Enantioselective approach to butenolides upon reduction of alkoxycarbene complexes of chromium with chiral dihydropyridines
摘要:
Chromium alkoxycarbene complexes tethered to a triple bond react with a series of chiral dihydropyridines, among which is N-methyl-1,2-dihydronicotine, to give enantioselectively, upon cascade insertion reactions, polycyclic butenolides. (C) 2001 Elsevier Science Ltd. Air rights reserved.
Chromium alkoxycarbene complexes tethered to a triple bond react with a series of chiral dihydropyridines, among which is N-methyl-1,2-dihydronicotine, to give enantioselectively, upon cascade insertion reactions, polycyclic butenolides. (C) 2001 Elsevier Science Ltd. Air rights reserved.
Tungsten(0) alkylidene complexes stabilized as pyridinium ylides: new aspects of their synthesis and reactivity
作者:Henri Rudler、Thomas Durand-Réville
DOI:10.1016/s0022-328x(00)00727-0
日期:2001.1
The interaction of dihydropyridines with alkoxycarbene complexes of tungsten has been shown to lead to pyridinium ylid complexes: this transformation has now been applied to the synthesis of a hydroxyl-containing ylid complex by ring-opening of the pentacarbonyl (2-oxacyclopentylidene) tungsten(0) complex and to the synthesis of a series of chiral ylid complexes both from chiral and non-chiral carbene