Scope and Utility of a New Soluble Copper Catalyst [CuBr−LiSPh−LiBr−THF]: A Comparison with Other Copper Catalysts in Their Ability to Couple One Equivalent of a Grignard Reagent with an Alkyl Sulfonate
作者:Dennis H. Burns、Jeffrey D. Miller、Ho-Kit Chan、Michael O. Delaney
DOI:10.1021/ja963944q
日期:1997.3.1
THF at 0 °C furnished a new soluble copper catalyst that was highly efficient at coupling primary, secondary, tertiary, aryl, vinyl, and allylic Grignard reagents to primary tosylates and primary Grignard reagents to secondary tosylates and mesylates, all with the use of only 1 equiv of Grignard reagent. The new catalyst was shown to be much more reactive than copper catalysts CuBr and Li2CuCl4 and more
CuI-catalyzed coupling reaction of R(alkyl)-X with Ar(aryl)MgBr at rt was completed within 2 h. Effective leaving groups X in R-X were Br, I, OTs, but not Cl. Grignard reagents ArMgBr with both standard and bulky Ar such as 2-MeC6H4, 2-MeOC6H4, and 2,6-(Me)2C6H3 afforded the desired products in good yields. Ester and cyano groups in R-X were tolerated. Coupling reaction with R(alkyl)-MgBr proceeded as
在LiCl的存在下,在室温下2小时内完成CuI催化的R(烷基)-X与Ar(芳基)MgBr的偶联反应。RX中有效的离去基团X是Br,I,OT,但不是Cl。带有标准Ar和大块Ar的格氏试剂ArMgBr(例如2-MeC 6 H 4,2 -MeOC 6 H 4和2,6-(Me)2 C 6 H 3)以良好的收率提供了所需的产物。RX中的酯基和氰基基团是可容忍的。与R(烷基)-MgBr的偶联反应也进行。
Anti-inflammatory furanones
申请人:Allergan, Inc.
公开号:US05134128A1
公开(公告)日:1992-07-28
New 5-hydroxy-2-furanone compounds having anti-inflammatory, immunosuppressive and anti-proliferative activity and are useful in treating psoriasis and modifying calcium homeostasis.