Total Synthesis of (−)-Lasubine II by the Conjugate Addition and Intramolecular Acylation of an Amino Ester with an Acetylenic Sulfone
作者:Thomas G. Back、Michael D. Hamilton
DOI:10.1021/ol0258482
日期:2002.5.1
[reaction: see text] The conjugate addition of methyl (S)-(2-piperidyl)acetate (3) to 2-(3,4-dimethoxyphenyl)-1-(p-toluenesulfonyl)ethyne (4), followed by LDA-promoted intramolecular acylation, stereoselective reduction, and desulfonylation, afforded (-)-lasubine II.
[反应:参见文本]将(S)-(2-哌啶基)乙酸甲酯(3)共轭添加到2-(3,4-二甲氧基苯基)-1-(对甲苯磺酰基)乙炔(4)中,然后进行LDA促进分子内酰化,立体选择性还原和去磺酰化,得到(-)-lasubine II。