Enantioselective Copper-Catalyzed 1,4-Addition ofGrignard Reagents to ?,?-Unsaturated Carbonyl Compounds
作者:Maurus Spescha、Grety Rihs
DOI:10.1002/hlca.19930760309
日期:1993.5.12
several reaction conditions. The chemical yields and regioselectivities for this reaction were, in all cases, larger than 90 and 98%, respectively, and independent of the experimental conditions. The enantioselectivity was strongly dependent on the reaction conditions and reached a maximum of 60%. Several other substrates were also tested in the above reaction. The X-ray crystal structure for [Cu(siig)(pp)]
用以下Cu I化合物作为催化剂前体和1,2:5,6-di- O研究了对映选择性铜催化的格氏试剂向α,β-不饱和羰基化合物的1,4-加成反应-异亚丙基-3-硫代-α-D-呋喃葡萄糖(Hsiig)作为手性配体:CuI,碘代[双(二丁基硫醚)]铜(I),[Cu(siig)],[Cu(siig)(pp)]( pp = 1,2-双)(二苯基膦基乙烯)和四[碘(三丁基膦)]铜(I)。在几个反应条件下测试了将BuMg卤化物添加到cyclohex-2-en-1-one中。在所有情况下,该反应的化学产率和区域选择性分别大于90%和98%,并且与实验条件无关。对映选择性在很大程度上取决于反应条件,最高达到60%。在上述反应中还测试了其他几种底物。[Cu(siig)(pp)]的X射线晶体结构通过X射线晶体学确定。