Regioselective and 1,2‐cis‐α‐stereoselectiveglycosylations using 1α,2α‐anhydro glycosyl donors and diol glycosylacceptors in the presence of a glycosyl‐acceptor‐derived boronic ester catalyst. The reactions proceed smoothly to give the corresponding 1,2‐cis‐α‐glycosides with high stereo‐ and regioselectivities in high yields without any further additives under mild reaction conditions. In addition