401792-80-1

Upstream product

• 1006364-86-8 methyl 1-benzyloxy-5-methyl-6-oxo-1,2,3,6-tetrahydropyridine-2-carboxylate 
• 29681-38-7 methyl 5-methylpyridine-2-carboxylate 
• 589-93-5 2,5-dimethylpyridine 
• 4434-13-3 2-carboxy-5-methylpyridine 
• 401792-77-6 methyl 5-methyl-2-pyridinecarboxylate N-oxide 

Downstream Products

• 401792-82-3 methyl 6-methoxy-5-methyl-2-pyridinecarboxylate 
• 401792-87-8 methyl 5-formyl-6-methoxy-2-pyridinecarboxylate 
• 401792-93-6 (+)-methyl N-(benzyloxycarbonyl)-3-[2-(methoxycarbonyl)-6-methoxy-5-pyridinyl]-L-alaninate 
• 478946-91-7 5-((S)-2-Benzyloxycarbonylamino-2-carboxy-ethyl)-6-methoxy-pyridine-2-carboxylic acid 

Relevant academic research and scientific papers

Ring-closing metathesis for the synthesis of heteroaromatics: evaluating routes to pyridines and pyridazines

Ring-closing olefin metathesis (RCM) has been applied to the efficient synthesis of densely and diversely substituted pyridine and pyridazine frameworks. Routes to suitable metathesis precursors have been investigated and the scope of the metathesis step has been probed. The metathesis products function as precursors to the target heteroaromatic structures via elimination of a suitable leaving group, which also facilitates earlier steps by serving as a protecting group at nitrogen. Further functionalisation of the metathesis products is possible both prior to and after aromatisation. The net result is a powerful strategy for the de novo synthesis of highly substituted heteroaromatic scaffolds.

A metathesis-based approach to the synthesis of 2-pyridones and pyridines

(Chemical Equation Presented) The ring-closing metathesis reaction has been successfully employed to form a range of dihydropyridone intermediates, which are in the correct oxidation state to undergo a base-induced elimination to reveal the aromatic 2-pyridone. This mild and novel approach to six-membered heteroaromatic compounds then provides access to a wide variety of substituted pyridines in excellent overall yield.

Nonproteinogenic amino acids: An efficient asymmetric synthesis of (S)-(-)-acromelobic acid and (S)-(-)-acromelobinic acid

An efficient synthesis of (S)-(-)-acromelobic acid (1) and (S)-(-)-acromelobinic acid (2) is described via asymmetric hydrogenation protocol. Asymmetric hydrogenation of dehydroamino acid derivative 23 using (R,R)-[Rh(DIPAMP)(COD)]BF4 catalyst followed by removal of the protective groups afforded (S)-(-)-acromelobic acid (1) in >98% ee. The key intermediate 23 was prepared from citrazinic acid (8). The dehydroamino acid derivative 33 required for the synthesis of (S)-(-)-2 was prepared from 2,5-lutidine (27), which upon hydrogenation using (S,S)-[Rh(Et-DuPHOS)(COD)]BF4 catalyst afforded (S)-(+)-34 in 93% yield and >96% ee. Removal of protective groups in (S)-(+)-34 afforded (S)-(-)-acromelobinic acid (2) in good overall yield.

Asymmetric synthesis of (S)-(-)-acromelobinic acid

A total synthesis of (S)-(-)-acromelobinic acid 2, which was isolated from clitocybe acromelalga, was achieved via an asymmetric hydrogenation protocol. Dehydroamino acid derivative 12 was prepared from 2,5-lutidine 5 and subjected to asymmetric hydrogenation using (S,S)-[Rh(Et-DuPHOS)(COD)]BF4 to give the (S)-(+)-pyridylalanine derivative 13 in 93% yield and >96% e.e. Removal of the protecting groups in (S)-(+)-13 afforded (S)-(-)-acromelobinic acid 2.