The chelating P,S-heterodonor ligand 2-diphenylphosphanyl-1,1'-binaphthalene-2'-thiol (11) (BINAPS), which features a chiral axis as the unique stereogenic element, has been prepared in both racemic and enantiopure form through a multistep reaction sequence using 2,2'-dihydroxy-1,1'-binaphthalene (BINOL) as the starting material. The reaction sequence is completely stereoconservative and (S)-11 is obtained with no loss of enantiopurity from pure (S)-BINOL. (R)-11 can be alternatively obtained by resolution of racemic 11 using the chiral (S)-benzylaminato Pd(II)-complex 19 as the resolving agent. The S-methyl or the S-i-propyl derivatives 14 have been used as chiral ligands in the Rh(I)-catalyzed asymmetric hydroformylation of styrene and in the hydrogen transfer reduction of acetophenone with modest success (up to 20% ee). In the presence of suitable Pd-complexes the same ligands provide higher ees in the hydrosilylation of styrene (50% ee) and in the allylic alkylation of 1,3-diphenylprop-2-enyl acetate (60% ee).Key words: heterodonor ligands, binaphthalene derivatives, enantioselective catalysis, transition metal catalysts, allylic alkylation.
含有螯合P、S-杂原子供体的配体2-二苯基膦基-1,1'-联萘-2'-硫醇(BINAPS)具有手性轴作为独特的立体发生元素,通过多步反应序列使用2,2'-二羟基-1,1'-联萘(BINOL)作为起始物质制备了其既对映的又无对映纯的形式。该反应序列完全保持立体构型,纯(S)-BINOL制备的(S)-11不会失去对映纯度。通过使用手性(S)-苄胺基Pd(II)-配合物19作为分离剂,可以通过分离法获得(R)-11。S-甲基或S-异丙基衍生物14已被用作手性配体,在Rh(I)催化的苯乙烯不对称氢甲酰化和乙酰苯酮的氢转移还原反应中取得了适度的成功(最高20% ee)。在适当的Pd-配合物存在下,相同的配体在苯乙烯的氢硅烷化(50% ee)和1,3-二苯基丙-2-烯基醋酸酯的烯基烷基化(60% ee)中提供更高的ee。关键词:杂原子供体配体、联萘衍生物、对映选择性催化、过渡金属催化剂、烯基烷基化。