Low-Energy Pathway for Pauson−Khand Reactions: Synthesis and Reactivity of Dicobalt Hexacarbonyl Complexes of Chiral Ynamines
作者:Jaume Balsells、Jordi Vázquez、Albert Moyano、Miquel A. Pericàs、Antoni Riera
DOI:10.1021/jo000278+
日期:2000.11.1
unstable terminal ynamine complexes 12a-f. The Pauson-Khandreaction of 12a-f with strained olefins (norbornadiene and norbornene) takes place at unprecedentedly low temperatures (-35 degrees C) in the absence of chemical promoters. Diastereoselectivities of up to 94:6 are recorded in these reactions with the ynamine complexes derivedfrom C(2) symmetrical chiral auxiliaries (12c,d). The high reactivity