A Highly Diastereoselective, Tandem Mukaiyama Aldol-Lactonization Route to β-Lactones: Application to a Concise Synthesis of the Potent Pancreatic Lipase Inhibitor, (−)-Panclicin D
Synthesis and evaluation of hermitamides A and B as human voltage-gated sodium channel blockers
作者:Eliseu O. De Oliveira、Kristin M. Graf、Manoj K. Patel、Aparna Baheti、Hye-Sik Kong、Linda H. MacArthur、Sivanesan Dakshanamurthy、Kan Wang、Milton L. Brown、Mikell Paige
DOI:10.1016/j.bmc.2011.05.043
日期:2011.7
hermitamides are ligands for the human voltage-gated sodiumchannel (hNaV) based on their structural similarity to the jamaicamides. Herein, we describe the nonracemic total synthesis of hermitamides A and B and their epimers. We report the ability of the hermitamides to displace [3H]-BTX at 10 μM more potently than phenytoin, a clinically used sodiumchannelblocker. We also present a potential binding mode
Hermitamides A 和 B 是从巴布亚新几内亚海洋蓝藻Lyngbya majuscula 的集合中分离出来的脂肽。我们假设 Hermitamides 是人类电压门控钠通道 (hNa V ) 的配体,这是基于它们与牙买加酰胺的结构相似性。在此,我们描述了hermitamides A 和B 及其差向异构体的非外消旋全合成。我们报告了 Hermitamides比苯妥英(一种临床使用的钠通道阻滞剂)更有效地置换 10 μM 的[ 3 H]-BTX的能力。我们还在BTX 结合位点和电生理学中展示了 ( S )-hermitamide B的潜在结合模式,表明这些化合物是 hNav1.2 电压门控钠通道的有效阻滞剂。
Total synthesis of racemic and (R) and (S)-4-methoxyalkanoic acids and their antifungal activity
The totalsynthesis of 4-methoxydecanoic acid and 4-methoxyundecanoic acid in racemic and stereoselective [(R) and (S)] forms has been accomplished. For stereoselective synthesis of the compounds (S) and (R)-BINOL complexes have been used to generate the required chiral centres. The antifungal activity of these compounds has been studied against different organisms and the results were found to be impressive
Convergent synthesis of panclicin-D via intramolecular SN2 displacement approach
作者:Jhillu Singh Yadav、Soma Shekar Dachavaram、Adithya Peddapuram、Saibal Das
DOI:10.1016/j.tetlet.2014.02.010
日期:2014.3
A convergent enantioselective synthesis of panclicin-D has been reported from simple octanal using syn aldol reaction via intramolecular SN2 displacement reaction for the first time towards the construction of anti-β-lactones in panclicin-D. The key steps involved are C-allylation, asymmetric aldolization under Crimmins condition, intramolecular SN2 displacement, and Mitsunobu esterification reaction
会聚对映选择性panclicin-d的合成已经从简单的辛醛使用已报道顺通过醛醇缩合反应的分子内小号Ñ首次向抗β内酯在panclicin-d施工2置换反应。涉及的关键步骤是C-烯丙基化,在Crimmins条件下的不对称醛醇缩合,分子内S N 2置换和Mitsunobu酯化反应。
Effect of Water on Keck’s Catalytic Asymmetric Allylations of Aldehydes
作者:Michio Kurosu、Miguel Lorca
DOI:10.1055/s-2005-865202
日期:——
Ti(i-PrO) 4 , and unactivated or a large amount of activated 4 A MS in toluene is very effective in catalytic allylations of aldehydes using allyltributyltin. Allylations with 2.5 mol% of the catalyst provide homoallylic alcohols with greater than 95% ee. Very high syn-selective allylations of protected b-hydroxyaldehydes are achieved with 5 mol% of the BINOL/Ti(i-PrO) 4 complex.
由 BINOL、Ti(i-PrO) 4 和未活化或大量活化的 4 A MS 在甲苯中生成的络合物在使用烯丙基三丁基锡催化醛的烯丙基化中非常有效。使用 2.5 mol% 的催化剂进行烯丙基化可提供 ee 大于 95% 的高烯丙醇。使用 5 mol% 的 BINOL/Ti(i-PrO) 4 配合物可实现受保护的 b-羟基醛的非常高的顺式选择性烯丙基化。
Catalytic asymmetric synthesis promoted by a chiral zirconate: Highly enantioselective allylation of aldehydes
作者:Paolo Bedeschi、Sonia Casolan、Anna L. Costa、Emilio Tagliavini、Achille Umani-Ronchi
DOI:10.1016/0040-4039(95)01627-t
日期:1995.10
A new chiral Lewis acid catalyst, [BINOL-Zr(OiPr)2], is prepared from (R) or (S)-BINOL and commercially available Zr(OiPr)4·iPrOH; it efficently promotes the enantioselective allylation of aldehydes by allyltributyltin in shorter times and at lower temperatures with respect to related catalysts.
由(R)或(S)-BINOL和可商购的Zr(O i Pr)4 · i PrOH制备新的手性路易斯酸催化剂[BINOL-Zr(O i Pr)2 ] 。相对于相关的催化剂,它在较短的时间和较低的温度下有效地促进了烯丙基三丁基锡对醛的对映选择性烯丙基化。