Tetrahedron Letters p. 7943 - 7946 (1997)
Update date:2022-08-03
Topics:
Alonso, Diego A.
Costa, Ana
Najera, Carmen
N-Boc-α-tosylsarcosine ethyl ester (3) reacts under neutral conditions either with allylic carbonates or with vinyloxirane in the presence of a catalytic mount of Pd(PPh3)4 and dppe (5 mol%) to give regio- and stereoselectively the corresponding allylated products 5 and 6, respectively. Reductive desulfonylation of these compounds with Mg-MeOH affords the corresponding protected γ,δ-unsaturated N-methyl-α-amino acids 7 and 8.
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