Thiazole as Leaving Group. Thermal Elimination from Thiazolylketoses
摘要:
Heating thiazolylketofuranoses and -ketopyranoses in refluxing toluene results in the elimination of thiazole and formation of the corresponding sugar lactones in nearly quantitative yield. The same reaction does not occur with 1-O-acetyl and 1-O-trimethylsilyl derivatives. Also model furyl- and thienylketofuranoses and various thiazolyl alcohols proved to be stable under the above thermolysis conditions. A possible mechanism of the observed thermolysis of thiazolylketoses involves the thiazolium 2-ylide as the actual leaving group.
Fluoride mediated reactions of lactones with silyl ketene acetals
作者:René Csuk、Martina Schaade
DOI:10.1016/s0040-4020(01)87014-9
日期:1994.3
Aldolisation reactions of silyl keteneacetals with lactone carbonyls can be performed under very mild conditions in good yields in the presence of 5–10 mol-% of TAS-TMSF2.