Synthesis and conformational and configurational studies of diastereoisomeric O-protected 4-(aryisulfonimidoyl)butane-1,2,3-triols

Reference:

Kwong, J. S. W., Mahon, M. F., Lloyd, M. D. and Threadgill, M. D., 2007. Synthesis and conformational and configurational studies of diastereoisomeric O-protected 4-(aryisulfonimidoyl)butane-1,2,3-triols. Tetrahedron, 63 (51), pp. 12601-12607.

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Abstract

Chiral sulfoximines have applications as transition-state mimicking enzyme inhibitors, as peptide isosteres and as chiral auxiliaries in synthesis. To access the required O-protected 4-(arylsulfonimidoyl)butane-1,2,3-triols, 4S,5S-di(hydroxymethyl)-2,2-dimethyl-1,3dioxolane (prepared from diethyl R,R-tartrate) was converted into its monobenzyl ether. Mitsunobu-like coupling with thiophenols gave 4S,5R-4-(benzyloxymethyl)-2,2-dimethyl-5-(arylthiomethyl)-1,3-dioxolanes . Sulfoxidation and S-imination (trifluoroacetamide, iodosobenzene iacetate, rhodium acetate) proceeded without stereoselectivity, giving inseparable diastereomeric mixtures of 4S,5R,S(+/-)-4-(benzyloxymethyl)-2,2-dimethyl-5-(N-(trifluoroacetyl)aryl sulfonimidoylmethyl)-1,3-dioxolanes. Removal of the trifluoroacetyl protection allowed chromatographic separation of the diastereomeric 4S,5R,S(+/-)-4-(benzyloxymethyl)-2,2-dimethyl-5-(arylsulfonimidoylmethyl )1,3-dioxolanes. The configurations at sulfur were determined by X-ray crystallography and some analysis of the solution and solid-state conformations was carried out. The resulting O-protected 4-(arylsulfonimidoyl)butane-1, 2,3 -triols are of use in developing enzyme inhibitors. (c) 2007 Elsevier Ltd. All rights reserved.

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