117833-92-8Relevant articles and documents
Solution-phase automated synthesis of an α-amino aldehyde as a versatile intermediate
Masui, Hisashi,Yosugi, Sae,Fuse, Shinichiro,Takahashi, Takashi
supporting information, p. 106 - 110 (2017/02/15)
A solution-phase automated synthesis of the versatile synthetic intermediate, Garner's aldehyde, was demonstrated. tert-Butoxycarbonyl (Boc) protection, acetal formation, and reduction of the ester to the corresponding aldehyde were performed utilizing our originally developed automated synthesizer, ChemKonzert. The developed procedure was also useful for the synthesis of Garner's aldehyde analogues possessing fluorenylmethyloxycarbonyl (Fmoc) or benzyloxycarbonyl (Cbz) protection.
Diastereocontrolled multicomponent pathway to 3,4-heterocycle-annulated tetrahydro-β-carbolines
Dardennes, Emmanuel,Kovacs-Kulyassa, Arpad,Boisbrun, Michel,Petermann, Christian,Laronze, Jean-Yves,Sapi, Janos
, p. 1329 - 1339 (2007/10/03)
A diastereoselective synthesis, using the Yonemitsu-type trimolecular condensation as the key step, has been used for the preparation of 3,4-heterocycle(furanone-, pyrrolidinone- and pyranone-) annulated tetrahydro-β-carbolines. The chirality of D-gly-cer
Synthesis and growth inhibitory activity of chiral 5-hydroxy-2-N-acyl-(3E)-sphingenines: Ceramides with an unusual sphingoid backbone
Chun, Jiong,Byun, Hoe-Sup,Arthur, Gilbert,Bittman, Robert
, p. 355 - 359 (2007/10/03)
The unusual sphingoid base 5-hydroxy-3-sphingenine was identified in the hydrolysate of brain sphingolipids more than 40 years ago. We present here the first synthesis of the 5R and 5S diastereoisomers of the N-acyl derivatives of 5-hydroxy-3-sphingenine, 2 and 3, respectively, which represent regioisomers of (2S,3R)-ceramide (1). The key steps include the synthesis of a,β-unsaturated ketone intermediates 4 and 5 from N-Cbz- and N-Boc -L-serine and diastereoselective reduction of the enones. The configuration at the new carbinol center was deduced by proton NMR analysis of (R)- and (S)-Mosher [methoxy(trifluoromethyl)phenylacetate] ester derivatives. Ceramide analogues 2 and 3 showed a markedly higher antiproliferative activity than 1 on MCF-7 cells.
Homochiral 4-azalysine building blocks: Syntheses and applications in solid-phase chemistry
Chhabra, Siri Ram,Mahajan, Anju,Chan, Weng C.
, p. 4017 - 4029 (2007/10/03)
Anomalous amino acids not only play central roles as mimics of natural amino acids but also offer opportunities as unique building blocks for combinatorial chemistry. This paper describes the chiral syntheses and solid-phase applications of a versatile atypical amino acid, 4-azalysine (2,6-diamino-4-azahexanoic acid) 1. The syntheses of differentially protected 4-azalysine derivatives 28a-e have been developed by two efficient and inexpensive routes that start either from Garner's aldehyde 16 or the chiron (S)-Nα-Cbz-2,3-diaminopropionic acid 23. Both approaches employ the convergent modular concept and exploit reductive amination of aldehydes with amines as the key step for the fusion of the two segments. In the first route, the overall process inverts the chirality of the starting material, L-serine, and thus provides an excellent route to the unnatural D-isomers. The alternative route starting from L-asparagine provides a shorter and high-yielding route to orthogonally protected 4-azalysine derivatives. The corresponding N2-Fmoc-4-azalysines 31a-e, readily derived from the key intermediate 27, are compatible with the Fmoc-based solid-phase peptide synthesis (SPPS) and solid-phase organic chemistry (SPOC) protocols. Furthermore, the utility and versatility of another key structure, tris-Boc-4-azalysine 2 in the engineering of novel high-loading dendrimeric polystyrene resins 33 and 36, have been demonstrated. Following derivatization with the Rink amide linker 34, the stability and robustness of these resin-bound dendrimers 35 and 37 in the synthesis of small molecules using a range of reaction conditions (e.g., Mitsunobu and Suzuki reactions) have been effectively illustrated.
