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Iron(III) chloride as mild catalyst for the dearomatizing cyclization of N-acylindoles

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Iron(III) chloride as mild catalyst for the dearomatizing cyclization of N-acylindoles

A catalytic approach for the preparation of indolines by dearomatizing cyclization is presented. FeCl3 acts as a catalyst to afford tetracyclic 5a,6-dihydro-12H-indolo[2,1-b][1,3]benzoxazin-12-ones in good yields. The cyclization also proceeds with tosylamides forming C-N bonds in 53 % yield.

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