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1 Yamins Laboratory for Surgical Research, Beth Israel Hospital, and the Department of Surgery, Harvard Medical School, Boston, Mass.
2 Lakeside Hospital, Cleveland, Ohio
3 School of Science, Brandeis University, Waltham, Mass.
A comparison of the toxicity of mice of various secondary nitrogen mustards was made with the toxicity of methyl bis (
-chloroethyl) amine. These secondary nitrogen mustards were capable of intramolecular cyclization to yield potent tertiary amine mustards. The secondary nitrogen mustards when converted to N-phosphonyl derivatives were much less toxic. Suitable phosphoryl derivatives of the new secondary nitrogen mustards may turn out to be chemotherapeutic agents for tumors with high phosphamidase activity.