The utility of vinyl ethers and vinyl esters in the Khand reaction. The value of vinyl esters as ethylene equivalents and a modified synthesis of (+)-taylorione as an example
作者:William J. Kerr、Mark McLaughlin、Peter L. Pauson、Sarah M. Robertson
DOI:10.1016/s0022-328x(01)00891-9
日期:2001.7
alkenes in the Khand cyclisation reaction has been studied. Although several vinyl ethers reacted to give the expected oxygenated cyclopentenone products, usually with good levels of regioselectivity, the use of vinyl esters was found to afford, as the major products, reduced cyclopentenones in which the carbon–oxygen bond had been cleaved. This unexpected reaction was developed into an alternative
已经研究了Khand环化反应中各种氧化烯烃的行为。尽管几种乙烯基醚反应生成预期的含氧环戊烯酮产物,通常具有良好的区域选择性,但发现使用乙烯基酯作为主要产物,可以还原其中的碳氧键已断裂的还原的环戊烯酮。这种出乎意料的反应已发展为在Khand反应中使用乙烯气体的替代方法,并发现可用于多种炔烃底物。然后扩展该方法以形成合成天然产物(+)- taylorione(和(+)- nortaylorione)的关键步骤。