Scope of the nickel catalyzed asymmetric reductive ring opening reaction. Synthesis of enantiomerically enriched cyclohexenols
作者:Mark Lautens、Tomislav Rovis
DOI:10.1016/s0040-4020(97)10211-3
日期:1998.2
Subjecting a variety of oxabicyclo[2.2.1]heptenes to diisobutylaluminum hydride (DIBAL-H) in the presence of a catalytic amount of Ni(COD)2 and (R)-BINAP results in a highly enantioselective ring opening to generate cyclohexenols with ee's typically greater than 90%. The scope of this reaction has been delineated and alternative nickel catalysts have been examined which are less sensitive than Ni(COD)2
Preparation of cyclohexenyl derivatives by the ring-opening reactions of oxabicyclo[2.2.1] compounds with cuprates
作者:Mark Lautens、A. Catherine Smith、Alaa S. Abd-El-Aziz、Alexandre H. Huboux
DOI:10.1016/s0040-4039(00)89036-x
日期:1990.1
The ring-opening reaction of 7-oxabicyclo[2.2.1]hept-5-enes with cuprates is described. SN2′ attack with retention of configuration is the predominant pathway.