Total synthesis of acosamine and daunosamine utilizing a diastereoselective intramolecular [3+2] cycloaddition
作者:P.M. Wovkulich、M.R. Uskoković
DOI:10.1016/s0040-4020(01)96700-6
日期:1985.1
acosamine (4) has been accomplished via a diastereoselective intramolecular nitrone-olefin cyclization. In the key step the chiral nitrone 12a cyclized to give two isoxazolidines 13a and 14a in an 82:18 ratio. Further elaboration of 13a led to daunosamine and acosamine. The effects of olefin substitution on the diastereoselectivity of the cycloaddition was also examined.
通过非对映选择性分子内的硝酮-烯烃环化反应已完成了道诺胺(3)和二十二胺(4)的全合成。在关键步骤中,手性硝酮12a环化以得到82:18比例的两个异恶唑烷13a和14a。对13a的进一步加工导致了道诺胺和二十二胺。还检查了烯烃取代对环加成的非对映选择性的影响。