The subtle co-catalytic intervention of benzophenone in radical cation mediated cyclization - an improved synthesis of 2-(3 ',4 '-Dimethoxyphenyl) indoline
The addition of benzophenone to a FeCl(3)/CH(2)Cl(2) mixture in the presence of 3',4'-dimethoxy-2-acetamidostilbene 17 unexpectedly leads to a dramatic improvement in yield of the indoline 20 from 38% (previously reported by us) to 75.4%, after careful examination of a variety of reaction...
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