A Concise Synthesis of (±)-Methoxyfumimycin Ethyl Ester
摘要:
The protecting-group-free synthesis of (+/-)- methoxyfumimycin ethyl ester, a potential bacterial peptide deformylase (PDF) inhibitor, is reported. The synthetic approach features a tandem Friedel-Crafts alkylation/lactonisation access as a key reaction to generate alpha, alpha-disubstituted amino acid unit.
potential bacterial peptide deformylase inhibitor fumimycin are reported. The synthetic approach features a tandem Friedel–Crafts alkylation/lactonization access as key reaction to the α, α-disubstituted amino acid unit, and results in the synthesis of an advanced racemic intermediate with an Z configuration propenyl group starting from vanillin with 18 % total yield in five steps.
The concise and convergent total syntheses of (+)- and (−)-Fumimycin have been achieved by taking advantage of strategies for the asymmetric aza-Friedel–Crafts reaction of a highly substituted hydroquinone and N-fumaryl ketimine generated from the corresponding dehydroalanine. The enantiomerically pure natural product and its enantiomer were prepared in seven steps and 22% overall yield by employing
The antibiotic agent fumimycin has been synthesized for the first time. This natural product was found to inhibit the bacterial peptide deformylase and may represent a lead structure to a class of novel antibacterials. Our synthetic strategy towards fumimycin involved the following steps: Dakin oxidation of an aldehyde functionality, conversion of an oxime through radical fragmentation to form an
Synthesis of Methoxyfumimycin with 1,2-Addition to Ketimines
作者:Patrick J. Gross、Caroline E. Hartmann、Martin Nieger、Stefan Bräse
DOI:10.1021/jo902026s
日期:2010.1.1
The synthesis of (±)-methoxyfumimycin, a potential new bacterial peptide deformylase (PDF) inhibitor, is reported. To generate the stereogenic fully substituted carbon, the key step is a 1,2-addition of a methyl Grignard reagent to a ketimine. The overall synthetic strategy involves a Dakin oxidation of a vanillin derivative, Friedel−Crafts acylation, Claisen rearrangement, lactonization, and rhodium-catalyzed
Syntheses of isochromane analogues of the michellamines and korupensamines
作者:Charles B. de Koning、Joseph P. Michael、Willem A. L. van Otterlo
DOI:10.1039/a908367g
日期:——
Syntheses of the oxygen analogues 6, 7 and 8 of the michellamines 1 and korupensamines 2 are described. Racemic 5-iodo-6,8-dimethoxy-trans-1,3-dimethylisochromane 10 was synthesised in eleven steps from 2,4-dimethoxybenzaldehyde in an overall yield of 51%. The isopropoxy analogue 11 was synthesised in a similar manner. Isochromane 10 was coupled using Suzuki methodology with 4-isopropoxy-5-methoxy-7-methylnaphthalene-1-boronic acid 9 to produce 7 in 96% yield. This was converted in good yield into the desired product 6 by oxidative dimerisation followed by reduction of the cross-conjugated ene-dione intermediate 45.