Mechanistically Guided One Pot Synthesis of Phosphine‐Phosphite and Its Implication in Asymmetric Hydrogenation
作者:Anirban Sen、Rohit Kumar、Swechchha Pandey、K. Vipin Raj、Pawan Kumar、Kumar Vanka、Samir H. Chikkali
DOI:10.1002/ejoc.202101447
日期:2022.1.17
Synthesis of hybrid phosphorus ligands is a multistep, time-consuming exercise. This limitation has been addressed by meticulous understanding of the process of formation of hybrid ligands and a onepotsynthesis of a phosphine-phosphite ligand (L1) is reported for the first time. L1 coordinates to Rh and catalyzes asymmetric hydrogenation of 15 substrates with a high TOF of 2289 and enantiomeric excess
Natural products. Antitubulin effect of congeners of <i>N</i>-acetylcolchinyl methyl ether: synthesis of optically active 5-acetamidodeaminocolchinyl methyl ether and of demethoxy analogues of deaminocolchinyl methyl ether
作者:O. Boyé、A. Brossi、H. J. C. Yeh、E. Hamel、B. Wegrzynski、V. Toome
DOI:10.1139/v92-160
日期:1992.5.1
were synthesized by four different routes: (1) Synthesis of 4 was achieved from 2,3-dimethoxybenzaldehyde via biphenyl aldehyde 17, chain lengthening to propionicacid 20, acid-catalyzed cyclization toward ketone 21, and removal of the carbonyl group. (2) Compound 5 was obtained by eliminating the sterically most hindered methoxy group in 25 or 26 by metal reduction in alcohol. (3) Compound 6 was prepared