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.
A simple and economic chiral synthesis of optically active methyl L-acosaminide and methyl L-daunosaminide from propenyl acetate, said methyl L-acosaminide and methyl L-daunosaminide being coupling agents for the production of known antitumor agents.