作者:H.P. Isenring、W. Hofheinz
DOI:10.1016/s0040-4020(01)92152-0
日期:1983.1
ring system which was transformed in 4 steps into 3-aminonocardicinic acid. A protected side chain of nocardicin D was synthesized from d-asparagine in 6 steps. Coupling of these units and further conversion to nocardicins A, B and D followed published procedures. Using l-asparagine for the synthesis of the side chain led to unnatural isonocardicin A. Biological activities of the products are compared
d-异丝氨酸或l-异丝氨酸,二苯基甲基异氰化物和对-(苄氧基)苯甲醛的四组分缩合被用于构建官能化的β-内酰胺环系统,该系统以4个步骤转化为3-氨基心酸。由d-天冬酰胺分6步合成诺卡替丁D的保护侧链。遵循已公布的程序,将这些单元偶联并进一步转化为诺卡汀A,B和D。使用l-天冬酰胺来合成侧链会导致非天然的异心卡那霉素A。比较了产品的生物活性。