PANCRATISTATIN CYCLIC PHOSPHATE PRODRUGS AND PHENPANSTATIN CYCLIC PHOSPHATE PRODRUGS
申请人:Pettit George R.
公开号:US20080139509A1
公开(公告)日:2008-06-12
Selective phosphorylation of phenpanstatin (3a) with tetrabutylammonium dihydrogen phosphate and dicyclohexylcarbodiimide in pyridine followed by cation exchange chromatographic procedures was found to provide an efficient route to a new series (3b-3d) of promising 3,4-O-cyclic phosphate prodrugs designated phenpanstatin phosphates. Application of analogous reaction conditions to pancratistatin (1a) led to a mixture of monophosphate derivatives where sodium pancratistatin 4-O-phosphate (4a) was isolated and the structure confirmed by x-ray crystallography. Modification of the reaction conditions allowed direct phosphorylation of pancratistatin followed by cation exchange chromatography to afford sodium pancratistatin 3,4-O-cyclic phosphate (5b) which was selected for preclinical development.