One-Pot Addition-Intramolecular N-Cyclization of Carbamates Mediated by Alkali Metallic Reagents as an Approach to 4-(Fluoroalkyl)oxazolidin-2-ones
作者:Xiang Fang、Fan-Hong Wu、Xue-Yan Yang、Zheng-Hua Ju、Yun-Li Hu
DOI:10.1055/s-0030-1260239
日期:2011.11
straightforward strategy for the synthesis of 4-(fluoroalkyl)oxazolidin-2-ones via one-pot addition-intramolecular N-cyclization of allyl carbamates with fluoroalkyliodides is presented. The reaction proceeded in moderate to good yield through regiocontrol and an increase in the reactivity of the ambident nucleophiles by the use of alkali metallic reagents. allyl carbamates - 4-(fluoroalkyl)oxazolidin-2-ones -
A new and general method of iodine-mediated cyclization reactions of allyl or homoallyl carbamates, ureas, and amides was found to give N-cyclized products as single regioisomers. The present reaction proceeded in good yield through regiocontrol (N-cyclization > O-cyclization) and the increase in the reactivity of an ambident nucleophile by a basic metallic reagent. The N-cyclization selectivity was