Five-Membered Cyclic Nitronates in C-C Coupling with 1-(<i>tert</i>-Butyldimethylsilyloxy)-1-methoxyethylene
作者:Vladimir O. Smirnov、Alexander S. Sidorenkov、Yulia A. Khomutova、Sema L. Ioffe、Vladimir A. Tartakovsky
DOI:10.1002/ejoc.200900172
日期:2009.6
Five-membered cyclic nitronates 3 undergo TBSOTf-catalysed C–C coupling reactions with silyl ketene acetal 4 to give good to excellent yields of 3,3-disubstituted N-(OTBS)-isoxazolidines 5, which could not be obtained by previously known procedures. The problems of diastereoselectivity of the C–C coupling reactions are discussed. The transformations of the nitroso acetals 5 upon action of AcFOH/methanol
五元环状硝基化合物 3 与甲硅烷基乙烯酮缩醛 4 进行 TBSOTf 催化的 C-C 偶联反应,以产生良好或优异的 3,3-二取代 N-(OTBS)-异恶唑烷 5 产率,这是以前已知方法无法获得的. 讨论了 C-C 偶联反应的非对映选择性问题。亚硝基缩醛 5 在 AcFOH/甲醇或一些还原剂(H2/NiRa、LAH、Al/Hg)作用下的转化已被研究。 (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009 )