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A new, simple and efficient procedure for the preparation of secondary amides through internal condensation of acylmethanesulfonamides ammonium salts is described. The selective acylation of mixed primary–secondary amines could be an attractive application of the new method.
New, extended applications of a modified palladium catalysed reductive amination procedure are described; a mechanistic hypothesis alternative to the common imine pathway is proposed. This versatile method advances the usual reductive amination processes in terms of yield and shows high stereoselectivity whether applied to constrained carbonyl compounds.
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