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Questions And Answer

• Reaction

  1. Biaryl bisphosphine ligand with narrow dihedral angle. The SEGPHOS® ligand has been applied to a variety of metal catalyzed reactions. In many cases, yields and enantioselectivities, exceed results obtained earlier using BINAP.
  2. As ruthenium complex, SEGPHOS® generally gives higher levels of chiral induction in asymmetric hydrogenations of α,β,and γ-functionalized ketones. See ruthenium complexes 44-0096, 44-0518, 44-0168.
  3. Used in Rh-catalyzed transformations such as: (a) 1,4-addition of boronic acids to coumarins,4 (b) addition of titanium reagents to imines, (c) cotrimerization of alkenes and acetylenes, (d) double [2+2+2] cycloaddition,11 (e) indanone formation.12a,b
  4. Used in Pd-catalyzed transformations such as: (a) cycloaddition of 1,6-enyne, (b) arylative cyclization of allenyl aldehydes with boronic acids,13 (c) synthesis of chromans.
  5. Used in Cu-catalyzed transformations such as: (a) nitroso Diels-Alder, (b) reductive aldol condensation, (c) conjugate reduction of unsaturated sulfones,15 and phophonates.
  6. Iridium-catalyzed asymmetric hydrogenation of quinolines activated by chloroformates. 
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