Mirzaei, Yousef R.; Balasubramaniam, T. N.; Lefler, Barbara J., Journal of Heterocyclic Chemistry, 1990, vol. 27, # 7, p. 2001 - 2004
作者:Mirzaei, Yousef R.、Balasubramaniam, T. N.、Lefler, Barbara J.、Natale, N. R.
DOI:——
日期:——
Metalation and Electrophilic Quenching of C-4 Functionalized Isoxazoles; VIII. Preparation of Derivatives of 5-Thioalkylisoxazoles
作者:T. N. Balasubramaniam、Yousef R. Mirzaei、N. R. Natale
DOI:10.1055/s-1990-27099
日期:——
The lateral metalation and electrophilic quenching of isoxazoles bearing electron withdrawing groups in the 4-position 1 with disulfides, represents a selective, direct and synthetically useful entry to the thioalkyl derivatives 2 (nine examples). One exception to the formation of monothioalkyl major products was observed for the dianion of 4-[(2-hydroxymethyl-1-pyrrolidinyl)carbonyl]-3,5-dimethylisoxazole (1i) which was found to produce the 5-[bis(phenylthio)methyl]isoxazole derivative 3i as the major isolated product (66%). Oxidation of 2a with 3-chloroperoxybenzoic acid (MCPBA) proceeds selectively at sulfur in the presence of both isoxazole and oxazoline nitrogens to give the corresponding sulfoxide 4a (56%) or sulfone 5a (72%), respectively.