Synthetic methods for the preparation of basic - and -pseudo-sugars. Synthesis of carbocyclic analogues of -acetyl-muramyl--alanyl--isoglutamine (MDP)
作者:Derek H.R. Barton、S. Augy-Dorey、J. Camara、P. Dalko、J.M. Delaumény、S.D. Géro、B. Quiclet-Sire、P. Stütz
DOI:10.1016/s0040-4020(01)97594-5
日期:1990.1
been transformed by Ferrier rearrangement reaction into amino-cyclohexanones 11 12 and 23 24. Reduction of ketone 11 with tri-t-butoxy-aluminium hydride followed by sequential acetylation and hydrogenolysis gave the acid 14 which was coupled with dipeptide 15 to provide 16. Alkaline hydrolysis of the latter afforded 1 a carbocyclic nor-analogue of MDP. The second target molecule 2 was prepared from
容易从D-葡糖胺精制的两种环外烯烃10和22已经通过Ferrier重排反应转化为氨基-环己酮11 12和23 24。用三叔丁氧基铝氢化物还原酮11,然后依次进行乙酰化和氢解,得到酸14,将其与二肽15偶联,得到16。后者的碱性水解得到1 MDP的碳环或类似物。第二目标分子2由恶唑烷-假-D-葡糖胺27制备通过用甲氧基亚甲基三苯基磷烷和乙酸汞-硼氢化钠试剂处理氨基-环己酮23,可得到合成中的关键步骤。另一方面,烯烃31的硼氢化产生了假L-氨基胺衍生物28。桦木还原27,然后用(S)-α-氯丙酸依次进行亚苄基醚化,生成的36与二肽15缩合,得到36。后者的氢解提供了MDP的碳环类似物2。