Abstract Kojitriose [α- d -Glc p -(1→2)-α- d -Glc p -(1→2)- d -Glc p ], kojitetraose, and koji-pentaose have been synthesised by silver perchlorate-promoted Koenigs-Knorr type condensations, using 3,4,6-tri- O -acetyl-2- O -allyl-β- d -glucopyranosyl chloride and hepta- O -acetyl-β-kojibiosyl chloride as the key intermediates. The synthesis of α-β-Glc p -(1→2)-α- d -Glc p -(1→3)- d -Glc p is also described