Asymmetric synthesis of α-methoxyarylacetic acid derivatives
摘要:
Stereoselective synthesis of a series of 2-aryl-2-methoxyethanols was achieved from inexpensive chiral pool tartaric acid employing a diastereoselective reduction of a symmetrical 1,4-diaryldiketone as the key step. 2-Aryl-2-methoxyethanols were enantioselectively prepared in 80-90% yield (c) 2005 Elsevier Ltd. All rights reserved.
The diastereoselective nucleophilic trifluoromethylation of a range of ketoamides derivedfrom L-tartaric acid has been studied. TMSCF3 in the presence of a catalytic amount of K2CO3 in DMF has been identified as the conditions leading to the highest diastereoselectivities. A sequential one-pot reaction trifluoromethylation-etherification of the trifluoromethylcarbinol has been developed. Only one
Nucleophilic Addition Reactions of 1,4-Diketones Derived from Tartaric Acid: Synthesis of TADDOL Analogues
作者:Kavirayani Prasad、Appayee Chandrakumar
DOI:10.1055/s-2006-942422
日期:2006.7
A systematic investigation of the reduction and Grignard reagents addition to 1,4-diketones derived from tartaric acid was carried out. It was found that the reduction proceeded with high selectivity using K-Selectride as the reducing agent; while Grignard reagent addition was highly dependent on structure of the dione as well as on the Grignard reagent. The resultant 1,4-diols represent a series of novel TADDOL analogues.
Synthesis of Enantiopure Trifluoromethyl Building Blocks via a Highly Chemo- and Diastereoselective Nucleophilic Trifluoromethylation of Tartaric Acid-Derived Diketones
acid-based diketone, using trifluoromethyl(trimethyl)silane, afforded the corresponding γ-keto trifluoromethylcarbinol. The scope and limitation of this reaction was studied. The acidic removal of the acetonide moiety protecting the two hydroxyl groups of the adducts was unsuccessful. Bis(O-methylation) of the aromatic derivatives under basic conditions, followed by acidic hydrolysis and oxidative cleavage
Asymmetric synthesis of α-methoxyarylacetic acid derivatives
作者:Kavirayani R. Prasad、Appayee Chandrakumar
DOI:10.1016/j.tetasy.2005.05.002
日期:2005.6
Stereoselective synthesis of a series of 2-aryl-2-methoxyethanols was achieved from inexpensive chiral pool tartaric acid employing a diastereoselective reduction of a symmetrical 1,4-diaryldiketone as the key step. 2-Aryl-2-methoxyethanols were enantioselectively prepared in 80-90% yield (c) 2005 Elsevier Ltd. All rights reserved.