A process for the preparation of compounds of the formula I shown in Fig. 1 of the accompanying drawings, wherein n is 0 or 1 and R represents the formula shown in Fig. 5, 6 or 7 and the nontoxic, pharmaceutically acceptable salts thereof, which process comprises reacting a compound of the formula II shown in Fig. 2, wherein R is as defined above, or a salt or an easily hydrolyzed ester thereof, with an acid of the formula III shown in Fig. 3, wherein B is a blocking group such as hereinbefore defined and n Is as described above, or with its functional equivalent as an acylating agent for a primary amino group, and subsequently removing said blocking group by methods known per se.
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