10.1016/S0040-4039(02)01451-X
The research focuses on the conversion of O-succinimidyl carbamates to N-(O-carbamoyl)-succinmonoamides and ureas, exploring the effects of N-substituents and reaction conditions on the reaction pathway. The study investigates how N-monoalkyl-O-succinimidyl carbamates react with primary and secondary amines to form ureas, while N,N-dialkyl-O-succinimidyl carbamates yield N-(O-carbamoyl)-succinmonoamides under the same conditions. Experiments involved model reactions with N,N-dibenzyl-O-succinimidyl carbamate and N-3,3-diphenylpropyl-O-succinimidyl carbamate, using 3,3-diphenylpropylamine as a nucleophile. The reactions were conducted with varying solvents and base concentrations to assess their impact on product formation. Analytical techniques such as high-resolution mass spectrometry (HRMS) and reverse-phase high-performance liquid chromatography (RP-HPLC) were employed to characterize the products and monitor reaction progress. The findings suggest that electronic effects of N-substituents play a significant role in determining the reaction pathway, with N-aryl-N-alkyl carbamates tending to produce a mixture of both urea and hydroxylamine derivatives.