Potential inhibitors of L-asparagine biosynthesis. 5. Electrophilic amide analogs of (S)-2,3-diaminopropionic acid
作者:Michael Mokotoff、Lawrence W. Logue
DOI:10.1021/jm00137a015
日期:1981.5
respectively. Deblocking of 6a-c gave the corresponding amino acids (S)-2-amino-3-(2-bromoacetamido)propionic acid hydrobromide (7a), (S)-2-amino-3-(2,2-dichloroacetamido)propionic acid (7b), and ethyl N-[(S)-2-amino-2-carboxyethyl]fumarate (7c). By a slightly different procedure, 5 was converted in two steps to (S)-2-amino-3-acetamidopropionic acid hydrobromide (7d). The inhibition of ASase by 7a-c at 1
已经制备了三种(S)-2,3-二氨基丙酸(1,DAP)的亲电酰胺类似物作为L-天冬酰胺合成酶的潜在抑制剂(ASase,来自Novikoff肝癌,EC 6.3.5.4)。DAP被碳苯并(Cbz)基团选择性阻断,得到3-N-Cbz-DAP(2a)。用异丁烯将2a酯化,得到3-N-碳-苄氧基-(S)-2,3-二氨基丙酸叔丁酯(3a),然后在2位用叔丁氧羰基(Boc)封闭,得到叔丁基2-[(S)-(叔丁氧基羰基)氨基] -3-[(碳苯甲氧基)氨基]丙酸酯(4)。H2 / Pd对Cbz基团的选择性裂解产生了关键中间体2-N-(叔丁氧基羰基)-(S)-2,3-二氨基丙酸叔丁酯(5),该中间体通过N-羟基琥珀酰亚胺酯被酰化,含溴乙酸,二氯乙酸,和富马酸单乙酯得到2-[((S)-(叔丁氧基羰基)-氨基] -3-(2-溴乙酰胺基)丙酸叔丁酯(6a),2-[(S)-(叔丁基)叔丁酯-丁氧基羰基)氨基] -3-(2