Pseudoephedrine as a Practical Chiral Auxiliary for the Synthesis of Highly Enantiomerically Enriched Carboxylic Acids, Alcohols, Aldehydes, and Ketones
作者:Andrew G. Myers、Bryant H. Yang、Hou Chen、Lydia McKinstry、David J. Kopecky、James L. Gleason
DOI:10.1021/ja970402f
日期:1997.7.1
pseudoephedrine as a practical chiral auxiliary for asymmetricsynthesis is described in full. Both enantiomers of pseudoephedrine are inexpensive commodity chemicals and can be N-acylated in high yields to form tertiary amides. In the presence of lithium chloride, the enolates of the corresponding pseudoephedrine amides undergo highly diastereoselective alkylations with a wide range of alkyl halides to
Total Synthesis and Neuritotrophic Activity of Farinosone C and Derivatives
作者:Henning J. Jessen、Damien Barbaras、Matthias Hamburger、Karl Gademann
DOI:10.1021/ol901277q
日期:2009.8.6
An efficient synthesis of all four possible stereoisomers of the neurotrophic amide farinosone C was developed. The absolute and relative configuration was assigned by comparison of synthetic material with a derivatized authentic sample of the natural product. Several derivatives allowed for the generation of preliminary structure activity relationships concerning neurite outgrowth in PC-12 cells, unravelling L-tyrosinol-amide as the pharmacophore.
Stereoselective Syntheses of Epothilones A and B via Nitrile Oxide Cycloadditions and Related Studies
作者:Jeffrey W. Bode、Erick M. Carreira
DOI:10.1021/jo015791h
日期:2001.9.1
epothilones A and B are described. The routes described make extensive study of nitrileoxide cycloadditions as surrogates for aldoladdition reactions and have led to the realization of a highly convergent synthesis based on the Kanemasa hydroxyl-directed nitrileoxide cycloaddition. As well, our synthetic efforts have led to the development of new reaction methodologies and served as the proving ground for