Ruthenium(II)-Catalyzed Intermolecular Cyclo(co)trimerization of 3-Halopropiolamides with Internal Alkynes

19 April 2018, Version 1
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

A highly chemo- and regioselective cyclo(co)trimerization between 3-halopropiolamides and symmetrical internal alkynes is reported. The reaction is catalyzed by Ru(II)-complexes and proceeds at ambient temperature in ethanol to deliver fully substituted dihalogenated isophthalamides. 1,4-Butynediol was found to undergo spontaneous lactonization with halopropiolamides after trimerization to provide 5,7-dihalo-phthalide products.

Keywords

ruthenium
cyclotrimerization
organometallic catalysis
phthalide
haloalkynes
[2+2+2]

Supplementary materials

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CyclotrimerizationSI
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2C
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27
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