Reductive Etherification via Anion-Binding Catalysis. 
Reductive condensations of alcohols with aldehydes/ketones to generate ethers are catalyzed by a readily accessible thiourea organocatalyst that operates in combination with HCl.  1,1,3,3-tetramethyldisiloxane serves as a convenient reducing reagent.  This strategy is applicable to challenging substrate combinations and exhibits functional group tolerance.  Competing reductive homocoupling of the carbonyl component is suppressed.