We report an asymmetric synthesis of (1R,4R)-N-acyl-2-oxa-5-aza-bicyclo[2.2.1]heptan-3-ones, starting from the inexpensive and commercially available trans-4-hydroxy-L-proline and achieved by treating N-acyl-trans-4-hydroxy-L-prolines with acetic anhydride. The formation of intermediate mesoionic compounds may explain the formation of N-acyl-2-oxa-5-aza-bicyclo[2.2.1]heptan-3-ones with (R)-absolute configuration at C(4). Acidic cleavage of these lactones readily affords N-acyl-cis-4-hydroxy-D-prolines or cis-4-hydroxy-D-proline in good yields.

Stereoselective synthesis of (1R,4R)-N-acyl-2-oxa-5-aza-bicyclo[2.2.1]heptan-3-ones via mesoionic compounds. An improved synthesis of cis-4-hydroxy-D-proline / P. Dalla Croce, C. La Rosa. - In: TETRAHEDRON-ASYMMETRY. - ISSN 0957-4166. - 13:2(2002), pp. 197-201. [10.1016/S0957-4166(02)00074-5]

Stereoselective synthesis of (1R,4R)-N-acyl-2-oxa-5-aza-bicyclo[2.2.1]heptan-3-ones via mesoionic compounds. An improved synthesis of cis-4-hydroxy-D-proline

P. Dalla Croce
Primo
;
C. La Rosa
Ultimo
2002

Abstract

We report an asymmetric synthesis of (1R,4R)-N-acyl-2-oxa-5-aza-bicyclo[2.2.1]heptan-3-ones, starting from the inexpensive and commercially available trans-4-hydroxy-L-proline and achieved by treating N-acyl-trans-4-hydroxy-L-prolines with acetic anhydride. The formation of intermediate mesoionic compounds may explain the formation of N-acyl-2-oxa-5-aza-bicyclo[2.2.1]heptan-3-ones with (R)-absolute configuration at C(4). Acidic cleavage of these lactones readily affords N-acyl-cis-4-hydroxy-D-prolines or cis-4-hydroxy-D-proline in good yields.
Settore CHIM/06 - Chimica Organica
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/190225
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