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A novel and efficient synthesis of sulfur-containing heterocycles from phenol ethers bearing an alkyl sulfide sidechain using a combined reagent of a hypervalent iodine(u1) species and BF3.Et20 is described.

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Novel and Efficient Synthesis of Pyrroloiminoquinones Using a Hypervalent Iodine(III) Reagent.-A novel and efficient route to pyrroloiminoquinones (II) involving the intramolecular cyclization of 3-(azidoethyl)indoles (I) mediated by a hypervalent iodine (III) reagent is presented. In some cases the N-1 protecting group of the indoles (III) is cleaved off under the reaction conditions to give the pyrroloiminoquinone (IV). -(KITA, Y.; WATANABE, H.; EGI, M.; SAIKI, T.; FUKUOKA, Y.; TOHMA, H.; J. Chem. Soc., Perkin Trans. 1 [old] (1998) 4, 635-636; Fac. Pharm. Sci.,