35719-57-4

Upstream product

• 76637-59-7 (1S,4S)-2-Amino-bicyclo[2.2.1]hept-5-ene-2-carboxylic acid 
• 72431-82-4 methyl 2-endo-acetamidobicyclo<2.2.1>hept-5-ene-2-exo-carboxylate 
• 6203-08-3 methyl bicyclo[2.2.1]hept-5-ene-2-carboxylate 
• 72431-82-4 methyl 2-exo-acetamidobicyclo<2.2.1>hept-5-ene-2-endo-carboxylate 
• 131053-12-8 (-)-menthyl 2-exo-acetamidobicyclo<2.2.1>hept-5-ene-2-endo-carboxylate 
• 131053-13-9 2-exo-acetamidobicyclo<2.2.1>hept-5-ene-2-endo-carboxylic acid 
• 278175-34-1 (1S,2R,4S,6'S)-bicyclo[2.2.1]hept-5-en-2-spiro{3[6'-isopropyl-5'-phenyl-3',6'-dihydro-2'H-1',4'-oxazin-2'-one]} 

Relevant academic research and scientific papers

New and facile synthesis of aminobicyclo[22.1]heptane-2-carboxylic acids

Abstract A facile approach for the stereoselective synthesis of a- and b-2-aminobicyclo[2.2.1]heptane-2-carboxylic acid is described. Substrate-controlled α-carboxylation of norbonene monoester delivered the asymmetric diester intermediate with high diastereoselectivity (up to 35:1). Sequential chemoselective ester cleavage, Curtius rearrangement, and hydrolysis gave the a- and b-isomers of 2-aminobicyclo[2.2.1]heptane-2-carboxylic acid, respectively.

New Chiral Didehydroamino Acid Derivatives from a Cyclic Glycine Template with 3,6-Dihydro-2H-1,4-oxazin-2-one Structure: Applications to the Asymmetric Synthesis of Nonproteinogenic α-Amino Acids

New chiral (Z)-α,β-didehydroamino acid (DDAA) derivatives with 3,5-dihydro-2H-1,4-oxazin-2-one structure 11a-f have been stereoselectively prepared after condensation of chiral glycine equivalent 7 with aldehydes in the presence of K2CO3 under mild solid-liquid phase-transfer catalysis reaction conditions. These new systems have been used in diastereoselective cyclopropanation reactions using Corey's ylide for the asymmetric synthesis of 1-aminocyclopropane-1-carboxylic acids (ACCs) such as allo-corononamic and allo-norcoronamic acids. The hydrogenation reaction of these systems at ambient pressure in the presence of formaldehyde affords saturated oxazinones and N-methylated oxazinones which have been transformed into the N-methyl-α-amino acids (N-MAAs) (S)-2-(methylamino)butanoic acid and (S)-N-methylleucine. In addition, the parent α,β-didehydroalanine derivative 11g has been prepared by a direct aminomethylation-elimination sequence from 7 and Eschenmoser's salt and has been used in Diels-Alder cycloaddition with endo selectivity for the synthesis of the enantiomerically pure bicyclic α-amino acids (-)-2-aminobicyclo[2.2.1]heptane-2-carboxylic and (-)-2-aminobicyclo[2.2.2]octane-2-carboxylic acids.

N-Fmoc-dehydroalanine: A versatile molecular scaffold for the rapid solid-phase synthesis of cycloaliphatic amino acids

The synthesis of polymer-supported N-Fmoc-dehydroalanine starting from S-protected cysteine via an oxidation/elimination strategy is described. Cycloaddition with a range of dienes afforded a range of conformationally constrained amino acids in moderate yields. The potential applications of this methodology to combinatorial libraries is discussed. (C) 2000 Elsevier Science Ltd.

Chiral (Z)-α,β-didehydroamino acid derivatives from a new chiral glycine equivalent with a 1,2,3,6-tetrahydropyrazin-2-one structure: Applications to the synthesis of 1-aminocyclopropanecarboxylic acids and bicyclic α-amino acids

The new chiral glycine equivalent 9, easily obtained from (+)-α-aminoisovalerophenone and glycine, afforded chiral (Z)-α,β-didehydroamino acid (DDAA) derivatives 13 and 14 with a 1,2,3,6-tetrahydropyrazin-2-one structure. Compounds 13 and 14 were synthesised by reaction of 9 with Eschenmoser's salt and by condensation reactions with aldehydes or acetone under PTC conditions, respectively. The diastereoselective cyclopropanation of 14, followed by hydrolysis, furnished (-)-allo-norcoronamic acid with high ee, whilst diastereoselective Diels-Alder reaction of dienophile 13 and cyclopentadiene afforded, after double bond hydrogenation and hydrolysis, (-)-2-aminonorbornane-2-carboxylic acid. Copyright (C) 2000 Elsevier Science Ltd.

Asymmetric synthesis of bicyclic α-amino acids by a Diels-Alder reaction to a new chiral α,β-didehydroalanine derivative

A new chiral cyclic α,β-didehydroalanine derivative, (6S)-6-isopropyl- 3-methylene-5-phenyl-3,6-dihydro-2H-1,4-oxazin-2-one, has been prepared by in situ aminomethylation-elimination of a chiral glycine-derived precursor. This oxazin-2-one acts as a react

ASYMMETRIC SYNTHESIS OF CYCLOALIPHATIC α-AMINO ACIDS WITH A NORBORNANE SKELETON

The asymmetric synthesis of endo and exo 2-aminonorbornane-2-carboxylic acids is carried out via the Diels-Alder reaction between cyclopentadiene and (-)-menthyl N-acetyl-α,β-dehydroalaninate.It is shown that this dienophile is more reactive than the corresponding methyl ester, which opens the way for the use of chiral N-acetyl-α,β-dehydroalaninates as dienophiles in asymmetric Diels-Alder reactions.As high diastereofacial selectivity is obtained with what was previously considered a mediocre chiral auxiliary, the acetamido group must play an important role, which is discussed.

A SYNTHESIS OF 2-AMINONORBORNENE-2-CARBOXYLIC ACID DERIVATIVES BY DIELS-ALDER REACTION USING α,β-DEHYDROALANINATES AS A DIENOPHILE

The Diels-Alder reaction of N-acyl-α,β-dehydroalanine esters with cyclopentadiene afforded a mixture of the stereoisomers of acylaminonorbornene-2-carboxylic acid esters in good yields.