Additional studies examined the scope of oxime carbonates, wherein reactions of sterically congested 3,3-disubstituted oxime carbonates 2b and 2c, as well as sterically less hindered oxetan-3-one-derived oxime carbonate 2e all proceed smoothly to give the corresponding products 7x-z with satisfactory results. Notably, all these examples display exclusive 1,2-regioselectivity in the addition to 1,3-enynes, although there are two possible sites for the addition. The absolute configuration of 7q was determined by chiroptical methods (see Supporting Information, section 7).