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Mass Spectra of New Heterocycles: XX. Electron Impact and Chemical Ionization Mass Spectra of 5-(Prop-2-yn-1-ylsulfanyl)-1H-pyrrol-2-amines

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Abstract

Electron impact (70 eV) and chemical ionization (methane as reactant gas) mass spectra of 1-alkyl- and 1-[2-(vinyloxy)ethyl]-5-(prop-2-yn-1-ylsulfanyl)-1H-pyrrol-2-amines have been studied for the first time. The title compounds under electron impact form stable molecular ions which decompose mainly along pathways typical of the molecular ions derived from the corresponding intramolecular cyclization products, 7-alkyl- and 7-[2-(vinyloxy)ethyl]-2,7-dihydrothiopyrano[2,3-b]pyrrol-6-amines. In addition, fragment ions that could be formed only via decomposition of unrearranged molecular ion were detected. The main fragmentation pathway of their molecular ions involves cleavage of the N1-CAlk bond with the formation of stable [M − R3]+ ions (Irel 85–100%) {except for N,N-diethyl- and N,N-dipropyl-1-[2-(vinyloxy)emyl]-5-(prop-2-yn-1-ylsulfanyl)-1H-pyrrol-2-amines}. The results of quantum chemical calculations at the B3LYP/6-311+G(d,p) level of theory are consistent with the experimental data. In the chemical ionization mass spectra of 5-(prop-2-yn-1-ylsulfanyl)-1H-pyrrol-2-amines, the major peaks were those corresponding to M+· (Irel 65–100%) and [M + H]+ (Irel 75–100%). The title compounds have been found to undergo partial (5–10%) thermally induced isomerization to 5-(prop-1-yn-1-ylsulfanyl)-1H-pyrrol-2-amines under the chemical ionization conditions.

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Acknowledgments

This study was performed using the facilities of the Baikal Joint Analytical Center, Siberian Branch, Russian Academy of Sciences.

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  1. Favorskii Irkutsk Institute of Chemistry, Siberian Branch, Russian Academy of Sciences, Irkutsk, 664033, Russia

    L. V. Klyba, N. A. Nedolya, E. R. Sanzheeva, O. A. Tarasova & V. A. Shagun

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Correspondence to L. V. Klyba.

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The authors declare the absence of conflict of interests.

Russian Text © The Author(s), 2019, published in Zhurnal Organicheskoi Khimii, 2019, Vol. 55, No. 12, pp. 1857–1869.

For communication XIX, see [1].

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Klyba, L.V., Nedolya, N.A., Sanzheeva, E.R. et al. Mass Spectra of New Heterocycles: XX. Electron Impact and Chemical Ionization Mass Spectra of 5-(Prop-2-yn-1-ylsulfanyl)-1H-pyrrol-2-amines. Russ J Org Chem 55, 1853–1863 (2019). https://doi.org/10.1134/S1070428019120078

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