Zhang, Wen published the artcilePalladium-catalyzed asymmetric allylic substitutions by axially chiral P,S-, S,S-, and S,O-heterodonor ligands with a binaphthalene framework, Application In Synthesis of 126613-06-7, the publication is Tetrahedron: Asymmetry (2004), 15(19), 3161-3169, database is CAplus.
Axially chiral P,S-heterodonor ligand I is effective in the asym. allylic substitution of 1,3-diphenylpropenyl acetate with di-Me malonate. Its bidentate coordination pattern to a Pd metal center with both P and S atoms has been unambiguously established by X-ray diffraction and NMR spectroscopic analyses. Herein, we further disclose that axially chiral S,S-heterodonor ligands II (R = Me2NC(S)O, MeS, and Ph2CHS) are also effective in the same reaction to give the allylic alkylation product in moderate to good ee. However, the corresponding S,O-heterodonor ligands are not as effective as the corresponding P,S- or S,S-heterodonor ligands in the same asym. reaction.
Tetrahedron: Asymmetry published new progress about 126613-06-7. 126613-06-7 belongs to esters-buliding-blocks, auxiliary class Chiral Diphenols, name is (R)-[1,1′-Binaphthalene]-2,2′-diyl bis(trifluoromethanesulfonate), and the molecular formula is C22H21N3O3S, Application In Synthesis of 126613-06-7.
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