Asymmetric Reactions Catalyzed by Chiral Metal Complexes. XLV. Efficient Preparation of Optically Active (S)-(-)-3-Methyl-.GAMMA.-butyrolactone by Catalytic Asymmetric Hydrogenation Using Chiral N-Substituted Pyrrolidinebisphosphine Rhodium Complexes.
作者:Hideo TAKEDA、Takeshi TACHINAMI、Shigeki HOSOKAWA、Masakazu ABURATANI、Kiyoshi INOGUCHI、Kazuo ACHIWA
DOI:10.1248/cpb.39.2706
日期:——
(S)-(-)-2-Methyl succinamic acid, which is a good precursor of (S)-(-)-3-methyl-γ-butyrolactone, can be prepared by homogeneous asymmetric hydrogenation of 2-methylene succinamic acid catalyzed by (2S, 4S)-N-substituted-4-(diphenylphosphino)-2-[(diphenylphosphino)-methyl]pyrrolidine-rhodium complexes. Various N-substituted pyrrolidine-bisphosphines were synthesized to find the optimum ligand for this purpose and to compare the effects of the N-substituents.
(S)-(-)-2-甲基琥珀酰胺酸是一种良好的(S)-(-)-3-甲基-γ-丁内酯的前体,可通过(2S, 4S)-N-取代的-4-(二苯膦基)-2-[(二苯膦基)甲基]吡咯烷-铑配合物催化的2-亚甲基琥珀酰胺酸的均相不对称氢化制备。合成了多种N-取代的吡咯烷双膦配体,以寻找最佳配体并比较N-取代基的影响。