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A new method for the deprotection of prop-2-ynyl ethers 1b-9b is described. Isomerisation of 1b-9b to O-allenyl ethers 1d-9d and deprotection by reaction with Hg(OCOCF 3 ) 2 , aq.HCl, aq.CF 3 CO 2 H and best by use of a catalytic amount of OsO 4 is described to obtain the alcohols 1a-9a in good yield. Application of this method for the deprotection of prop-2-enyl...
Commercially available β-d-glucopyranose pentaacetate, β-d-galactopyranose pentaacetate and β-d-lactose heptaacetate were reacted with propargyl alcohol in the presence of BF 3 -Et 2 O catalyst to obtain in high yield and selectivity, the corresponding propargyl derivatives, respectively. These were hydrogenated by use of Lindlar catalyst to give the corresponding allyl β-d-glycopyranosides...
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