The kinetic resolution of allylic alcohols by a non-enzymatic acylation catalyst; application to natural product synthesis
作者:Stéphane Bellemin-Laponnaz、Jennifer Tweddell、J. Craig Ruble、Frank M. Breitling、Gregory C. Fu
DOI:10.1039/b002041i
日期:——
A planar-chiral DMAP derivative is shown to serve as an effective catalyst for the kinetic resolution of allylic alcohols; to illustrate its practical utility, the catalyst is applied to the resolution of two alcohols that have been employed as intermediates in recent naturalproduct total syntheses.
Kinetic resolution of racemic allylic alcohols <i>via</i> iridium-catalyzed asymmetric hydrogenation: scope, synthetic applications and insight into the origin of selectivity
作者:Haibo Wu、Cristiana Margarita、Jira Jongcharoenkamol、Mark D. Nolan、Thishana Singh、Pher G. Andersson
DOI:10.1039/d0sc05276k
日期:——
Asymmetric hydrogenation is one of the most commonly used tools in organic synthesis, whereas, kineticresolution via asymmetric hydrogenation is less developed. Herein, we describe the first iridium catalyzed kineticresolution of a wide range of trisubstituted secondary and tertiary allylic alcohols. Large selectivity factors were observed in most cases (s up to 211), providing the unreacted starting
不对称氢化是有机合成中最常用的工具之一,而通过不对称氢化进行动力学拆分的开发较少。在此,我们描述了各种三取代仲和叔烯丙醇的第一次铱催化动力学拆分。在大多数情况下观察到较大的选择性因子(高达211),从而以良好的收率和高水平的对映体纯度(ee 高达 >99%)提供未反应的起始材料。该方法的实用性在一些生物活性天然产物的对映选择性正式合成中得到了强调,包括 pumiliotoxin A、inthomycin A 和 B。提出了 DFT 研究和关于选择性起源的选择性模型。
PARK, JEONGHAN;PEDERSEN, STEVEN F., J. ORG. CHEM., 55,(1990) N4, C. 5924-5926
作者:PARK, JEONGHAN、PEDERSEN, STEVEN F.
DOI:——
日期:——
Diastereoselective schenck ene reaction of singlet oxygen with chiral allylic alcohols; access to enantiomerically enriched 1,2,4-trioxanes
作者:Sunil Sabbani、Louise La Pensée、John Bacsa、Erik Hedenström、Paul M. O'Neill
DOI:10.1016/j.tet.2009.08.020
日期:2009.10
3-methyl-2-butenal catalysed by (+)-MIB or (−)-MIB yielded both the enantiomers of the chiral allylic alcohols 9–11 (90–98% ee), which were subjected to diastereoselectivephotooxygenation in the presence of tetraphenylporphine (TPP) to obtain (R,R)-threo- or (S,S)-threo-β-hydroperoxy alcohols (12–14). Reaction of β-hydroperoxy alcohols (12–14) with different cyclic ketones produced optically active trioxanes