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Categories: C-C Bond Formation > Oxygen-containing molecules > Carboxylic Acids and Derivatives > Alkylations

Propargylations

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The room-temperature nucleophilic addition of vinyl azides to propargylic alcohols in the presence of a catalytic amount of BF3·Et2O provides 4-ynamides. The procedure is operationally convenient, shows broad substrate scope, and tolerates many functional groups. Further, a Vilsmeier intramolecular cyclization of 4-ynamides gives dihydrofuran-2(3H)-ones with the alkyne group as the nucleophile.
J. Zheng, J.-H. Lin, L.-Y. Yu, Y. Wei, X. Zheng, J.-C. Xiao, Org. Lett., 2015, 17, 6126-6129.


A one-step, three-component condensation of allenyl boronic acids or allenyl pinacolboronates with amines and aldehydes affords α-allenyl or α-propargyl α-amino acids and anti-β-amino alcohols. Secondary amines generate exclusively α-allenyl α-amino acids, while primary aliphatic amines lead to α-propargyl α-amino acids.
F. Liepouri, G. Bernasconi, N. A. Petasis, Org. Lett., 2015, 17, 1628-1631.