TMG-promoted [3 + 2] organocatalytic 1,3-dipolarcycloaddition reactions of allyl ketones with in situ generated nitrileoxides have been developed. This strategy could generate 3,5-disubstituted isoxazolines in high yields and regioselectivities.
Reactions of heterocyclic cations with nitrogen-containing nucleophiles. 11. Reaction of 2,6-diphenylpyrylium perchlorate with primary amines, hydrazine, and hydroxylamine
作者:�. A. Zvezdina、A. N. Popova、A. I. Pyshchev、G. N. Dorofeenko
DOI:10.1007/bf00503547
日期:1982.4
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。