作者:Brian G. Jones、Sarah K. Branch、Michael D. Threadgill、Derry E.V. Wilman
DOI:10.1016/0022-1139(95)03284-k
日期:1995.10
An unusual cyclisation of Z-1,2,4-tris(benzamido)butene with trifluoroacetic anhydride gives Z-4-[1,3-bis(benzamido)prop-1-enyl]-2-phenyl-5-trifluoromethyloxazole (3). The structure and stereochemistry were confirmed by 1H, 13C and 19F NMR, together with 1H1H COSY, 1H1H NOESY and 1H → 19F and 19F → 1H heteronuclear NOE experiments. Trifluoroacetylation at the less sterically hindered N-acyl-enamine
Z -1,2,4-三(苯甲酰胺基)丁烯与三氟乙酸酐的不寻常环化反应生成Z -4- [1,3-双(苯甲酰胺基)丙-1-烯基] -2-苯基-5-三氟甲基恶唑(3)。的结构和立体化学被证实1 H,13 C和19 F NMR与,一起1个H 1 ħCOSY,1 H 1 ħNOESY和1个ħ→ 19 F和19个˚F→ 1个ħ异NOE实验。空间受阻较少的N处的三氟乙酰化-酰基-烯胺位置,随后环化和1,4-消除。