Abstract
The title synthesis was achieved in eight steps from (S)-5-aminoindoline (S)- 4 by a method featuring sequential dehydrogenation, double bond isomerization, and oxidative cyclization of (S)-5-[(1-methoxycarbonylethyl)amino]indoline 5 as the key steps. The sequential reaction was effected by using MnO 2-Pd(OAc) 2 as the oxidizing agent in the presence of an acid catalyst.
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