中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 2-(diphenylphosphanyl)-1,1'-binaphthyl-2'-thiol | 374687-43-1 | C32H23PS | 470.574 |
—— | (R)-(+)-2-(diphenylphosphinyl)-2'-methylsulfanyl-1,1'-binaphthalenyl | —— | C33H25OPS | 500.601 |
—— | (R)-(+)-2-(diphenylphosphinyl)-1,1'-binaphthyl-2'-thiol | —— | C32H23OPS | 486.574 |
—— | (R)-(+)-2-(diphenylphosphinyl)-1,1'-binaphthyl-2'-thiol-N,N-dimethylthiocarbamate | —— | C35H28NO2PS | 557.653 |
—— | ((R)-2'-hydroxy-[1,1'-binaphthalen]-2-yl)diphenylphosphine oxide | 162426-75-7 | C32H23O2P | 470.507 |
—— | (R)-(+)-2-(diphenylphosphinyl)-2'-[(trifluoromethanesulfonyl)oxy]-1,1'-binaphthyl | —— | C33H22F3O4PS | 602.57 |
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.