1-Amino-2-propanol → 2-Propanol, 1-amino-, 2-(hydrogen sulfate)

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FIG. 7 shows another synthetic reaction scheme for preparation of an mPEG-DTB-ligand compound in accord with the invention. The details of the reaction procedure are given in Examples 4A-4B. Briefly, cold 1-amino-2-propanol was reacted with sulfuric acid to form 2-amino-1methylethyl hydrogen sulfate. This product was reacted with carbon disulfide and sodium hydroxide in aqueous ethanol to yield 5-methylthiazolidine-2-thione. An aqueous solution of hydrochloric acid was added to the 5-methylthiazolidine-2-thione and heated. After refluxing for one week, the product, 1-mercapto(methyl)ethyl ammonium chloride, was crystallized and recovered. This product was reacted with methoxy carbonylsulfenyl chloride to yield 2-(methoxycarbonyldithio)ethaneamine. Reaction of the 2-(methoxycarbonyldithio)ethaneamine with mPEG-chloroformate using the procedure described above with respect to FIG. 4 yields the desired mPEG-DTB-nitrophenyl compound suitable for reaction with a selected amine-containing lipid.

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