Acetonide-tethered alkynes

Acetonide-tethered alkynes (236), in fact masked diols, have been converted into the corresponding ketals (237) using a similar strategy (n = l, 2 Y = 0, NBn, NC02Me R = H, D, alkyl, Ar, alkynyl).i53.iS4... 

Bridged acetals have been prepared from acetonide-tethered alkynes with gold catalysis in the presence of water by regioselective bis-oxycyclization of the oxygen atom to the internal alkyne carbon (Scheme 128). ... 

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See also in sourсe #XX -- [ ]

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