| 摘要 |
<p>Title cpds. have formula (I), where Ra1 is an amino-gp. protector and Rb1 is H or acyl -S-CR3R4-CHR5-O-COX (II) or Ra1 and Rb1 together form a bivalent amino-gp. protector; Ra, Rb and Rc are hydrocarbon radicals opt. substd. R2 is a carboxyl-gp. protector R3 and R4 are H or an aliphatic hydrocarbon radical opt. substd; R5 is H or an aliphatic or araliphatic hydrocarbon radical opt. substd. They are prepd. from (II), where X is an etherified SH or OH gp. such that the COX gp. is removable under moderate conditions not affecting the gp; COORa2. (II) are synthesised from penicillin-type cpds.</p> |
