All articles of this category N -(Cyclohex-1-enyl)-α-(methylthio)acetamides 1 , upon treatment with Mn(OAc) 3 in the presence of Cu(OAc) 2 , underwent cyclization in a 5- endo - trig manner to give 1,4,5,6-tetrahydro-3-methylthio-2 H -indol-2-ones 2 . The radical mechanism has been proposed for the cyclization of 1 . radical cyclization - manganese(III) acetate - copper(II) acetate - carbamoylmethyl radical - neophyl rearrangement
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Ishibashi et al. (1999) studied this question.