Epoxyalcohol route to hydroxyethylene dipeptide isosteres. Stereodivergent synthesis of the diamino alcohol core of ritonavir and its C-2 epimer
| Autor: | Fabio Benedetti, Stefano Norbedo, Federico Berti |
|---|---|
| Přispěvatelé: | Benedetti, Fabio, Berti, Federico, Norbedo, Stefano |
| Rok vydání: | 2002 |
| Předmět: |
Allylic rearrangement
Inhibitor Ketone Stereochemistry Butanols Protease Inhibitor Epoxide Pyrimidinones Chemical synthesis Catalysis Lopinavir chemistry.chemical_compound HIV protease Organic chemistry Combinatorial Chemistry Techniques Protease Inhibitors ring opening dihydroxyethylene isoster chemistry.chemical_classification Dipeptide Ritonavir Molecular Structure Chemistry Organic Chemistry Stereoisomerism diaminodiol dihydroxyethylene isosters epoxide Dipeptides HIV Protease Inhibitors Alcohols Epimer Stereoselectivity Enone |
| Zdroj: | The Journal of organic chemistry. 67(24) |
| ISSN: | 0022-3263 |
| Popis: | A stereoselective synthesis of hydroxyethylene dipeptide isosteres based on the 1,4-diamino-2-hydroxybutane structure is described. Horner-Emmons olefination of phosphonates derived from alpha-amino acids, stereoselective reduction of the resulting enones to allylic alcohols, and syn epoxidation of the latter lead to enantiomerically pure 1-amino-2-hydroxy-3,4-epoxybutanes, key intermediates in the synthesis. Reductive cleavage of the epoxy alcohols with Red-Al proceeds in a highly regioselective way, giving 1-amino-2,4-dihydroxybutanes, from which diamino alcohol hydroxyethylene isosteres are obtained by selective protection of the secondary 2-hydroxy group, via cyclization to 1,3-oxazolidinone, and further elaboration of the 4-hydroxy. Both C-2 epimers of 1,4-diamino-2-hydroxybutanes are accessible by appropriate choice of the conditions for cyclization. The approach is demonstrated by the synthesis of a series of six hydroxyethylene dipeptide isosteres, including the diamino alcohol core of potent HIV-protease inhibitor ritonavir 18 and its C-2 epimer 11a. |
| Databáze: | OpenAIRE |
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