Total synthesis of 6-deoxy-6-aminoheptopyranuronic acid derivatives
摘要:
Two enantio couples of terminal C-glycopyranosyl-alpha-amino acids, namely the aminopyranuronic acids L-9, D-9 and L-10, D-10, have been synthesized from the serine-derived pair L-2, D-2 by exploiting enantiomerically pure butenolide intermediates 3 and 4. The key synthetic steps involved the sequential antiselective cis dihydroxylation of the butenolide double bond and the clean furanose-to-pyranose ring expansion to construct the sugar skeleton with the proper stereochemistry. In our best performance, homogeneous L-9 was prepared from L-2 in four steps and 10 reactions in 20% overall yield.
The four-carbon elongation of three-carbon chiral synthons using 2-(trimethylsiloxy)furan: highly stereocontrolled entry to enantiomerically pure seven-carbon α,β-unsaturated 2,3-dideoxy-aldonolactones
作者:Giovanni Casiraghi、Lino Colombo、Gloria Rassu、Pietro Spanu、Giovanna Gasparri Fava、Marisa Ferrari Belicchi
DOI:10.1016/s0040-4020(01)87777-2
日期:1990.1
Synthesis of enantiomerically pure 2,3-dideoxy-hept-2-enono-1,4-lactone derivatives diastereoselective addition of 2-(trimethylsiloxy)furan to -glyceraldehyde and -serinal-based three-carbon synthons
Two enantio couples of terminal C-glycopyranosyl-alpha-amino acids, namely the aminopyranuronic acids L-9, D-9 and L-10, D-10, have been synthesized from the serine-derived pair L-2, D-2 by exploiting enantiomerically pure butenolide intermediates 3 and 4. The key synthetic steps involved the sequential antiselective cis dihydroxylation of the butenolide double bond and the clean furanose-to-pyranose ring expansion to construct the sugar skeleton with the proper stereochemistry. In our best performance, homogeneous L-9 was prepared from L-2 in four steps and 10 reactions in 20% overall yield.
Highly stereocontrolled total synthesis of 6-deoxy-6-aminoheptopyranuronic acid derivatives
An extremely selective synthesis of two novel α-aminouronic acids, the enantio-pair D-10 and L-10, through the butenolide intermediates D-2 and L-2 is described.