BERGMAN, J.;LIDGREH, G., TETRAHEDRON LETT., 30,(1989) N4, C. 4597-4600
作者:BERGMAN, J.、LIDGREH, G.
DOI:——
日期:——
Bergman, Jan; Lidgren, Goeran; Gogoll, Adolf, Bulletin des Societes Chimiques Belges, 1992, vol. 101, # 7, p. 643 - 660
作者:Bergman, Jan、Lidgren, Goeran、Gogoll, Adolf
DOI:——
日期:——
Reaction of tryptophan with trifluoroacetic anhydride
作者:Jan Bergman、Göran Lidgren
DOI:10.1016/s0040-4039(01)80754-1
日期:1989.1
Trifluoroaceticanhydride (TFAA) in ether quickly (≈ 5–10 min) converted tryptophan to the crystalline 2-trifluoromethyl-5(4)-oxazolone (2) without racemization. Dissolution of optically active 2 in acetonitrile gave racemic 2, whereas treatment with hot aqueous dioxane gave the isomeric oxazolone (3). Both 2 and 3, could on heating be further isomerized to the conjugated oxazolone (4). These oxazolones