An Improved Approach to Chiral Cyclopentenone Building Blocks. Total Synthesis of Pentenomycin I and Neplanocin A
作者:John K. Gallos、Christos I. Stathakis、Stefanos S. Kotoulas、Alexandros E. Koumbis
DOI:10.1021/jo050987t
日期:2005.8.1
An improved approach to enantiomerically pure hydroxylated cyclopentenones is reported here, which involves intramolecular nitrone cycloaddition of sugar-derived chiral pent-4-enals and hex-5-en-ones-2 followed by N−O bond cleavage, quaternization of the amine thus produced, and finally oxidative elimination of the amino group. Synthesis of pentenomycin I and neplanocin A is described following this
Studies towards the synthesis of ertugliflozin from l-Arabinose
作者:Virginia V. Triantakonstanti、Olga G. Mountanea、Kyriaki-Eleni C. Papoulidou、Thanos Andreou、Theocharis V. Koftis、John K. Gallos
DOI:10.1016/j.tet.2018.08.005
日期:2018.9
A new method for the diastereoselective synthesis of enantiomerically pure ertugliflozin was developed. The crucial step involves an aldol condensation between 1-(4-chloro-3-(4-ethoxybenzyl)phenyl)ethanone and (4R,5R)-5-(((tert-butyldimethylsilyl)oxy)methyl)-2,2-dimethyl-5-((trityloxy)methyl)-1,3-dioxolane-4-carbaldehyde, which was prepared from known 2-C-trityloxymethyl-2,3-O-isopropylidene-l-erythrose
作者:John K Gallos、Katerina C Damianou、Constantinos C Dellios
DOI:10.1016/s0040-4039(01)01099-1
日期:2001.8
A new total synthesis of enantiomerically pure pentenomycin has been achieved by the intramolecular nitrone cycloaddition of the proper γ-unsaturated aldehyde, easily accessible from l-arabinose, followed by reductive NO bond cleavage and further oxidative deamination of the resulting aminocyclopentitol.