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.
外消旋α-甲氧基环烷酮肟醋酸酯 1 与 (2R,4R)-2,4-双三甲基硅氧基戊烷在一定量的三甲基硅烷基三氟甲基硅烷(TMSOTf)催化剂存在下进行处理,得到手性乙缩醛中间体 3,再与含硅亲核物反应,通过一锅操作得到手性ω-氰基化合物 4。