In the presence of allyl tri-n-butyltin--AIBN, cyclopropylmethyl bromides/xanthates undergo ring-opening reaction with concomitant formation of geminal diallyl derivatives in good yields. The ring closing metathesis reactions on geminal diallyl derivatives with Grubbs' catalyst provided spirocyclopentenyl products. Combination of these two methodologies has been applied to the synthesis of mono-, bis-cyclopentyl-carbohydrates as well as spirocyclopentylproline derivatives.
Nucleic acids U 0700Clay-Mediated Selective Hydrolysis of 5'-O-Acetyl-2',3'-isopropylidene/Cyclohexylidene Nucleosides. -Advantages of the title procedure are selectivity towards isopropylidene groups, recovery of the catalyst by simple filtration, low costs, commercial availability and little hazard in handling. -(GURJAR*, M. K.; MONDAL, D.; RAVINDRANADH, S. V.; CHORGHADE, M. S.; Synth.
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