Synthesis of 4-Diphosphocytidyl-2-C-methyl-d-erythritol and 2-C-Methyl-d-erythritol-4-phosphate
摘要:
2-C-Methyl-D-erythritol 4-phosphate (MEP, 2) and 4-diphosphocytidyl-2-C-methyl-D-erythritol (CDPME, 3) are metabolites in the MEP pathway for biosynthesis of isoprenoid compounds in bacteria, plant chloroplasts, and algae. The free phosphoacid of 2 was prepared from benzyloxyacetone in five steps with an overall yield of 27% and an enantiomeric ratio (er) of 75:25. Following titration to the corresponding tributylammonium salt, 2 was coupled to cytidine 5'-monophosphate using a protocol originally developed for synthesis of base-sensitive nucleoside diphosphate sugars to give 3 in 40% yield, following purification by size exclusion chromatography.
Synthesis of 4-Diphosphocytidyl-2-C-methyl-d-erythritol and 2-C-Methyl-d-erythritol-4-phosphate
摘要:
2-C-Methyl-D-erythritol 4-phosphate (MEP, 2) and 4-diphosphocytidyl-2-C-methyl-D-erythritol (CDPME, 3) are metabolites in the MEP pathway for biosynthesis of isoprenoid compounds in bacteria, plant chloroplasts, and algae. The free phosphoacid of 2 was prepared from benzyloxyacetone in five steps with an overall yield of 27% and an enantiomeric ratio (er) of 75:25. Following titration to the corresponding tributylammonium salt, 2 was coupled to cytidine 5'-monophosphate using a protocol originally developed for synthesis of base-sensitive nucleoside diphosphate sugars to give 3 in 40% yield, following purification by size exclusion chromatography.
The Asymmetric Aza-Claisen Rearrangement: Development of Widely Applicable Pentaphenylferrocenyl Palladacycle Catalysts
作者:Daniel F. Fischer、Assem Barakat、Zhuo-qun Xin、Matthias E. Weiss、René Peters
DOI:10.1002/chem.200900712
日期:2009.9.7
has a broader substrate tolerance than all previously known catalyst systems for asymmetric aza‐Claisen rearrangements. Our investigations also reveal that subtle changes can have a big impact on the activity. With the enhanced catalyst activity, the asymmetric aza‐Claisen rearrangement has a very broad scope: the methodology not only allows the formation of highly enantioenriched primary allylic amines
Stereospecific Asymmetric Synthesis of Tertiary Allylic Alcohol Derivatives by Catalytic [2,3]‐Meisenheimer Rearrangements
作者:Xin Yu、Nick Wannenmacher、René Peters
DOI:10.1002/anie.202001725
日期:2020.6.26
Chiral acyclic tertiary allylicalcohols are very important synthetic building blocks, but their enantioselective synthesis is often challenging. A major limitation in catalytic asymmetric 1,2‐addition approaches to ketones is the enantioface differentiation by steric distinction of both ketone residues. Herein we report the development of a catalytic asymmetric Meisenheimer rearrangement to overcome
Synthesis of 2-substituted bicyclo[1.1.0]butanes <i>via</i> zincocyclopropanation using bromoform as the carbenoid precursor
作者:Léa Thai-Savard、André B. Charette
DOI:10.1039/d3cc00335c
日期:——
Through a revisited Simmons–Smith type zincocyclopropanation using bromoform as the carbenoid source, the synthesis of 2-, 2,2- and 2,4-substituted bicyclo[1.1.0]butanes is reported. Few antecedents of the derivatives have yet been described. Ultimately, the underexplored scaffolds exhibited a complete discrepency of reactivity.
Asymmetric Formation of Allylic Amines with N-Substituted Quaternary Stereocenters by PdII-Catalyzed Aza-Claisen Rearrangements
作者:Daniel F. Fischer、Zhuo-qun Xin、René Peters
DOI:10.1002/anie.200702086
日期:2007.10.8
Synthesis of 4-Diphosphocytidyl-2-<i>C</i>-methyl-<scp>d</scp>-erythritol and 2-<i>C</i>-Methyl-<scp>d</scp>-erythritol-4-phosphate
作者:Andrew T. Koppisch、C. Dale Poulter
DOI:10.1021/jo025736o
日期:2002.7.1
2-C-Methyl-D-erythritol 4-phosphate (MEP, 2) and 4-diphosphocytidyl-2-C-methyl-D-erythritol (CDPME, 3) are metabolites in the MEP pathway for biosynthesis of isoprenoid compounds in bacteria, plant chloroplasts, and algae. The free phosphoacid of 2 was prepared from benzyloxyacetone in five steps with an overall yield of 27% and an enantiomeric ratio (er) of 75:25. Following titration to the corresponding tributylammonium salt, 2 was coupled to cytidine 5'-monophosphate using a protocol originally developed for synthesis of base-sensitive nucleoside diphosphate sugars to give 3 in 40% yield, following purification by size exclusion chromatography.