Synthesis of deuterated isotopomers of 7α- and (25R,S)-26-hydroxycholesterol, internal standards for in vivo determination of the two biosynthetic pathways of bile acids
摘要:
Deuterated isotopomers of 7alpha- and (25R,S)-26-hydroxycholesterol, internal standards for in vivo determination of the two biosynthetic pathways of bile acids formation from cholesterol, were prepared from [2,2,3,4,4,6-H-2(6)]-cholesterol and (20S)-[7,7,21,21-H-2(4)]-3beta-(tert-butyldimethylsilyl)oxy-20-methylpregna-5-en-21-ol, respectively. (C) 2003 Elsevier Inc. All rights reserved.
Synthesis of deuterated isotopomers of 7α- and (25R,S)-26-hydroxycholesterol, internal standards for in vivo determination of the two biosynthetic pathways of bile acids
作者:P Ciuffreda
DOI:10.1016/s0039-128x(03)00116-8
日期:2003.10
Deuterated isotopomers of 7alpha- and (25R,S)-26-hydroxycholesterol, internal standards for in vivo determination of the two biosynthetic pathways of bile acids formation from cholesterol, were prepared from [2,2,3,4,4,6-H-2(6)]-cholesterol and (20S)-[7,7,21,21-H-2(4)]-3beta-(tert-butyldimethylsilyl)oxy-20-methylpregna-5-en-21-ol, respectively. (C) 2003 Elsevier Inc. All rights reserved.
Synthesis of (20S)-[7,7,21,21-2H4]-3β-(tert-butyldimethylsilanyloxy)-20-methyl-pregn-5-en-21-ol, a useful intermediate for the preparation of deuterated isotopomers of sterols
ethyl (20S)-3beta-(tert-butyldimethylsilanyloxy)-7-oxo-pregn-5-en-20-carboxylate. Using controlled experimental conditions, it has also been shown that the dichloroaluminum hydride reduction of a 7-ketosteroid affords the corresponding 7beta-hydroxy derivative in a highly stereoselective manner.