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The products of Claisen-type addition reactions of DPL-stabilized amino acid carbanions. (A) Products from addition of the DPL-stabilized glycine carbanion to DPL.64 (B) Products from addition of the α-pyridyl carbon of the DPL-stabilized alanine carbanion to DPL.66 (C) Products from addition of the DPL stabilized glycine carbanion to the α-imino carbon of the DPL-glycine iminium cation.67
