Highly Enantioselective Ruthenium-Catalyzed Reduction of Ketones Employing Readily Available Peptide Ligands
作者:Anders Bøgevig、Isidro M. Pastor、Hans Adolfsson
DOI:10.1002/chem.200305553
日期:2004.1.5
Highly efficient and selective catalysts for the asymmetric reduction of aryl alkyl ketones under hydrogen-transfer conditions (2-propanol) were obtained by combining a novel class of pseudo-dipeptide ligands with [[RuCl(2)(p-cymene)](2)]. A library of 36 dipeptide-like ligands was prepared from N-Boc-protected alpha-amino acids and the enantiomers of 2-amino-1-phenylethanol and 1-amino-2-propanol
通过将新型伪二肽配体与[[RuCl(2)(p-cymene)](2 )]。由N-Boc保护的α-氨基酸和2-氨基-1-苯基乙醇和1-氨基-2-丙醇的对映异构体制备了36种二肽样配体的文库。用苯乙酮的还原来评估催化剂库,并且用几种新型催化剂获得了1-苯基乙醇的优异对映选择性。发现基于N-Boc-L-丙氨酸和(S)-1-氨基-2-丙醇(配体A-(S)-4)的组合的配体特别有效。当该配体的原位形成的钌络合物用作各种芳基烷基酮的氢转移反应的催化剂时,