A diastereocontrolled synthesis of the spiroketal sub-unit of 22,23-dihydroavermectin B1b has been developed using a formal double condensation at both ends of pentane 2,4-dione with intermediate formation of the ketal .
利用戊烷2,4-二酮的戊端的正式双缩合和缩酮的中间形成,开发了非对映体合成的22,23-dihydroavermectin B 1b的spiroketal亚基。
Synthesis of the spiroketal fragment of avermectin B1b
作者:Michael T. Crimmins、Rosemary O'Mahony
DOI:10.1016/s0040-4039(01)93836-5
日期:1989.1
A new synthesis of the spiroketal fragment of the potent antiparasiticagent, avermectin B1b, utilizing an improved procedure for the preparation of unsaturated spiroketals from lactones is described.