Author's Organization:Central Research Laboratories, Sankyo Co., Ltd. Central Research Laboratories, Sankyo Co., Ltd. Central Research Laboratories, Sankyo Co., Ltd. Central Research Laboratories, Sankyo Co., Ltd. Central Research Laboratories, Sankyo Co., Ltd.
It was shown that the 3'and 4'hydroxy groups of N-protected butirosin or kanamycin derivatives resist benzoylation in an aqueous medium, furnishing an effective method for chemical modifications of these antibiotics.