13C-13C spin-spin coupling constants in structural studies: XLIII. Stereochemical study on functionalized 3-iminopyrrolizines
摘要:
Three 1-ethylsulfanyl-3-imino-3H-pyrrolizine-2-carboxamides were synthesized by intramolecular cyclization of substituted (2Z)-2-cyano-3-ethylsulfanyl-3-(1H-pyrrol-2-yl)prop-2-enamides. The products were assigned syn configuration at the C = N bond and preferential s-cis orientation of the carbamoyl group on the basis of the experimental C-13-C-13 coupling constants and high-level nonempirical quantum-chemical calculations.
Facile coupling of 2-(1-ethylthioethenyl)pyrroles with amines: A route to 2-(1-aminoethenyl)pyrroles and 1-amino-3-iminopyrrolizines
作者:Boris A. Trofimov、Lyubov' N. Sobenina、Al'bina I. Mikhaleva、Ol'Ga V. Petrova、Vladislav N. Drichkov、Igor A. Ushakov、Ol'Ga A. Tarasova、Darya-Suren D. Toryashinova、Yuriy Yu. Rusakov、Leonid B. Krivdin
DOI:10.1002/jhet.5570440301
日期:2007.5
2-(2-Cyano-1-ethylthioethenyl)pyrroles are readily coupled (50–55°) with primary and secondary amines at the position 1 of the ethenyl moiety to eliminate ethanethiol and afford 2-(1-amino-2-cyanoethenyl)pyrroles and/or their cyclic isomers - functionalized 1-amino-3-iminopyrrolizines in good to high yields.
Synthesis of 3- and 5-amino-5-(3)-(pyrrol-2-yl)isoxazoles
作者:Lyubov' N. Sobenina、Vladislav N. Drichkov、Al'bina I. Mikhaleva、Olga V. Petrova、Igor A. Ushakov、Boris A. Trofimov
DOI:10.1016/j.tet.2005.03.031
日期:2005.5
5-Amino-3-(pyrrol-2-yl)isoxazoles were selectively prepared by the reaction of 2-(2,2-dicyano-1-ethylthioethenyl)pyrroles with hydroxylamine in methanol. Under analogous conditions, 2-(2-carbamoyl-2-cyano-1-ethylthioethenyl) pyrroles with hydroxylamine gave 5-aminoisoxazoles and their structural isomers, 3-aminoisoxazoles (3–5% yield). The latter were selectively prepared by reacting 2-(2-carbamoy
13C-13C spin-spin coupling constants in structural studies: XLIII. Stereochemical study on functionalized 3-iminopyrrolizines
作者:S. S. Khutsishvili、Yu. Yu. Rusakov、L. B. Krivdin、N. V. Istomina、O. V. Petrova、L. N. Sobenina、A. I. Mikhaleva
DOI:10.1134/s1070428008090157
日期:2008.9
Three 1-ethylsulfanyl-3-imino-3H-pyrrolizine-2-carboxamides were synthesized by intramolecular cyclization of substituted (2Z)-2-cyano-3-ethylsulfanyl-3-(1H-pyrrol-2-yl)prop-2-enamides. The products were assigned syn configuration at the C = N bond and preferential s-cis orientation of the carbamoyl group on the basis of the experimental C-13-C-13 coupling constants and high-level nonempirical quantum-chemical calculations.