Process for preparing 2-methoxyisobutylisonitrile
AssigneeE. R. Squibb & Sons, Inc.
InventorKondareddiar Ramalingham
Life of this patent
Estimating the term…
Abstract
A new process for preparing 2-methoxyisobutylisonitrile is described. 2-methoxyisobutylisonitrile is used in the preparation of Tc-99m hexakis (2-methoxyisobutylisonitrile). This cationic complex is useful as a myocardial perfusion agent.
Claims4
A process for preparing a compound of the formula ##STR2## which comprises the steps of (A) methylating a compound of formula ##STR3## with an anhydrous methylating agent in the presence of zinc chloride at a temperature of about 60.degree. C. for about twelve hours to form a compound of the formula ##STR4## and (B) reducing the above ether with a reducing agent in the presence of ether for about eight hours to form a compound of the formula ##STR5## and (C) formylating the above amine with a formylating agent in the presence of a catalytic amount of p-toluenesulphonic acid at about 0.degree. C. for about sixteen hours to form a compound of the formula ##STR6## and (D) reacting the above amide with trichloromethylchloroformate in the presence of triethylamine at a temperature of about minus 40.degree. C. for about one hour to form the desired isonitrile.
Dependencies are inferred from the claim text.