Bo Yang, Xiang Fang, Xueyan Yang
2013
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Journal
Chinese Journal of Organic Chemistry
Abstract
An efficient and convenient protocol for the synthesis of 5-fluoroalkyl-2-oxazoline is described. The 1-allyl-3-arylurea was synthesized by the reaction of isocyanate with allyl amine in methylene chloride at room temperature. The reaction of 1-allyl-3-arylurea with fluoroalky iodide initiated by sodium dithionite in aqueous acetonitrile resulted in ad-ducts that undergoes a cyclization in water or DMF to form 5-fluoroalkyloxazoline with moderate yields. It was also found that the products can be more efficiently formed via an AIBN-initiated, one-pot addition-cyclization sequence from 1-allyl-3-arylurea with fluoroalkyl iodide.