Titanium-Mediated Fragment Union Processes in Complex Molecule Synthesis: Development of a Branched Reaction Pathway of High Step Economy for the Synthesis of Complex and Diverse Polyketides
Asymmetrichydroformylation of conjugated dienes has been investigated using (R,S)-BINAPHOS-Rh(I) complex as a catalyst [(R,S)-BINAPHOS = (R)-2-(diphenylphosphino)-1,1′-binaphthalen-2′-yl(S)-1,1′-binaphthalene-2,2′-diyl phosphite]. Optically active β,γ-unsaturated aldehydes were obtained in high regio- (78–94%) and enantioselectivities (80–97% ee) from 1-vinylcyclohexene, 4-methyl-1,3-pentadiene, and
Acyclic stereoselection. 16. High diastereofacial selectivity in Lewis acid mediated additions of enol silanes to chiral aldehydes
作者:Clayton H. Heathcock、Lee A. Flippin
DOI:10.1021/ja00344a050
日期:1983.3
Asymmetric hydroformylation of conjugated dienes catalysed by [(R)-2-diphenylphosphino-1,1′-dinaphthalen-2′-yl][(S)-1,1′-dinaphthalene-2,2′-diyl]phosphite–rhodium(<scp>I</scp>)
Asymmetric hydroformylation of conjugated dienes such as vinylcyclohexene, (E)-phenyl-buta-1,3-diene and 4-methyl-penta-1,3-diene using BINAPHOS-Rh-I complexes as catalysts (R,S)-BINAPHOS = [(R)-2-diphenylphosphino-1,1'-dinaphthalen-2'-yl] [(S)-1,1'-dinaphthalene-2,2'-diyl]-phosphite} gives optically active beta,gamma-unsaturated aldehydes in high regio- (81-91%) and enantio-selectivities (84-97% ee).
Asymmetric synthesis of premonensin, a potential intermediate in the biosynthesis of monensin