Extracyclic Stereocontrol in Addition Reaction of Crotylsilanes with 2-Substituted 2-Cyclopentenones. Stereodivergent Synthesis of (+)-Neonepetalactone and (+)-Isoneoneptalactone
作者:Li-Rui Pan、Takashi Tokoroyama
DOI:10.1246/cl.1990.1999
日期:1990.11
The additionreaction of E- and Z-crotylsilanes with 2-substituted 2-cyclopentenones showed the preference of erythro and threo products respectively. The refinement of the selectivity was investigated and the result was utilized for efficient syntheses of the title natural products.
A Short Asymmetric Synthesis of (-)-Neonepetalactone
作者:Dieter Enders、Anja Kaiser
DOI:10.3987/com-96-s2
日期:——
(4 (S) under bar,4a (R) under bar)-Neonepetalactone (6) was synthesized in high diastereomeric and enantiomeric purity (de, ee greater than or equal to 96%) in a four step procedure. Key step of the total synthesis is the Michael addition of metalated propanal SAMP-hydrazone (((S) under bar)-1) to 2-cyclopentenecarboxylate (2).
(4(S)、4a(R)-Neonepetalactone(6)通过四步合成过程,在高非对映异构体和对映体纯度(de, ee ≥ 96%)下成功合成。该化合物的总合成关键步骤是金属化的丙酮醛SAMP-腙((S)-1)与环戊烯羧酸酯(2)之间的迈克尔加成反应。
Revisions of the absolute configurations of C-8 methyl groups in dehydroiridodiol, neonepetalactone, and matatabiether from Actinidia polygama miq
The absoluteconfigurations of C-8 Me groups in dehydro-iridodiol, neonepetalactone, and matatabiether isolated from the cat- and lacewmg-attracting plant ActinidiapolygamaMiq. were revised to the S configurations on the basis of chemical transformations and unambiguous syntheses.