Synthesis of clasto-lactacystin .beta.-lactone and analogs thereof

   
   

The present invention is directed to an improved synthesis of clasto-lactacystin-.beta.-lactone, and analogs thereof, that proceeds in fewer steps and in much greater overall yield than syntheses described in the prior art. The synthetic pathway relies upon a novel stereospecific synthesis of an oxazoline intermediate and a unique stereoselective addition of a formyl amide to the oxazoline. Also described are novel clasto-lactacystin-.beta.-lactones, and analogs thereof and their use as proteosome inhibitors.

A invenção atual é dirigida a uma síntese melhorada de clasto-lactacystin-.beta.-lactone, e aos analogs disso, que os rendimentos em poucas etapas e em um rendimento total muito mais grande do que sínteses descreveram na arte prévia. O pathway sintético confia em uma síntese stereospecific da novela de um oxazoline intermediário e em uma adição stereoselective original de um amido do formyl ao oxazoline. São descritos também a novela clasto-lactacystin-.beta.-lactones, e os analogs disso e seu uso como inibidores proteosome.

 
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