Facile Synthesis of 2,5-Disubstituted Thiazoles from Terminal Alkynes, Sulfonyl Azides, and Thionoesters
作者:Tomoya Miura、Yuuta Funakoshi、Yoshikazu Fujimoto、Junki Nakahashi、Masahiro Murakami
DOI:10.1021/acs.orglett.5b00960
日期:2015.5.15
A sequential procedure for the synthesis of 2,5-disubstituted thiazoles from terminal alkynes, sulfonyl azides, and thionoesters is reported. A copper(I)-catalyzed 1,3-dipolar cycloaddition of terminal alkynes with sulfonyl azides affords 1-sulfonyl-1,2,3-triazoles, which then react with thionoesters in the presence of a rhodium(II) catalyst. The resulting 3-sulfonyl-4-thiazolines subsequently aromatize
据报道从末端炔烃,磺酰基叠氮化物和硫代磺酸酯合成2,5-二取代的噻唑的顺序方法。末端炔烃与磺酰基叠氮化物的铜(I)催化的1,3-偶极环加成反应生成1-磺酰基-1,2,3-三唑,然后在铑(II)催化剂存在下与硫磺酸酯反应。随后通过消除磺酰基基团将所得的3-磺酰基-4-噻唑啉芳香化为相应的2,5-二取代的噻唑。