Stereoselective Synthesis of (+)-Nephrosteranic Acid, (+)-trans-Cognac Lactone, and (+)-trans-Whisky Lactone using a Chiral Cyclohexadienyl Ti Compound
3-dioxolandimethanol) cyclohexadienyl Ti derivative with various aldehydes led to the corresponding homoallylicalcohols with excellent diastereo- and enantioselectivities. Lower selectivities were obtained with chiral B-cyclohexadienyldiisopinocampheylborane. The 1,3-cyclohexadienes are very useful building blocks for the preparation of biologically important gamma-butyrolactones. Short efficient syntheses of (+)-nephrosteranic
Aldol Reactions of Dioxanes Derived from Tartaric Acid. A Total Synthesis of (+)-Nephrosteranic Acid
作者:M. Teresa Barros、Christopher D. Maycock、M. Rita Ventura
DOI:10.1021/ol0354932
日期:2003.10.1
[reaction: see text]. A general enantioselective synthesis of the paraconic acids was developed. The key step was a highly stereoselective aldol reaction between a dioxane dithioester derivedfrom l-tartaric acid and a suitable aldehyde.
A short, efficient and novel approach for multifunctionalized γ-butyrolactone paraconic acids and its application to the total synthesis of (+)-nephrosteranic acid from readily available PMB (R)-glycidyl ether as a starting material are described. Key transformations include asymmetric Michael addition catalyzed by chiral diphenylprolinol silyl ether and stereoselective α-methylation.
描述了一种用于多功能化 γ-丁内酯仲康酸的简短、有效和新颖的方法及其在以容易获得的 PMB ( R )-缩水甘油醚为起始材料全合成 (+)-nephrosteranic 酸中的应用。关键转化包括由手性二苯基脯氨醇甲硅烷基醚催化的不对称迈克尔加成和立体选择性 α-甲基化。
A protecting-group-free synthesis of (+)-nephrosteranic, (+)-protolichesterinic, (+)-nephrosterinic, (+)-phaseolinic, (+)-rocellaric acids and (+)-methylenolactocin
作者:Jothi L. Nallasivam、Rodney A. Fernandes
DOI:10.1039/c6ob02398c
日期:——
A collective synthesis of a γ-butyrolactone class of paraconic acids such as (+)-methylenolactocin, (+)-phaseolinic acid, (+)-nephrosteranic acid, (+)-nephrosterinic acid, (+)-rocellaric acid and (+)-protolichesterinic acid is described. The strategy adopted is protecting-group-free based on efficient Pd-catalyzed Suzuki–Miyaura coupling and Ru-catalyzed Sharpless oxidation to construct the core β
Diastereoselective synthesis of (+)-nephrosterinic acid and (+)-protolichesterinic acid
作者:Rodney A. Fernandes、Mahesh B. Halle、Asim K. Chowdhury、Arun B. Ingle
DOI:10.1016/j.tetasy.2011.12.012
日期:2012.1
A diastereoselective synthesis of (+)-nephrosterinic acid and (+)-protolichesterinic acid, common members of the paraconic acids is described. The synthesis is based on a diastereoselective orthoester Johnson-Claisen rearrangement of a (Z)-allyl alcohol with a vicinal dioxolane moiety as key steps. The synthesis is completed in 10 steps and with overall yields of 15.9% for (+)-nephrosterinic acid and 16.4% for (+)-protolichesterinic acid. (C) 2012 Elsevier Ltd. All rights reserved.