Organic synthesis utilizing Beckmann fragmentation: new carbon–carbon bond formation by the reaction of α-alkoxycycloalkanone oxime acetates with organoaluminium reagents
作者:Hiromichi Fujioka、Takeshi Yamanaka、Kazuhiro Takuma、Makoto Miyazaki、Yasuyuki Kita
DOI:10.1039/c39910000533
日期:——
The reaction of α-alkoxycycloalkanone oxime acetates 1 with organoaluminium reagents caused Beckmann fragmentation and subsequent carbonâcarbon bond formation to give various types of Ï-cyano-α-alkyl (or alkynyl)ethers 2 in high yields.
Organic synthesis utilizing Beckmann fragmentation. Asymmetric carbon-carbon bond formation via chiral acetal intermediates.
作者:Hiromichi FUJIOKA、Hidetoshi KITAGAWA、Takeshi YAMANAKA、Yasuyuki KITA
DOI:10.1248/cpb.40.3118
日期:——
Treatment of racemic α-methoxycycloalkanone oxime acetates 1 with (2R, 4R)-2, 4-bistrimethyl-silyloxypentane in the presence of a catalytic amount of trimethylsilyl triflate (TMSOTf) afforded the chiral acetal intermediates 3, which were reacted with silicon-containing nucleophiles to give the chiral ω-cyano compounds 4, in a one-pot operation.