Synthesis of enantiopure C1 symmetric diphosphines and phosphino-phosphonites with ortho-phenylene backbones
摘要:
Reaction of 2-(diphenylphosphino)phenylphosphonous acid tetramethyldiamide 1 with (+)-menthol, (1S,2S,3S,5R)-isopinocampheol and (1R,2R)-trans-cyclohexanediol affords enantiopure phosphino-phosphonite ligands 3-5. The X-ray structures of 1 (space group P2(1)/n) and 3 (space group P2(f)) have been determined. The reaction of 1 with (1R,2R,3S,5R)-(-)-pinanediol proceeds diastereoselectivity to afford a novel type of enantiopure phosphino-phosphonite ligand 6 with an asymmetric substituted P atom. On reaction of (+)-cedryl alcohol with 1 the adduct 7 of the phosphonous acid 2-Ph2P-C6H4P(-O)(H)OH 9 and its dimethylammonium salt is formed through elimination of water and subsequent hydrolysis. The structure of 7 (space group P (1) over bar) was elucidated by X-ray structural analysis. Reduction of the chlorophosphine 8 with LiAlH4 yields the novel primary-tertiary phosphine 10, which is a valuable starting material for the synthesis of the enantiopure C-1 symmetric bidentate phospholane ligands 11 and 12. (C) 2001 Elsevier Science Ltd, All rights reserved.
Synthesis of enantiopure C1 symmetric diphosphines and phosphino-phosphonites with ortho-phenylene backbones
摘要:
Reaction of 2-(diphenylphosphino)phenylphosphonous acid tetramethyldiamide 1 with (+)-menthol, (1S,2S,3S,5R)-isopinocampheol and (1R,2R)-trans-cyclohexanediol affords enantiopure phosphino-phosphonite ligands 3-5. The X-ray structures of 1 (space group P2(1)/n) and 3 (space group P2(f)) have been determined. The reaction of 1 with (1R,2R,3S,5R)-(-)-pinanediol proceeds diastereoselectivity to afford a novel type of enantiopure phosphino-phosphonite ligand 6 with an asymmetric substituted P atom. On reaction of (+)-cedryl alcohol with 1 the adduct 7 of the phosphonous acid 2-Ph2P-C6H4P(-O)(H)OH 9 and its dimethylammonium salt is formed through elimination of water and subsequent hydrolysis. The structure of 7 (space group P (1) over bar) was elucidated by X-ray structural analysis. Reduction of the chlorophosphine 8 with LiAlH4 yields the novel primary-tertiary phosphine 10, which is a valuable starting material for the synthesis of the enantiopure C-1 symmetric bidentate phospholane ligands 11 and 12. (C) 2001 Elsevier Science Ltd, All rights reserved.
Synthesis of enantiopure C1 symmetric diphosphines and phosphino-phosphonites with ortho-phenylene backbones
作者:Konstantin W. Kottsieper、Uwe Kühner、Othmar Stelzer
DOI:10.1016/s0957-4166(01)00175-6
日期:2001.5
Reaction of 2-(diphenylphosphino)phenylphosphonous acid tetramethyldiamide 1 with (+)-menthol, (1S,2S,3S,5R)-isopinocampheol and (1R,2R)-trans-cyclohexanediol affords enantiopure phosphino-phosphonite ligands 3-5. The X-ray structures of 1 (space group P2(1)/n) and 3 (space group P2(f)) have been determined. The reaction of 1 with (1R,2R,3S,5R)-(-)-pinanediol proceeds diastereoselectivity to afford a novel type of enantiopure phosphino-phosphonite ligand 6 with an asymmetric substituted P atom. On reaction of (+)-cedryl alcohol with 1 the adduct 7 of the phosphonous acid 2-Ph2P-C6H4P(-O)(H)OH 9 and its dimethylammonium salt is formed through elimination of water and subsequent hydrolysis. The structure of 7 (space group P (1) over bar) was elucidated by X-ray structural analysis. Reduction of the chlorophosphine 8 with LiAlH4 yields the novel primary-tertiary phosphine 10, which is a valuable starting material for the synthesis of the enantiopure C-1 symmetric bidentate phospholane ligands 11 and 12. (C) 2001 Elsevier Science Ltd, All rights reserved.