Efficient and scalable syntheses of enantiomerically pure (2R,1'S,2'R)- and (2S,1'S,2'R)-3-[2-mono(di,tri)fluoromethylcyclopropyl]alanines 9a–c, as well as allo-D-threonine (4) and (2S,3R)-β-methylphenylalanine (3), using the Belokon' approach with (S)- and (R)-2-[(N-benzylprolyl)amino]benzophenone [(S)- and (R)-10] as reusable chiral auxiliaries have been developed. Three new fluoromethyl analogues of the naturally occurring octadepsipeptide hormaomycin (1) with (fluoromethylcyclopropyl)alanine moieties have been synthesized and subjected to preliminary tests of their antibiotic activity.
高效且可扩展的合成方法已经开发出来,用于合成对映纯度高的(2
R,1'
S,2'
R)-和(2
S,1'
S,2'
R)-3-[2-单(二、三)
氟甲基环丙基]丙
氨酸
9a–
c,以及
allo-
D-苏氨酸(
4)和(2
S,3
R)-β-甲基苯丙
氨酸(
3),采用Belokon'方法,使用(
S)-和(
R)-2-[(
N-苯基丙酰基)
氨基]苯基酮[(
S)-和(
R)-
10]作为可重复使用的手性辅助基团。已合成三种新的含
氟甲基类似物,具有(
氟甲基环丙基)丙
氨酸基团,用于天然存在的八肽激素荷莫霉素(
1)的初步抗生素活性测试。