PAPER: Rearrangement of s-(2-aminoethyl) thiophosphates to n-(2-mercaptoethyl)phosphoramidates

Chen, M.; Maetzke, A.; Knak Jensen, S. J.; Gothelf, K. V.

Eur. J. Org. Chem. 2007, 5826–5833, doi: 10.1002/ejoc.200700646

Centre for DNA Nanotechnology at iNANO and Department of Chemistry, University of Aarhus, 8000 Aarhus C, Denmark

Abstract

A novel rearrangement of S-(2-aminoethyl) thiophosphates to N-(2-mercaptoethyl)phosphoramidates was discovered and developed. The reaction proceeds smoothly at room temperature under basic conditions and the resulting thiol could subsequently be alkylated. The reaction mechanism is investigated by electron structure calculations using density functional theory at the B3LYP/6-31G(d) and B3LYP/6-311+G(d,p) levels. The calculations indicate that the reaction proceeds in a two step process when two explicit solvent molecules are included. In the presence of water the rearrangement reaction proceeds in competition with hydrolysis

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