Synthesis and Ruthenium-Catalyzed Enantioselective Hydrogenation of 3-O-Substituted 1,3-Dihydroxypropan-2-ones. Part 2
作者:Edoardo Cesarotti、Patrizia Antognazza、Marco Pallavicini、Luigi Villa
DOI:10.1002/hlca.19930760620
日期:1993.9.22
A number of 3-O-substituted 1,3-dihydroxypropan-2-ones have been synthesized in view of their potential use as prochiral precursors of optically active glycerols. Indeed, the oxo-ethers have been reduced to the corresponding 3-O-substituted glycerols via chiral Ru complexes derived from (S)-binap, ( =(−)-(S)-2,2′-bis(diphenylphosphino)-1,1′-binaphthalene) with enantiomeric excesses up to 93%. The steric
考虑到它们作为旋光性甘油的前手性前体的潜在用途,已经合成了许多3 - O-取代的1,3-二羟基丙烷-2-酮。实际上,氧代醚已被还原为相应的3- ø -取代的甘油通过衍生自手性Ru配合物(小号) - - ()-BINAP,(=(小号)-2,2'-二(二苯基膦基) - 1,1'-对苯二酚的对映体过量最高可达93%。催化还原的空间过程似乎主要取决于取代基的空间占位性。的确,当笨重的三苯甲基基团被较少保留的苄基或十八烷基基团取代时,观察到对映体过量的急剧增加。