Preparation of 2-Thiazolines from (1,2)-Thioamido-Alcohols; DAST as a Useful Reagent

Abstract
Diethylamidosulfur trifluoride (DAST) is shown to be a valuable reagent for the ready access to 2-thiazolines 4a-f starting from the corresponding (1,2)-thioamido-alcohols 3a-f. This mild intramolecular cyclization is fast (< 1 h) and occurs at a temperature as low as -78 °C.

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