N-Heterocyclic Carbene-Catalyzed (4 + 2) Cycloaddition/Decarboxylation of Silyl Dienol Ethers with α,β-Unsaturated Acid Fluorides
摘要:
Herein we report the first all-carbon N-heterocyclic carbene-catalyzed (4 + 2) cycloaddition. The reaction proceeds with alpha,beta-unsaturated acid fluorides and silyl dienol ethers and produces 1,3-cyclohexadienes with complete diastereocontrol (dr > 20:1) while demonstrating a new type of reaction cascade exploiting alpha,beta-unsaturated acyl azoliums.
Enabling the Development of N-Heterocyclic Carbene (NHC) Catalyzed Reactions: Practical Methods for the Preparation of 1-Acyl-2-Alkylcycloalkenes from Cycloalkanones
Copper-Powder-Catalyzed Synthesis of Pyrimidines from β-Bromo α,β-Unsaturated Ketones and Amidine Hydrochlorides
作者:Chan Cho、Yang Jiao、Son Ho
DOI:10.1055/s-0034-1380410
日期:2015.5
β-Bromo α,β-unsaturated ketones are coupled and cyclized with amidinehydrochlorides in the presence of a catalytic amount of copper powder along with a base to give the corresponding pyrimidines in good yields.