The first totalsynthesis of terpioside B (1 ) has been accomplished. Key steps include the stereoselective installments of a set of challenging 1,2‐cis‐glycosidic linkages. Thus, α(1,4)‐linked d ‐galactoside was effectively constructed from a 1,2‐anhydrogalactose donor and an unprotected 1,6‐anhydrogalactose acceptor by using a boron‐mediated aglycon delivery (BMAD) method. In addition, α‐l ‐fucofuranosides