Conjugate additions of E-alkenylphosphonates to lithiated Schöllkopf's bislactim ether: Stereocontrolled access to anti 2-amino-3-substituted-4-phosphonobutanoic acids
作者:Vicente Ojea、Ma Carmen Fernández、María Ruiz、JoséMa Quintela
DOI:10.1016/0040-4039(96)01230-0
日期:1996.8
Highly face-selective Michael addition of lithiatedSchöllkopf'sbislactimether (derived from cyclo-[L-val-glyl] 7) to E-alkenylphosphonates 2a-d and 1,3-butadienylphosphonate 2e allows a direct and stereocontrolledaccess to the excitatory amino acid analogues 2,3-anti-2-amino-3-substituted-4-phosphonobutanoic acids 14a-d and 2-amino-6-phosphono-4-hexenoic acid 15. The relative stereochemistry was