Conformationally Constrained Amino Acids.¹ on the Synthesis of 4-Substituted 8-Membered Cyclic Tryptophan Derivatives

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• Energy calculations for cyclization of 5 to 6 via the tetrahedral intermediate revealed 6 is 75 Kcal/mol higher in energy than 5 with an activation energy of DG∗=12.2 kcal/mol at 298°K and 79 Kcal/mol higher in energy with an activation energy of DG∗=13.2 Kcal/mol at 410°K
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