301191-47-9Relevant articles and documents
Stereoinversion of Unactivated Alcohols by Tethered Sulfonamides
Marcyk, Paul T.,Jefferies, Latisha R.,AbuSalim, Deyaa I.,Pink, Maren,Baik, Mu-Hyun,Cook, Silas P.
, p. 1727 - 1731 (2019/01/21)
The direct, catalytic substitution of unactivated alcohols remains an undeveloped area of organic synthesis. Moreover, catalytic activation of this difficult electrophile with predictable stereo-outcomes presents an even more formidable challenge. Described herein is a simple iron-based catalyst system which provides the mild, direct conversion of secondary and tertiary alcohols to sulfonamides. Starting from enantioenriched alcohols, the intramolecular variant proceeds with stereoinversion to produce enantioenriched 2- and 2,2-subsituted pyrrolidines and indolines, without prior derivatization of the alcohol or solvolytic conditions.
Aminophosphine phosphinites derived from chiral 1,2-diphenyl-2-aminoethanols: Synthesis and application in rhodium-catalyzed asymmetric hydrogenation of dehydroamino acid derivatives
Lou, Rongliang,Mi, Aiqiao,Jiang, Yaozhong,Qin, Yong,Li, Zhi,Fu, Fangmin,Chan, Albert S.C
, p. 5857 - 5863 (2007/10/03)
A series of chiral aminophosphine phosphinites DPAMPPs was synthesized from optically active 1,2-diphenyl-2-aminoethanols. The erythro-DPAMPPs were found to serve as excellent ligands for rhodium-catalyzed asymmetric hydrogenation of dehydroamino acid derivatives. For an array of dehydroamino acid precursors, remarkably high enantioselectivity (up to 98.4% e.e.) and reactivity (the ratio of substrate/catalyst up to 10000) were observed. Some factors controlling the enantioselectivity were examined and discussed. (C) 2000 Elsevier Science Ltd.