Acid-mediated synthesis of fully substituted 1,2,3-triazoles: multicomponent coupling reactions, mechanistic study, synthesis of serine hydrolase inhibitor and its derivatives
We describe the full details of multicomponent coupling reactions in acid-mediated synthesis of fully substituted 1,2,3-triazoles syntheses, and their applications to bioactive molecule synthesis. For substitution with wide range of nucleophiles, selection of acids or activating reagents was important, and various types of multicomponent coupling reactions were demonstrated, allowing functionalization with alcohols, amines, thiol, azide, and carbon nucleophiles. Four-component couplings including double triazolations were also tested. The efficiency of this method was demonstrated by the synthesis of serine hydrolase inhibitor and its novel substituted derivatives. (C) 2014 Elsevier Ltd. All rights reserved.
Microwave-Assisted Domino Access to C<sub>2</sub>-Chain Functionalized Furans from Tertiary Propargyl Vinyl Ethers
Tertiary propargyl vinyl ethers armed with an electron-withdrawing group (amide or ester) at the tertiary propargylic position have been efficiently transformed Into trisubstituted C-2-chain functionalized furans. The metal-free domino transformation Involves a microwave-assisted tandem [3,3]propargyl Claisen rearrangement/5-exo-dig O-cyclization reaction. The manifold can be performed In a one-pot fashion from the primary components (1,2-ketoester/1,2-ketoamide or tertiary propargyl alcohols).