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Volumn 133, Issue 22, 2011, Pages 8502-8505

A new strategy for the synthesis of chiral β-alkynyl esters via sequential palladium and copper catalysis

Author keywords

[No Author keywords available]

Indexed keywords

ALKYNYLS; ALLYLIC CARBONATES; CHIRAL BUILDING BLOCKS; COPPER CATALYSIS; CU CATALYSIS; HETEROCYCLES; NEW STRATEGY; REACTION SEQUENCES; SILYL GROUP; TERMINAL ALKYNE;

EID: 79957992135     PISSN: 00027863     EISSN: 15205126     Source Type: Journal    
DOI: 10.1021/ja203171x     Document Type: Article
Times cited : (47)

References (54)
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    • For selected Cu-catalyzed asymmetric 1,4-reductions, see:;; Org. Lett. 2009, 5374
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    • In addition to the formation of 4bb in 59% isolated yield, reduction of ynenoate 3bb produced complex, inseparable mixtures of byproducts consistent with 1,6-reduction that represent the remaining mass balance.
    • In addition to the formation of 4bb in 59% isolated yield, reduction of ynenoate 3bb produced complex, inseparable mixtures of byproducts consistent with 1,6-reduction that represent the remaining mass balance.
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    • Alkyne (S)- 4bb was readily reduced to ester (R)- SI-3, the antipode of which has previously been prepared in 87% ee
    • Alkyne (S)- 4bb was readily reduced to ester (R)- SI-3, the antipode of which has previously been prepared in 87% ee: Lopez, F.; Harutyunyan, S. R.; Meetsma, A.; Minnaard, A. J.; Feringa, B. L. Angew. Chem., Int. Ed. 2005, 44, 2752
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    • The absolute stereochemistry of the current CuH reduction is assigned by analogy. We also note that the synthesis of (R)- SI-3, constitutes the formal addition an alkyl group to an α,β-unsaturated ester. We believe that this 3-step sequence, comprised entirely of catalytic reactions, compares favorably to other known, asymmetric, alkyl conjugate addition reactions.
    • The absolute stereochemistry of the current CuH reduction is assigned by analogy. We also note that the synthesis of (R)- SI-3, constitutes the formal addition an alkyl group to an α,β-unsaturated ester. We believe that this 3-step sequence, comprised entirely of catalytic reactions, compares favorably to other known, asymmetric, alkyl conjugate addition reactions.
  • 50
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    • While the hydroalkynylations were routinely performed on a 1.0 mmol scale, the CuH reductions were typically performed on a 0.15-0.30 mmol scale. As a preliminary indication of scalability, the synthesis of alkyne 4ca was performed on a 0.75 mmol scale, and the reaction maintained excellent yield and enantioselectivity (98% yield, 99% ee).
    • While the hydroalkynylations were routinely performed on a 1.0 mmol scale, the CuH reductions were typically performed on a 0.15-0.30 mmol scale. As a preliminary indication of scalability, the synthesis of alkyne 4ca was performed on a 0.75 mmol scale, and the reaction maintained excellent yield and enantioselectivity (98% yield, 99% ee).
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    • Lactone 5 was synthesized using Otera's catalyst (1,3- diisothiocyanatotetrabutyldistannoxane)
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    • For a related gold-catalyzed synthesis of tetrahydrofurans, see
    • For a related gold-catalyzed synthesis of tetrahydrofurans, see: Belting, V.; Krause, N. Org. Lett. 2006, 8, 4489
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    • Belting, V.1    Krause, N.2


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.