cyclisation of the ketoaldehyde into azaspiroenone and nitrogen deprotection was performed in basic medium. The N-benzylation of this enone gave the known key intermediate of total synthesis of (±)-perhydrohistrionicotoxin.
在催化量的
三氟化硼醚合物存在下,带有氮原子的甲
硅烷基烯醇醚与
半缩醛乙烯酮的反应产生相应的酮醛。酮醛环化成氮杂螺烯酮和氮脱保护在碱性
培养基中进行。该烯酮的 N-苄基化产生了 (±)-全氢组
氨酸毒素全合成的已知关键中间体。