Lewis base-catalyzed cyanation of Morita-Baylis-Hillman carbonates. Synthesis of allylamine derivatives
作者:Hai Ma、Feng Sui、Qing-He Zhao、Ning Zhang、Yi Sun、Jing Xian、Meng-Jiao Jiao、Yu-ling Liu、Zhi-Min Wang
DOI:10.1016/j.tetlet.2017.07.038
日期:2017.8
DABCO-catalyzed cyanation of MBH carbonates via 1,3-proton shift transfer is reported. The adducts of cyanation are converted in one step to allylic amines derivatives. The salient features of this reaction include readily available starting materials, mild conditions, broad substrate scope, high efficiency and valuable further applications. The process of the 1,3-proton shift transfer was conducted
Enanatiopure β‐methyl‐γ‐monofluoromethyl alcohols were prepared from the allylic alkylation between fluorobis(phenylsulfonyl)methane with Morita–Baylis–Hillmancarbonates. The reaction was catalyzed by using the Cinchonaalkaloid derivative, (DHQD)2AQN. The origin of the stereoselectivity was verified by DFT methods. Calculated geometries and relative energies of various transition states strongly
The highly enantioselective asymmetric allylic alkylation of Morita–Baylis–Hillmancarbonates with bis(phenylsulfonyl)methane is presented. The reaction is simply catalyzed by cinchonaalkaloid derivatives affording the final alkylated products in good yields and enantioselectivities.
Acylation of Baylis-Hillman carbonates by visible light catalysis has been reported. Acyl radical is produced by decarboxylation of α-keto acid. This method has mild conditions, wide substrate scope, good functional group tolerance, and moderate to good yield, which provides a new route for the acylation of Baylis-Hillman derivatives.
Asymmetric allylic amination of Morita–Baylis–Hillman (MBH) adducts with simple aromatic amines is successfully realized by nucleophilic amine catalysis. A range of substituted α-methylene-β-arylamino esters is accessed in moderate to high yields (up to 88%) and with excellent enantioselectivities (up to 97% ee). Inorganic fluorides are found to be able to improve the enantioselectivity of the allylic