Enantiomerically pure α-amino acid synthesis via hydroboration - Suzuki cross-coupling
Collier, Philip N.,Campbell, Andrew D.,Patel, Ian,Raynham, Tony M.,Taylor, Richard J. K.
, p. 1802 - 1815 (2007/10/03)
The Garner aldehyde-derived methylene alkene 5 and the corresponding benzyloxycarbonyl compound 25 undergo hydroboration with 9-BBN-H followed by palladium-catalyzed Suzuki coupling reactions with aryl and vinyl halides. After one-pot hydrolysis -oxidation, a range of known and novel nonproteinogenic amino acids were isolated as their N-protected derivatives. These novel organoborane homoalanine anion equivalents are generated and transformed under mild conditions and with wide functional group tolerance: electron-rich and -poor aromatic iodides and bromides (and a vinyl bromide) all undergo efficient Suzuki coupling. The extension of this methodology to prepare meso-DAP, R,R-DAP, and R,R-DAS is also described.
A synthetic azinomycin analogue with demonstrated DNA cross-linking activity: Insights into the mechanism of action of this class of antitumor agent
Hartley, John A.,Hazrati, Ali,Kelland, Lloyd R.,Khanim, Ruzwana,Shipman, Michael,Suzenet, Franck,Walker, Louise F.
, p. 3467 - 3470 (2007/10/03)
An efficient synthesis of simplified azinomycin A and B analogues 1 and 2 (see picture) is described, and it is demonstrated that only 1, bearing both the epoxide and aziridine, induces interstrand cross-links in double-stranded DNA. Remarkably, a compoun
An alkylidene carbene C-H insertion strategy for the enantioselective synthesis of α,α-dialkyl-α-amino acids
Gabaitsekgosi, Renameditswe,Hayes, Christopher J.
, p. 7713 - 7716 (2007/10/03)
A synthesis of the α,α-dialkyl-α-amino acid (1S,3R)-2,5-methano-leucine has been achieved using an alkylidene carbene 1,5-C-H insertion reaction as a key step. Treatment of the ketone 11 with 1.2 equivalents of lithio(trimethylsilyl)diazomethane in THF resulted in the formation of the cyclopentene 13 in 62% yield. The enantiomeric excess of the product 18 was determined to be >95% by chiral HPLC (Chiracel OD column).
Stereoselective synthesis of differentially protected derivatives of the higher amino sugars destomic acid and lincosamine from serine and threonine
Marshall, James A.,Beaudoin, Serge
, p. 581 - 586 (2007/10/03)
The aminoheptose destomic acid (3.5) and the aminooctose lincosamine (6.8) were synthesized in protected form by parallel sequences starting from the oxazolidine derivatives 2.4 and 5.1 of N-CBz serinal and N-BOC threoninal. The parallel sequences feature
Synthesis of 2-isoxazoline and α-hydroxy ketomethylene dipeptide isosteres
Chung, Yong Jun,Ryu, Eun Jung,Keum, Gyochang,Kim, Byeang Hyean
, p. 209 - 225 (2007/10/03)
We have developed a simple and stereoselective method for synthesizing novel dipeptide isosteres using nitrile oxide cycloaddition as a key reaction. Employing this method, we have prepared efficiently various peptidomimetics containing 2-isoxazolines and
New Synthetic Methodology for the Synthesis of 7-Substituted Tetrahydroazepin-2-ones
Evans, P. Andrew,Holmes, Andrew B.,Russell, Keith
, p. 3397 - 3410 (2007/10/02)
The Claisen rearrangement of the vinyl substituted ketene aminals 2 (R = CH2CHMe2, CH2OSit-BuMe2) which were generated in situ by selenoxide elimination of the aminal precursors 3 in the presence of 1,8-diazabicycloundec-7-ene (DBU) furnished the enantiomerically pure 7-substituted tetrahydroazepin-2-ones 1.