Organocatalytic Enantioselective Allylic Etherification of Morita–Baylis–Hillman Carbonates and Silanols

The organocatalytic asymmetric allylic etherification reaction of Morita–Baylis–Hillman carbonates and silanols was reported for the first time. With modified cinchona alkaloid (DHQD)₂PYR as the catalyst, a series of aromatic, heterocyclic, or aliphatic Morita–Baylis–Hillman carbonates (25 examples) worked well with triphenylsilanol, affording the corresponding products in moderate to good yields (up to 98%), high regioselectivities (>20:1), and good enantioselectivities (up to 92%). When dimethylphenylsilanol was used as the nucleophile, the product was obtained in 60% yield and 87% ee.