A highly regio- and diastereoselective method to access cis-2,6-disubstituted dihydropyridinones under mild conditions by an iridium-catalyzedallylicetherification is reported. cis-2,6-Disubstituted dihydropyridinones are important precursors for the de novo synthesis of the corresponding piperidine alkaloids and iminosugars. This strategy features a broad substrate scope, high yields, and excellent
Tertiary Amine-Triggered Cascade S<sub>N</sub>2/Cycloaddition: An Efficient Construction of Complex Azaheterocycles under Mild Conditions
作者:Jian Hu、Bing Tian、Xinyan Wu、Xiaofeng Tong
DOI:10.1021/ol302329b
日期:2012.10.5
In this paper, an amine-triggeredcascade SN2/cycloaddtion sequence between 2-(acetoxymethyl)buta-2,3-dienoate 1 and various π-system functionalized tosylamides 3 has been reported, which provides a facile method for stereoselective construction of structurally diverse azaheterocycles.
在本文中,已经报道了在2-(乙酰氧基甲基)丁2,3-二烯酸酯1和各种π-系统官能化的甲苯磺酰胺3之间的胺触发级联S N 2 /环加成序列,为立体选择性构建Sn 2提供了一种简便的方法。结构上不同的氮杂杂环。
Gold Catalysis: Switching the Pathway of the Furan-Yne Cyclization
作者:A. Stephen K. Hashmi、Matthias Rudolph、Jürgen Huck、Wolfgang Frey、Jan W. Bats、Melissa Hamzić
DOI:10.1002/anie.200900887
日期:2009.7.27
Changing tracks: By the use of alkynyl ethers as directing elements, the furan‐yne cyclization enters a new reaction pathway. Instead of phenols, tetracycles containingtwoheteroatoms and two new stereocenters are formed (see scheme).
An efficient preparation of optically active α-furfuryl amide by kinetic resolution using the modified sharpless asymmetric epoxidation reagents
作者:Wei-Shan Zhou、Zhi-Hui Lu、Zhi-Min Wang
DOI:10.1016/s0040-4020(01)86343-2
日期:1993.3
Kineticresolution of α-furfuryl amide was first carried out by using the modified Sharpless asymmetric epoxidation reagent to give the slow-reacting enantiomers, (S)-1a–h and (R)-1b,f in high enantioselectivity(90–100% e.e) and high chemical yield (45–50%). Similar results were obtained from the fast-reacting enantiomers. This kineticresolution exhibits the reversed enantioselectivity.
An efficient preparation of optically active α-furfuryl amide by kinetic resolution using the modified sharpless asymmetric epoxidation reagent
作者:Wei-Shan Zhou、Zhi-Hui Lu、Zhi-Min Wang
DOI:10.1016/0040-4039(91)80360-i
日期:1991.3
Kineticresolution of α-furfuryl amide was first carried out by using the modified Sharpless asymmetric epoxidation reagent to give the slow-reacting enantiomers, (S)-1a–f and (R)-1b,f in high enantioselectivity (90–100% e.e) and high chemical yield (45–50%).