3 research outputs found
Scalable Synthesis of Enantiomerically Pure Bicyclo[2.2.2]octadiene Ligands
An operationally simple and scalable synthesis of enantiomerically
pure bicyclo[2.2.2]Âoctadiene (bod*) ligands relying on an organocatalytic
one-pot Michael addition–aldol reaction with cheap 2-cyclohexenone
and phenylacetaldehyde is presented. The crystalline bicyclic product <b>4a</b> (6-hydroxy-5-phenylbicyclo[2.2.2]Âoctan-2-one) is transformed
into phenylbicyclo[2.2.2]Âoct-5-en-2-one <b>2</b>, a versatile
starting material for the 2-step synthesis of both symmetrical, such
as Hayashi’s Ph-bod* ligand, as well as novel unsymmetrical
chiral dienes
Scalable Synthesis of Enantiomerically Pure Bicyclo[2.2.2]octadiene Ligands
An operationally simple and scalable synthesis of enantiomerically
pure bicyclo[2.2.2]Âoctadiene (bod*) ligands relying on an organocatalytic
one-pot Michael addition–aldol reaction with cheap 2-cyclohexenone
and phenylacetaldehyde is presented. The crystalline bicyclic product <b>4a</b> (6-hydroxy-5-phenylbicyclo[2.2.2]Âoctan-2-one) is transformed
into phenylbicyclo[2.2.2]Âoct-5-en-2-one <b>2</b>, a versatile
starting material for the 2-step synthesis of both symmetrical, such
as Hayashi’s Ph-bod* ligand, as well as novel unsymmetrical
chiral dienes
Practical Synthesis of MDM2 Antagonist RG7388. Part 2: Development of the Cu(I) Catalyzed [3 + 2] Asymmetric Cycloaddition Process for the Manufacture of Idasanutlin
A concise catalytic
asymmetric synthesis of idasanutlin (<b>1</b>) was developed
in which the key pyrrolidine core, containing
four contiguous stereocenters, was constructed via a Ag/MeOBIPHEP
promoted [3 + 2] cycloaddition reaction. Further development of the
[3 + 2] cycloaddition reaction resulted in an improvement in diastereoselectivity
and enantioselectivity by changing the catalyst system to CuÂ(I)/BINAP.
While producing equivalent high quality API, the copperÂ(I) catalyzed
process not only increased the overall yield but also demonstrated
benefit with respect to cycle times, waste streams, and processability.
The optimized copperÂ(I) catalyzed process has been used to prepare
more than 1500 kg of idasanutlin (<b>1</b>)