作者:Keiichi Ikeda、Tsumoru Morimoto、Kiyomi Kakiuchi
DOI:10.1021/jo1012288
日期:2010.9.17
The reaction of enynes with acetyl-masked aldoses in the presence of a rhodium(I) catalyst resulted in cyclocarbonylation, thus avoiding the direct use of carbon monoxide, to afford bicyclic cyclopentenones. In rhodium catalysis, aldoses serve as a carbon monoxide equivalent by donating their carbonyl moieties on the acyclic aldehyde form to enynes. A variety of aldoses, including d-glucose, d-mannose
在铑(I)催化剂存在下,烯炔与乙酰基掩盖的醛糖的反应导致环羰基化,从而避免了直接使用一氧化碳,得到双环环戊烯酮。在铑催化中,醛糖通过将其在无环醛形式上的羰基部分提供给烯炔而充当一氧化碳当量。可以使用多种醛糖,包括d-葡萄糖,d-甘露糖,d-半乳糖,d-木糖和d-核糖,作为羰基来源。使用该方法,各种烯类都以22-67%的收率被环羰基化。不对称变体也以中等至高对映选择性进行。