Cyclization of N,N-diethylgeranylamine N-oxide in one-pot operation: preparation of cyclic terpenoid-aroma chemicals
作者:Kunihiko Takabe、Takashi Yamada、Takenori Miyamoto、Nobuyuki Mase
DOI:10.1016/j.tetlet.2008.08.001
日期:2008.10
Acid promoted cyclization of the geranylamine N-oxide (E)-4 followed by base-catalyzed intramolecular aldol condensation afforded 1-acetyl-4,4-dimethyl-1-cyclohexene (7) in one-pot operation. Reduction of 7, which possess strong fruity odor, followed by lipase-catalyzed kinetic resolution furnished the acetate (R)-26 (>49.9% yield, >99% ee) and the recovered alcohol (S)-25 (>49.9% yield, >99% ee, herbal
酸促进香叶胺N-氧化物(E)-4的环化,然后通过碱催化的分子内羟醛缩合反应以一锅操作得到1-乙酰基-4,4-二甲基-1-环己烯(7)。还原7,具有强烈的果味,然后进行脂肪酶催化的动力学拆分,得到乙酸酯(R)-26(> 49.9%收率,> 99%ee)和回收的醇(S)-25(> 49.9%收率) ,> 99%ee,草本气味)。