July 18, 2024, 03:12:28 AM
Forum Rules: Read This Before Posting

Topic: Kumada Coupling - enantiomeric question  (Read 1316 times)

0 Members and 1 Guest are viewing this topic.

Offline Parathormon

  • Regular Member
  • ***
  • Posts: 12
  • Mole Snacks: +0/-0
Kumada Coupling - enantiomeric question
« on: December 05, 2022, 01:03:30 PM »
Good Evening ,

I am working on some structure which contains bridged alkyl group (norbornane) - i need to attach phenyl group to one of the secondary carbons;

Molecule is quite complex and multi-step to build - its some novel PDE5 inhibitor, thats why better to use excess of phenyl-substrate;

After some consideration We are about to choose Negishi coupling or Kumada with excess of respectively phenylzinc iodide or phenylmagnesium iodide;

Convert our alkyl to iodide first and then couple with one of above methods;

The Problem is here how does theese coupling „work” in case of our alkyl halide is exo isomer which is our goal isomer - does theese methods do retention, inversion or racemize this configuration?

there is also possible to use chiral catalyst to enrich the product with desired isomer i guess but the most optimal would be to keep retention somehow because our substrate is actually chiral.

Sponsored Links