Synthesis of a New C(1→2)‐Linked Iminodisaccharide Starting from Levoglucosenone

Methyl 2‐deoxy‐2‐(1S)‐2,5‐dideoxy‐2,5‐imino‐L ‐ribitol‐1‐C‐yl)‐α‐D ‐glucopyranoside ((+)‐ 6 ) was obtained from the product of Nozaki‐Kishi coupling of 2,5‐{(tert‐butoxy)carbonyl]imino}‐2,5‐dideoxy‐3,4‐O‐isopropylidene‐L ‐ribose ((?)‐ 9 ) and 4‐O‐benzyl‐6‐O‐(benzyloxy)methyl]‐3‐deoxy‐2‐O‐(trifluoromethyl)sulfonyl]‐α‐D ‐erythro‐hex‐2‐enopyranoside ((+)‐ 12 ). The alkenyl triflate (+)‐ 12 was derived from levoglucosenone ( 1 ).