Programmed synthesis of arylthiazoles through sequential C–H couplings
作者:Satoshi Tani、Takahiro N. Uehara、Junichiro Yamaguchi、Kenichiro Itami
DOI:10.1039/c3sc52199k
日期:——
A programmed synthesis of privileged arylthiazoles via sequential C–Hcouplings catalyzed by palladium or nickel catalysts has been accomplished. This versatile protocol can supply all possible arylthiazole substitution patterns (2-aryl, 4-aryl, 5-aryl, 2,4-diaryl, 2,5-diaryl, 4,5-diaryl, and 2,4,5-triaryl) from an unfunctionalized thiazole platform by 11 distinct synthetic routes. We have generated
Brønsted acid-promoted thiazole synthesis under metal-free conditions using sulfur powder as the sulfur source
作者:Penghui Ni、Jing Tan、Rong Li、Huawen Huang、Feng Zhang、Guo-Jun Deng
DOI:10.1039/c9ra09656f
日期:——
acid-promoted sulfuration/annulation reaction for the one-pot synthesis of bis-substituted thiazoles from benzylamines, acetophenones, and sulfur powder has been developed. One C–N bond and multi C–S bonds were selectively formed in one pot. The choice of the Brønsted acid was the key to the high efficiency of this transformation under metal-free conditions.
A visible light-induced cascade cyclization of thioamides with alkynes was developed to synthesize 1,3-thiozoles. The sulfur radical generated from thioamide via the single-electron transfer (SET) pathway was promoted by photocatalysis as a key intermediate in this reaction. When bromoalkynes were used as the substrate, the self-coupling products 1,1-dibromo-1-en-3-ynes were obtained in moderate yields
In this paper, the [3 + 2] cycloaddition reaction of thiobenzoyl group derivatives with sulfoxonium ylide was studied, which can directly synthesize 2,4-diarylthiazoles with different structures. Compared with the traditional reaction of producing thiazole, using palladium catalysts is able to make the reaction milder and lower in cost. Thus, a group of 2,4-diarylthiazoles can be easily synthesized