Diastereoselective cycloadditions of chiral homoallylic alcohols with benzonitrile oxide
作者:Martin G. Kociolek、Chayanant Hongfa
DOI:10.1016/s0040-4039(03)00100-x
日期:2003.2
The first diastereoselective cycloaddition of a nitrile oxide with a homoallylic alcohol is discussed. The reaction of benzonitrileoxide with the magnesium alkoxides of chiral homoallylic alcohols has been shown to proceed with good diastereoselectivity, favoring the syn isomer of the resulting 2-isoxazoline.
KANEMASA, SHUJI;ASAI, YOSHIHIKO;TANAKA, JUNJI, BULL. CHEM. SOC. JAP., 64,(1991) N, C. 375-380
作者:KANEMASA, SHUJI、ASAI, YOSHIHIKO、TANAKA, JUNJI
DOI:——
日期:——
Synthesis of Substituted Pyridines by a Cycloaddition Route Using Nitrile Oxides and Homoallyl Alcohols
作者:Shuji Kanemasa、Yoshihiko Asai、Junji Tanaka
DOI:10.1246/bcsj.64.375
日期:1991.2
Cycloadditions of nitrile oxides with unprotected homoallyl alcohols, followed by Swern oxidations, lead to 5-(2-oxoalkyl)-2-isoxazolines. Subsequent Raney Ni reduction of the resulting heterocycles in ethanol in the presence of excess tetrafluoroboric acid affords substituted pyridine derivatives.
腈氧化物与未保护的高烯丙醇的环加成,然后是 Swern 氧化,产生 5-(2-氧代烷基)-2-异恶唑啉。随后在过量四氟硼酸存在下,在乙醇中对所得杂环进行 Raney Ni 还原,得到取代的吡啶衍生物。