The ring contraction of δ-lactones with leaving group α-substituents: a strategy for the synthesis of 2,5-disubstituted highly functionalised homochiral tetrahydrofurans
Approach to oxetane and furan nucleosides with an anomeric carbon substituent: Nucleophilic substitution at highly hindered α-bromo-oxetane- and -tetrahydrofuran-carboxylates
Treatment of oxetane-2-carboxylic esters with lithium hexamethyldisilazide generates anions which can be trapped with carbon tetrabromide to give epimeric 2-bromo-oxetane-2-carboxylic esters which undergo rapid displacement of bromide by azide with clean inversion of configuration. This may provide an approach to the synthesis of oxetane nucleosides possessing a carbon substituent at the anomeric position. An example of similar chemistry applied to tetrahydrofuran-2-carboxylic ester is also reported.
Convergent Total Synthesis of Asimicin via Decarbonylative Radical Dimerization
exhibits potent antitumor activity and comprises a central C2‐symmetric bis‐tetrahydrofuran and two aliphatic side‐chains, one of which terminates with (S)‐methyl‐2(5H)‐furanone. This work reports a convergent total synthesis of 1 in 17 steps from d‐gulose derivative 4. Decarbonylative radical‐radial homo‐coupling of α‐alkoxyacyl telluride 12 a efficiently produced the C2‐symmetric core 3‐SS, which was
The ring contraction of δ-lactones with leaving group α-substituents: a strategy for the synthesis of 2,5-disubstituted highly functionalised homochiral tetrahydrofurans
作者:Sik-Man S. Choi、Paul M. Myerscough、Antony J. Fairbanks、Ben M. Skead、Claire J. F. Bichard、Simon J. Mantell、Jong Chan Son、George W. J. Fleet、John Saunders、David Brown
DOI:10.1039/c39920001605
日期:——
Treatment of derivatives of δ-lactones having a leaving group at C-2 with methanol in the presence of base gives methyl tetrahydrofuran-α-carboxylates in good to excellent yield with a high degree of stereocontrol of the carbon substituents at C-2 and C-5.