新型轴向手性联苯二膦配体E n m -BridgePhos,在联苯主链的5,5′-位上带有醚链桥,已被开发并成功应用于Rh催化的α-acetamido-1的对映选择性不对称氢化反应,3-茚满二酮,以高产率(高达 97%)提供手性 α-乙酰氨基-β-羟基苯并环戊酮,并具有优异的对映选择性(高达 99% ee)。该反应可以在克级规模上进行,相应的产物可作为合成手性螺苄基异喹啉生物碱类似物的重要中间体。晶体结构分析和DFT计算均表明E nm -BridgePhos-Rh配合物的大二面角与优异的对映选择性密切相关。
A NEW METHOD FOR THE REGIO- AND STEREOSELECTIVE SYNTHESIS OF ALDOLS FROM α-BROMOKETONE AND CARBONYL COMPOUNDS BY USING METALLIC TIN
作者:Taira Harada、Teruaki Mukaiyama
DOI:10.1246/cl.1982.467
日期:1982.4.5
Tin(II) enolates, generated in situ by the oxidative addition of α-bromoketones to metallic tin, react with a variety of carbonyl compounds under mild conditions to give the corresponding aldols in good yields. In the case of reactions of the enolate resulted from α-substituted α-bromoketone with aldehydes, remarkably high erythro-selectivities are attained.
锡 (II) 烯醇化物通过 α-溴酮与金属锡的氧化加成原位生成,在温和条件下与各种羰基化合物反应,以良好的收率得到相应的醛醇。在由 α-取代的 α-溴酮与醛产生的烯醇反应的情况下,获得了非常高的赤型选择性。
Rh-Catalyzed Enantioselective Desymmetric Hydrogenation of α-Acetamido-1,3-indanediones Using Ether-Bridged Biphenyl Diphosphine Ligands
Novel axiallychiralbiphenyl diphosphine ligands Enm-BridgePhos, bearing an ether chain bridge at the 5,5′-position of the biphenyl backbone, have been developed and successfully applied in the Rh-catalyzed enantioselective desymmetric hydrogenation of α-acetamido-1,3-indanediones, providing chiral α-acetamido-β-hydroxybenzocyclic pentones in high yields (up to 97%) and with excellent enantioselectivities
新型轴向手性联苯二膦配体E n m -BridgePhos,在联苯主链的5,5′-位上带有醚链桥,已被开发并成功应用于Rh催化的α-acetamido-1的对映选择性不对称氢化反应,3-茚满二酮,以高产率(高达 97%)提供手性 α-乙酰氨基-β-羟基苯并环戊酮,并具有优异的对映选择性(高达 99% ee)。该反应可以在克级规模上进行,相应的产物可作为合成手性螺苄基异喹啉生物碱类似物的重要中间体。晶体结构分析和DFT计算均表明E nm -BridgePhos-Rh配合物的大二面角与优异的对映选择性密切相关。