Cyclization of Isothiosemicarbazones. III. Formation of Thiazolines and Thiazoles through Potential Sulfonium Salts from<i>N</i>,<i>S</i>-Disubstituted Isothiosemicarbazones
作者:Chiji Yamazaki
DOI:10.1246/bcsj.53.3289
日期:1980.11
The reaction of 3,4-disubstituted isothiosemicarbazones with α-bromo ketones led to the formation of 4-thiazoline derivatives, the substituents on the sulfur atom being cleaved as bromides. They are identical with the compounds obtained by the condensation of the corresponding thiosemicarbazones, having significantly lower E⁄Z ratios in certain products than in those from thiosemicarbazones. The yields