N-Benzyl-N-carbobenzyloxy-O-tert-butyldimethylsilyl-D-serinal (6) was react
ed under Barbier conditions with allyl bromide affording diastereoselective
ly (82:18) the anti-adduct 5, which was subsequently transformed into (2S,4
S,5R)-(-)-bulgecinine (1). (C) 2001 Elsevier Science Ltd. All rights reserv
ed.