Rhodium(II)- and Copper(II)-Catalyzed Reactions of Enol Diazoacetates with Nitrones: Metal Carbene versus Lewis Acid Directed Pathways
作者:Yu Qian、Xinfang Xu、Xiaochen Wang、Peter J. Zavalij、Wenhao Hu、Michael P. Doyle
DOI:10.1002/anie.201202525
日期:2012.6.11
A complimentary cat.: Copper(II) hexafluoroantimonate catalyzes the formal [3+3] cycloaddition of Lewis acid activated nitrones and vinyl diazoacetates to produce 3,6‐dihydro‐1,2‐oxazines in yields of up to 96 % and diastereoselectivities greater than 25:1 (see scheme). This process compliments the metal carbene pathway that is catalyzed by rhodium(II) species.
一只免费的猫。:六氟锑酸铜(II)催化路易斯酸活化的硝酮和乙烯基重氮乙酸酯的正式[3 + 3]环加成反应,生成3,6-二氢-1,2-恶嗪,收率高达96%,非对映选择性大于25:1 (请参阅方案)。此过程补充了铑(II)物种催化的金属卡宾途径。