Synthesis and stability of mixed nonfluorinated 1,1,1-trihalo-alkanes
摘要:
1, 1, 1-Trihaloalkanes of the types R-CCl2I, R-CClBrI, and R-CBr2I belonging to 1,1,1-trihalo-1-deoxy-D-arabinitol series of alditols were prepared and fully characterized by anomeric alkoxyl radical fragmentation of the corresponding 2,2-dihalo-2-deoxy-D-arabino-hexopyranose derivatives. The analogous diiodohalo compounds R-CClI2 and R-CBrI2 could not be prepared by this methodology. The results strongly suggest that the stability of the mixed trihalo alditols decreases with increasing bulkiness of the halogen atoms. (c) 2005 Elsevier Ltd. All rights reserved.
Synthesis and stability of mixed nonfluorinated 1,1,1-trihalo-alkanes
摘要:
1, 1, 1-Trihaloalkanes of the types R-CCl2I, R-CClBrI, and R-CBr2I belonging to 1,1,1-trihalo-1-deoxy-D-arabinitol series of alditols were prepared and fully characterized by anomeric alkoxyl radical fragmentation of the corresponding 2,2-dihalo-2-deoxy-D-arabino-hexopyranose derivatives. The analogous diiodohalo compounds R-CClI2 and R-CBrI2 could not be prepared by this methodology. The results strongly suggest that the stability of the mixed trihalo alditols decreases with increasing bulkiness of the halogen atoms. (c) 2005 Elsevier Ltd. All rights reserved.
Modified D-glucose and D-mannose analogs are potentially clinically useful metabolic inhibitors. Biological evaluation of 2-deoxy-2-halo analogs has been impaired by limited availability and lack of efficient methods for their preparation. We have developed practical synthetic approaches to 2-deoxy-2-fluoro-, 2-chloro-2-deoxy-, 2-bromo-2-deoxy-, and 2-deoxy-2-iodo derivatives Of D-glucose and D-mannose that exploit electrophilic addition reactions to a commercially available 3,4,6-tri-O-acetyl-D-glucal. (C) 2009 Elsevier Ltd. All rights reserved.