Synthetic studies on β-lactam antibiotics. 18. Convenient, stereocontrolled synthesis of 3-methyl 7α-methoxy-1-oxacephems
作者:Tsutomu Aoki、Mitsuru Yoshioka、Yuji Sendo、Wataru Nagata
DOI:10.1016/s0040-4039(01)86579-5
日期:——
Alcohols 4 and 8, prepared from 3, underwent completely stereospecific etherification to give 1-oxacephams 5 and 10, which were converted into the 1-oxacephem nucleus 1b via 6 and 1c. Functionalization at C-3′ in 6 and 1c was unsuccessful.
由3制备的醇4和8进行完全立体定向醚化,得到1-oxacephams 5和10,它们通过6和1c转变为1-oxacephem核1b。C-3'在6和1c中的功能化失败。