Total syntheses of (+)-hypusine and its (2S,9S)-diastereomer
摘要:
The total synthesis of (2S,9R)-hypusine dihydrochloride, an unusual amino acid constituent of the eukaryotic translation initiation factor eIF-4D, and its (2S,9S) diastereomer is described. The key step in the syntheses involves the Nepsilon-alkylation of Nepsilon-benzyl-Nalpha-(L)-lysine benzyl ester with (R)- or (S)-epichlorohydrin to give the respective (2S,9R) and (2S,9S) chlorohydrins. Subsequent displacement of the respective chlorides by cyanide ion provides the protected hypusine skeletons. The final step, hydrogenation over PtO2 in AcOH followed by neutralization and reacidification, yielded the respective (2S,9S)- and (2S,9R)-hypusine dihydrochlorides in excess of 50% overall yield.
DOI:
10.1021/jo00076a048
作为产物:
描述:
N-alpha-Cbz-L-赖氨酸 、 对甲苯磺酸 、 水 、 对甲苯磺酸一水合物 在
乙醚 作用下,
以
苯甲醇 、 甲苯 为溶剂,
以to afford 12 g (62%) of the title compound, ν (Nujol) 3370, 1735, 1692, 1040, 1015, 820, 745, 735, 700, 685 cm-1的产率得到Nα-benzyloxycarbonyl-L-lysine benzyl ester p-toluenesulfonate
参考文献:
名称:
A-deoxy-a-aza derivatives of clavulanic acid, a process for their
Hypusine, a new basic amino acid occurring in the homogenate of bovine brain tissue, was synthesized to determine the absolute structure. Nα-Benzyloxycarbonyl-l-lysine benzyl ester was coupled with (S)- or (R)-4-benzyloxycarbonylamino-1-bromo-2-butanol derived from l- or d-malic acid, respectively. The products were deprotected by catalytic hydrogenation. One of the synthetic compounds, i.e., (2S,9R)-2,11-diamino-9-hydroxy-7-azaundecanoic acid, was completely identical with natural hypusine in all respects.
Derivatives of clavulanic acid, a process for their preparation and
申请人:Beecham Group p.l.c.
公开号:US04539202A1
公开(公告)日:1985-09-03
The compounds of the formula (II): ##STR1## or pharmaceutically acceptable salts or esters thereof wherein A is a hydrogen atom or an esterifying radical; X is an alkyl group of 1-12 carbon atoms optionally substituted by a hydroxy, amino, acylamino of C.sub.1-6 alkoxy group, which substituents are not on the carbon atom adjacent to the nitrogen atom; or a C.sub.5-7 cycloalkyl group; or a phenylalkyl group wherein the carbon atom content of the alkyl part is 1-6 and the phenyl part is optionally substituted with a fluorine, bromine, chlorine, C.sub.1-6 alkyl, or C.sub.1-6 alkoxy; with the proviso that when X represents an optionally substituted phenylalkyl group and A represents C.sub.1-3 alkyl, then the --CO.sub.2 A group is attached to the alkyl part of the phenylalkyl group; have been found to be .beta.-lactamase inhibitors and antibacterial agents. Their preparation and use is described.
Synthesis and Antitumor Activity of Conjugates of Muramyldipeptide, Normuramyldipeptide, and Desmuramylpeptides with Acridine/Acridone Derivatives
作者:Krystyna Dzierzbicka、Aleksander M. Kołodziejczyk、Barbara Wysocka-Skrzela、Andrzej Myśliwski、Danuta Sosnowska
DOI:10.1021/jm001115g
日期:2001.10.1
The synthesis of two groups (Chart 1, types A and B) of conjugates of MDP (muramyldipeptide) and nor-MDP (normurainyldipeptide) with acridine/acridone derivatives and the synthesis of analogues of desmuramylpeptides (Chart 1, types C and D), containing acridine/ acridone derivatives have been described. In type A conjugates, the hydroxyl group at C6 of the sugar moiety was acylated with acridine/acridone N-substituted omega -aminoalkanocarboxylic acids (Scheme 1), whereas the conjugates of type B (Table 2) and three analogues of type C or D (Scheme 2) have an amide bond formed between the carboxylic group of isoglutamine and the amine function of the respective acridine/acridone derivatives. The preliminary screening data indicate that the analogues of groups A, C, and D exhibit small cytotoxic activity, whereas several analogues of type B, 4b, 4c, 4e, 4g, 4h, 4i, and 4l, exhibiting potent in vitro cytotoxic activity against a panel of human cell lines (Table 4), have been selected by the National Cancer Institute (NCI) Evaluation Committee for further testing. Analogues 4b and 4h were active in the in vivo hollow fiber assay (Table 5). Analogue 3a shows an immunostimulating effect on the cytotoxic activity of the NX cells obtained from the spleen of healthy and Ab melanoma bearing animals.
Synthesis of hypusine and other polyamines using dibenzyltriazones for amino protection
作者:Spencer Knapp、Jeffrey J. Hale、Margarita Bastos、Audrey Molina、Kuang Yu Chen
DOI:10.1021/jo00049a036
日期:1992.11
The use of 1,3-dibenzyl-5-substituted-hexahydro-2-oxo-1,3,5-triazine ("dibenzyltriazone") as a protecting group for primary amino is described. Optimized conditions for formation and hydrolysis of dibenzyltriazones, as well as a variety of transformations (reduction, oxidation, hydroxyl modification, C-C bond formation) compatible with this protecting group, are presented. N-Protected amino aldehydes such as 46, 47, and 94 are particularly valuable building blocks, as demonstrated by the syntheses of hypusine (86), deoxyhypusine (85), spermidine (74), and two unsaturated spermidine analogues 81 and 84.
Total syntheses of (+)-hypusine and its (2S,9S)-diastereomer
作者:Raymond J. Bergeron、Michael X. B. Xia、Otto Phanstiel
DOI:10.1021/jo00076a048
日期:1993.11
The total synthesis of (2S,9R)-hypusine dihydrochloride, an unusual amino acid constituent of the eukaryotic translation initiation factor eIF-4D, and its (2S,9S) diastereomer is described. The key step in the syntheses involves the Nepsilon-alkylation of Nepsilon-benzyl-Nalpha-(L)-lysine benzyl ester with (R)- or (S)-epichlorohydrin to give the respective (2S,9R) and (2S,9S) chlorohydrins. Subsequent displacement of the respective chlorides by cyanide ion provides the protected hypusine skeletons. The final step, hydrogenation over PtO2 in AcOH followed by neutralization and reacidification, yielded the respective (2S,9S)- and (2S,9R)-hypusine dihydrochlorides in excess of 50% overall yield.