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Alcohols for alkylation! The first homogeneous‐catalyzed N‐alkylations of indoles with aliphatic alcohols proceed under transfer hydrogenation conditions. By the use of the Shvo catalyst and p‐toluenesulfonic acid (PTSA) this atom‐efficient reaction occurs highly selectively with water formed as the only byproduct (see scheme).
Borrowing hydrogen catalysis for an environmentally benign N‐alkylation of indoles with alcohols is described in a joint effort by M. Beller, J. Williams, and co‐workers in their Communication on page 3590 ff. This novel procedure occurs through an unusual “borrowing hydrogen” methodology by use of the Shvo catalyst. The protocol is operationally simple and mechanistically involves an in situ transfer...
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