Synthesis of Cyclic Acylated Enamino Esters from Enol Lactones, 4-Keto amides, and 5-Hydroxy Lactams
作者:A. D. Abell、M. D. Oldham、J. M. Taylor
DOI:10.1021/jo00110a026
日期:1995.3
Enol lactones react with an amine to give either a keto amide or a hydroxy lactam under mild conditions. Subsequent dehydration with p-toluenesulfonic acid (PTSA) gives a cyclic acylated enamino ester in good yield (Tables 1 and 2, Schemes 2 and 4). The key prostaglandin analog precursor 18 and the gly-gly dipeptide analogs 26a and 26b were prepared using the reported conditions. Acetylation of the chloro hydroxy lactam 31, prepared from the chloro enol lactones 29, followed by elimination of acetic acid gave the chloro acylated enamino esters 28.
Lukes et al., Collection of Czechoslovak Chemical Communications, 1947, vol. 12, p. 647,650
作者:Lukes et al.
DOI:——
日期:——
Lukes, Collection of Czechoslovak Chemical Communications, 1932, vol. 4, p. 81,360
作者:Lukes
DOI:——
日期:——
ORR, D. E., SYNTHESIS, BRD, 1984, N 7, 618-619
作者:ORR, D. E.
DOI:——
日期:——
�ber Umsetzungen des ?-Keto-adipins�ure-esters; Synthese von Stickstoff-Heterocyclen, insbesondere Pyrrolonen undd,l-Ecgonins�ure. (50. Mitteilung �ber Stickstoff-Heterocyclen)