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
Brine-Stabilized 2,2,2-Trifluorodiazoethane and Its Application in the Synthesis of CF<sub>3</sub>–Substituted Cyclopropane α-Amino Acids
作者:Chuan-Le Zhu、Li-Jun Yang、Shen Li、Yan Zheng、Jun-An Ma
DOI:10.1021/acs.orglett.5b01450
日期:2015.7.17
CF3CHN2 in CH3CN is realized. This method shows excellent generality, affording a wide range of trifluoromethyl-substituted cyclopropanes bearing azlactone rings in good to high yields and diastereoselectivities. With the products in hand, the trifluoromethyl-substituted cyclopropane α-amino acids and relative peptide derivatives could be readily obtained.