New C−C Coupling Reaction of Cyclic Nitronates with Carbon Nucleophiles. Umpolung of the Conventional Reactivity of Nitronates
作者:Vladimir O. Smirnov、Sema L. Ioffe、Alexander A. Tishkov、Yulia A. Khomutova、Ivan D. Nesterov、Michael Yu. Antipin、William A. Smit、Vladimir A. Tartakovsky
DOI:10.1021/jo048944k
日期:2004.11.1
Cyclic six-membered nitronates 1 are involved in diastereoselective C−Ccoupling reactions with various nucleophiles in the presence of either catalytic or stoichiometric amounts of TBDMSOTf to give the previously unknown N-siloxytetrahydrooxazines. The intermediacy of N,N-bis(oxy)iminium cations was proven by NMR data.