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2005
Triazole derivatives
R 0280
1,3-Dipolar Cycloaddition of Trimethylsilyl Azide to Propynals and Dimerization
1H-1,2,3-Triazole-5-carbaldehydes to Tricyclic Bis-hemiaminals. — Triazole25- 130 of
carbaldehydes (II), obtained by 1,3-dipolar cycloaddition of trimethylsilyl azide to
propynals (I), exist mainly in the monomeric form. According to IR and NMR data,
increase of the solvent polarity and temperature, as well as trimethylsilylation favors
their dimerization to corresponding tricyclic bis-hemiaminals [cf. (IV)]. —
(DEMINA, M. M.; NOVOPASHIN, P. S.; SARAPULOVA, G. I.; LARINA, L. I.;
SMOLIN, A. S.; FUNDAMENSKII, V. S.; KASHAEV, A. A.; MEDVEDEVA, A. S.;
Russ. J. Org. Chem. 40 (2004) 12, 1804-1809; A. E. Favorsky Inst. Chem., Sib.
Branch, Russ. Acad. Sci., Irkutsk 664033, Russia; Eng.) — R. Staver
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