4.8 Article

Phosphine-Catalyzed [3+2] Cycloaddition of 4,4-Dicyano-2-methylenebut-3-enoates with Benzyl Buta-2,3-dienoate and Penta-3,4-dien-2-one

Journal

ACS CATALYSIS
Volume 3, Issue 4, Pages 507-512

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/cs300751a

Keywords

allenoate; 4,4-dicyano-2-methylenebut-3-enoates; multifunctional chiral phosphines; [3+2] cycloaddition

Funding

  1. Shanghai Municipal Committee of Science and Technology [11JC1402600]
  2. National Basic Research Program of China [(973)-2010CB833302]
  3. Fundamental Research Funds for the Central Universities
  4. National Natural Science Foundation of China [21102166, 21072206, 20472096, 20872162, 20672127, 21121062, 20732008]

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4,4-Dicyano-2-methylenebut-3-enoates are employed in the phosphine-catalyzed [3 + 2] cycloaddition with allenoates for the first time, affording regiospecific [3 + 2]-annulation products in moderate to good yields. The multifunctional chiral thiourea-phosphines having an axially chiral binaphthyl scaffold are effective catalysts for the asymmetric variant of this reaction, giving the alpha-regioisomers in good yields and moderate enantioselectivities.

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