Synthesis of Optically Active, Ring-Substituted N-Benzyloxycarbonylphenylalaninesvia 2-Benzyloxycarbonylamino-2-arylalkylmalonates
作者:Hans Rudolf Bosshard、Arieh Berger
DOI:10.1002/hlca.19730560603
日期:1973.7.18
hydrolysis led to the N-benzyloxycarbonyl-L-amino acids (15 to 18) and to the corresponding D-amino acid esters. The latter were converted to the N-benzyloxycarbonyl-D-amino acids (19 and 20) by alkaline hydrolysis of the ester groups. These derivatives could be used directly for further peptide synthesis. The following compounds were prepared: N-benzyloxycarbonyl derivatives of p-methyl-L-phenylalanine
使二乙基或二甲基苄氧基羰基氨基丙二酸酯与环取代的苄基卤化物反应,并将所得的芳基烷基衍生物(3至6)半皂化为DL-单酸-单酯(7至10)。通过在二恶烷中回流脱羧得到N-苄基氧羰基-DL-氨基酸酯(11至14),其通过用枯草杆菌蛋白酶Carlsberg型酶水解该酯基而分解成它们的旋光对映体。酶水解产生N-苄氧基羰基-L-氨基酸(15至18)和相应的D-氨基酸酯。通过酯基的碱性水解将后者转化为N-苄氧基羰基-D-氨基酸(19和20)。这些衍生物可直接用于进一步的肽合成。制备下列化合物:N-苄氧基羰衍生物p -甲基-L-苯丙氨酸(15),p -甲基- d -苯丙氨酸(19),p氟-L-苯丙氨酸(16),米氟- L-苯丙氨酸(17),米氟d -苯丙氨酸(20)和五氟-L-苯丙氨酸(18)。通过在乙酸中用HBr除去苄氧羰基获得游离氨基酸。