373368-82-2

Basic information

• Product Name: HO-D-Hpla(Bn)-D-Leu-L-Choi-L-Arg(NO₂)-OMe
• Synonyms: HO-D-Hpla(Bn)-D-Leu-L-Choi-L-Arg(NO₂)-OMe
• CAS NO: 373368-82-2
• Molecular Weight: 767.88
• Mol File: 373368-82-2.mol

Chemical Properties

• CAS DataBase Reference: HO-D-Hpla(Bn)-D-Leu-L-Choi-L-Arg(NO₂)-OMe(CAS DataBase Reference)
• NIST Chemistry Reference: HO-D-Hpla(Bn)-D-Leu-L-Choi-L-Arg(NO₂)-OMe(373368-82-2)
• EPA Substance Registry System: HO-D-Hpla(Bn)-D-Leu-L-Choi-L-Arg(NO₂)-OMe(373368-82-2)

Safety Data

• Hazardous Substances Data: 373368-82-2(Hazardous Substances Data)

Upstream product

• 313952-07-7 AcO-D-Hpla(Bn)-D-Leu-L-Choi-OMe 
• 313952-14-6 Boc-D-Leu-L-Choi-OMe 
• 313952-04-4 methyl (2S,3aS,6R,7aS)-1-tert-butoxycarbonyl-6-hydroxy-octahydroindole-2-carboxylate 
• 313952-03-3 Methyl (2S,3aS,7aS)-1-tert-butoxycarbonyl-6-oxo-octahydroindole-2-carboxylate 
• 373368-56-0 Methyl (2S,3aS,6R,7aS)-6-hydroxy-octahydroindole-2-carboxylate 
• 181649-60-5 methyl (2S,3aS,7aS)-1-benzyl-6-oxo-octahydroindole-2-carboxylate 
• 181649-56-9 methyl (2S,3aR,7aR)-1-benzyl-6-oxo-octahydroindole-2-carboxylate 
• 16937-99-8 N-Boc-D-Leu 
• 51298-62-5 nitro-L-arginine methyl ester hydrochloride 
• 313952-15-7 HO-D-Hpla(Bn)-D-Leu-L-Choi-OH 

Downstream Products

• 373368-84-4 D-Hpla(Bn)-D-Leu-L-Choi-L-Argol(NO₂) 

Relevant articles and documents

First total syntheses of aeruginosin 298-A and aeruginosin 298-B, based on a stereocontrolled route to the new amino acid 6-hydroxyoctahydroindole-2-carboxylic acid

The first total syntheses of aeruginosin 298-A (1) and aeruginosin 298-B (3) are described. The syntheses of the alternative putative structures 2 and 4 were also accomplished. The key common strategic element is the stereocontrolled synthesis of (2S,3aS,6R,7aS)-6-hydroxyoctahydroindole-2-carboxylic acid (L-Choi, 5) from L-tyrosine. The synthesis of this new bicyclic α-amino acid, which is the core of aeruginosins, involves Birch reduction of O-methyl-L-tyrosine (6) and aminocyclization of the resulting dihydroanisole 7 in acid medium, followed by N-benzylation to give the diastereoisomers 12 and 13. Upon acid treatment with HCl-MeOH, the last two produce an equilibrium mixture in which the endo isomer 13 significantly predominates. Hydrogenation of 13 in the presence of (Boc)2O gives 16, which on reduction with LS-Selectride furnishes the alcohol 22, a protected L-Choi. Successive couplings of 22 with D-leucine, protected (R)-(4-hydroxyphenyl)lactic acid, and L-arginine fragments, followed by reduction to the argininol level and a deprotection end step complete the synthetic sequence to produce aeruginosin 298-A (1). Spectral comparison showed that peptide 2, with the structure previously proposed for aeruginosin 298-A, was different from the natural product. However, synthetic 1 was found to be identical to the isolated natural sample of aeruginosin 298-A. These results unequivocally establish that the absolute stereochemistry of aeruginosin 298-A, formerly assigned incorrectly, is D-Hpla-D-Leu-L-Choi-L-Argol, as shown by structure 1. Aeruginosin 298-B was also synthesized and shown to be a mixture of rotamers of D-Hpla-D-Leu-L-ChoiNH2 (3), rather than an epimeric mixture of 3 and the L-Leu-incorporating 4.