, Y.; Yamada, K.; Tomioka, K. Angew. Chem., Int. Ed. 2009, 48, 8733-8735.
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    • The stereospeci-ficity of the Rh catalysis has been explained based on the [σ+π] nature of the allyl (enyl) ligand
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    • Pd-catalyzed γ-selective allyl-aryl coupling between aryl iodides and allylic acetates has been reported. However, the reaction required harsh conditions (typically 180 °C) and was not stereoselective. See: (a) Mariamphillai, B.; Herse, C.; Lautens, M. Org. Lett. 2005, 7, 4745-4747.
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    • 1H NMR and GC analysis of the crude product, using the corresponding α-isomer (3f) as a reference compound.
    • 1H NMR and GC analysis of the crude product, using the corresponding α-isomer (3f) as a reference compound.
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    • Reducing the amount of phenylboronic acid (2a) decreased the yield of the coupling product 3a under otherwise identical conditions.
    • Reducing the amount of phenylboronic acid (2a) decreased the yield of the coupling product 3a under otherwise identical conditions.
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    • For Schemes 2 and 3 and Tables 2 and 3, the crude materials after removal of the catalyst and boron compounds consisted of the coupling product, biaryl, unreacted allylic acetate, and/or unidentified compounds. The Mizoroki-Heck-type product was not detected. The isolated products were contaminated with traces of unidentified materials (0.1-5%). The isolated yields for the reaction of 1g,h,i,l in Tables 2 and 3 may be reduced by the evaporation of the products.
    • For Schemes 2 and 3 and Tables 2 and 3, the crude materials after removal of the catalyst and boron compounds consisted of the coupling product, biaryl, unreacted allylic acetate, and/or unidentified compounds. The Mizoroki-Heck-type product was not detected. The isolated products were contaminated with traces of unidentified materials (0.1-5%). The isolated yields for the reaction of 1g,h,i,l in Tables 2 and 3 may be reduced by the evaporation of the products.
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    • The reaction of terminal alkenes 1d and 1i were carried out with THF solvent Table 2, The use of THF suppressed the formation of unidentified side products
    • The reaction of terminal alkenes 1d and 1i were carried out with THF solvent (Table 2, entries 9 and 14). The use of THF suppressed the formation of unidentified side products.
    • entries 9 and 14)
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    • 6,10 mol %; THF; 60 °C] afforded the corresponding coupling product in only 17% yield.
    • 6,10 mol %; THF; 60 °C] afforded the corresponding coupling product in only 17% yield.
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    • See ref 6c and references therein
    • See ref 6c and references therein.
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    • For syntheses of, )-sertraline, see: a
    • For syntheses of (+)-sertraline, see: (a) Quallich, G. J. Chirality 2005, 17, S120-S126.
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    • 13C NMR measurement was unsuccessful.
    • 13C NMR measurement was unsuccessful.
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    • This is contradictory with the reported results of the oxidative Mizoroki-Heck-type arylation of allylic esters with arylboronic acids. See ref 17
    • This is contradictory with the reported results of the oxidative Mizoroki-Heck-type arylation of allylic esters with arylboronic acids. See ref 17.


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