Add time:09/06/2019         Source:sciencedirect.com

The reaction of 3-nitro-2-trifluoro(trichloro)methyl- and 3-nitro-2-phenyl-2H-chromenes with 1-morpholinocyclopentene under the conditions of kinetic or thermodynamic control led to the formation of products due to enamine addition at the C-4 atom of chromene as individual cis,trans- or trans,trans-isomers, differing by the position of double bond in the enamine moiety. Hydrolysis of these compounds in dilute HCl did not cause changes of pyran ring configuration and provided the respective 4-(cyclopentanon-2-yl)chromanes with anti-configuration of hydrogen atoms at the С-4 and С-2′ atoms. Stereochemistry of the obtained compounds was confirmed by X-ray structural analysis.

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