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Letters in Drug Design & Discovery


ISSN (Print): 1570-1808
ISSN (Online): 1875-628X

Two Identical Twin Nitrogen Mustard Agents that Express Rapid Alkylation Activity at Physiological pH 7.4 and 37°C

Author(s): Ronald Bartzatt and Laura Donigan

Volume 1, Issue 1, 2004

Page: [78 - 83] Pages: 6

DOI: 10.2174/1570180043485789


Two nitrogen mustard (N-mustard ) agents were synthesized utilizing ethylene diamine and hexane diamine as the parent compounds. These N-mustard agents were solids at 25°C and stable while stored dry at -10°C. The two N-mustards assumed the configuration of identical twin drugs which when placed in aqueous solution were highly reactive. Both N-mustards were soluble in aqueous NaHCO3 buffer and expressed alkylation activity directed towards a nucleophilic primary amine target (4-chloroaniline) at blood pH 7.4 and 37°C. Utilizing the fluorescent probe fluorescamine, which is highly specific for primary amines, the quantity of unreacted nucleophilic 4-chloroaniline remaining after a known time period was determined. This enabled the calculation of rate constants and the determination of rate equation for alkylation to be first-order for N,N,N,N-tetrakis(2-chloroethyl)ethane-1,2-diamine and zero-order for N,N,N,N- tetrakis(2-chloroethyl)hexane-1,6-diamine. Molecular property descriptors such as Log P, parachor, molar volume, molar refractivity, dipole, molecular volume & area, and polar surface area were calculated for comparison. Zero violations of the Rule of 5 indicates these two mustard agents will have good bioavailability and good bioactivity.

Keywords: nitrogen mustard, identical twin drug, alkylation

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