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One-Pot Metal-Free Synthesis of 3-CF3-1,3-Oxazinopyridines by Reaction of Pyridines with CF3CO-Acetylenes.

ABSTRACT: The reaction of pyridines with trifluoroacetylated acetylenes was investigated. It was found that the reaction of various pyridines with two molecules of CF3CO-acetylenes proceeds under mild metal-free conditions. As a result, efficient stereoselective synthesis of 3-arylethynyl-3-trifluoromethyl-1,3-oxazinopyridines was elaborated. Target heterocycles can be prepared in up to quantitative yields.

SUBMITTER: Muzalevskiy VM 

PROVIDER: S-EPMC6804262 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature

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One-Pot Metal-Free Synthesis of 3-CF<sub>3</sub>-1,3-Oxazinopyridines by Reaction of Pyridines with CF<sub>3</sub>CO-Acetylenes.

Muzalevskiy Vasiliy M VM   Sizova Zoia A ZA   Belyaeva Kseniya V KV   Trofimov Boris A BA   Nenajdenko Valentine G VG  

Molecules (Basel, Switzerland) 20191006 19

The reaction of pyridines with trifluoroacetylated acetylenes was investigated. It was found that the reaction of various pyridines with two molecules of CF<sub>3</sub>CO-acetylenes proceeds under mild metal-free conditions. As a result, efficient stereoselective synthesis of 3-arylethynyl-3-trifluoromethyl-1,3-oxazinopyridines was elaborated. Target heterocycles can be prepared in up to quantitative yields. ...[more]

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