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).
Alkynylation of aldehydes mediated by zinc and allyl bromide: a practical synthesis of propargylic alcohols
Abstract A practical synthesis of propargylic alcohols was developed by alkynylation of aldehydes mediated by zinc and allylbromide. Aromatic, aliphatic and vinyl aldehydes react with phenylacetylene or 1-hexyne to obtain various propargylic alcohols at room temperature in up to 98% yield. This method is characterized with inexpensive materials, wide substrate scope, and mild reaction conditions,
Bifunctionalized Allenes, Part IX: An Efficient Method for Regioselective Synthesis of 4-Heteroatom-Functionalized Allenecarboxylates
作者:Ivaylo K. Ivanov、Ivaylo D. Parushev、Valerij Ch. Christov
DOI:10.1002/hc.21096
日期:2013.7
An efficient method for regioselective synthesis of 4-heteroatom-functionalized allenecarboxylates by an atom economical [2,3]-sigmatropic rearrangement of the mediated 2-heteroatom-functionalized alk-3-ynecarboxylates is described. Alkyl 4-(dimethoxyphosphoryl), (diphenylphosphinoyl), (benzenesulfinyl), or (methanesulfonyl)-alka-2,3-dienoates can be readily prepared via reactions of alkyl 2-hydroxy-alk-3-ynoates