作者:Bernd Schmidt、Anne Biernat
DOI:10.1002/chem.200800567
日期:2008.7.7
synthesized de novo as single isomers starting from ethyl lactate by using the tandem RCM-isomerization reaction as the key step. Different relative configurations become accessible by addition of vinyl- or allyl-metal compounds to protected lactaldehydes under Cram-chelate or Felkin-Anh control. The concept is exemplified for glycals of L-rhodinose and L-amicetose, as well as for ring-expanded non-natural
通过使用串联RCM异构化反应作为关键步骤,从乳酸乙酯开始作为单一异构体从头合成了受保护的3,6-二脱氧乙二醇。通过在Cram-螯合物或Felkin-Anh控制下将乙烯基或烯丙基金属化合物添加到受保护的乳醛中,可获得不同的相对构型。该概念以L-罗丹糖和L-乙酰糖的糖基以及其环扩展的非天然类似物为例。这种新的缩醛方法也适用于通过重复策略合成二糖缩醛,例如L-若丹糖及其非天然扩环类似物的二聚体。