Synthese des Aroxy(alcoxy)sulfonyl-5-F-hexyl Oxazolidin-2-ones
摘要:
The addition of 1-F-hexyl-2-bromoethanol and 2-F-hexyl-2-bromoethanol to aroxyor alkoxysulfonyl isocyanates in anhydrous ether allowed the preparation of the corresponding brominated F-alkyl carbamates. In the case of 1-F-hexyl-2-bromoethanol, the easy cyclization of carbamates to F-alkyl oxazolidin-2-ones was achieved by the action of triethylamine in refluxing acetone.
Reactivity of F-alkyl oxirans was investigated towards nucleophilic and electrophilic reagents. They are quite inert in acid medium. On the other hand, in basic medium they lead to regiospecific opening reactions. Their reactions with organometalliccompounds need extreme conditions : with Grignardreagents they sometimes lead to unexpected results.