99553-80-7

Upstream product

• 62107-96-4 rac-2-(4-methylbenzamido)propanoic acid 
• 1155848-57-9 rac-ethyl 2-(4-methylbenzamido)propanoate 
• 874-60-2 4-methyl-benzoyl chloride 

Downstream Products

• 63013-12-7 4,4'-dimethyl-2,2'-di-p-tolyl-4H,4'H-[4,4']bioxazolyl-5,5'-dione 
• 619-55-6 para-methylbenzamide 
• 1423044-77-2 (R)-4-methyl-4-((R)-3-oxo-1-phenylbutyl)-2-(p-tolyl)oxazol-5(4H)-one 

Relevant academic research and scientific papers

Metal-Free Insertion Reactions of Diazo Carbonyls to Azlactones

Insertion reactions of diazo carbonyls to azlactones in basic conditions have been performed. The developed method allows the preparation of a wide range of oxazole derivatives in yields ranging from 74 to 98%. Different substituents on both azlactone rings and diazo carbonyls do not compromise the methodology, even those containing stereogenic centers. Isotopic labeling experiments revealed the mechanism may proceed through a rare diazo carbonyl activation by an ammonium salt derivative.

Group-Assisted Purification Chemistry for Asymmetric Mannich-type Reaction of Chiral N-Phosphonyl Imines with Azlactones Leading to Syntheses of α-Quaternary α,β-Diamino Acid Derivatives ?

An asymmetric Mannich-type reaction between chiral N-phosphonyl imines and azlactones [oxazol-5(4H)-ones] has been established under convenient conditions at room temperature. The reaction was performed without using any bases, additives, or catalysts to achieve up to excellent chemical yields and diastereoselectivity for 32 examples. The α-quaternary syn-α,β-diamino acid products were purified simply by washing the crude mixtures with cosolvents, following the group-assisted purification chemistry/technology, without involving traditional chromatography or recrystallization methods. The auxiliary can be readily removed and recycled for reuse. The absolute configuration was unambiguously assigned by X-ray structural analysis.

Bronsted acid accelerated Pd-catalyzed direct asymmetric allylic alkylation of azlactones with simple allylic alcohols: A practical access to quaternary allylic amino acid derivatives

A Bronsted acid accelerated Pd-catalyzed asymmetric allylic alkylation of azlactones with simple allylic alcohols under mild reaction conditions has been realized, which provides a direct and readily scalable approach for the synthesis of all-carbon quaternary allylic amino acid derivatives in excellent yields and good enantioselectivities. (Chemical Equation Presented).

Bispalladacycle-catalyzed Michael addition of in situ formed azlactones to enones

The development and further evolution of the first catalytic asymmetric conjugate additions of azlactones as activated amino acid derivatives to enones is described. Whereas the first-generation approach started from isolated azlactones, in the second-generation approach the azlactones could be generated in situ starting from racemic N-benzoylated amino acids. The third evolution stage could make use of racemic unprotected α-amino acids to directly form highly enantioenriched and diastereomerically pure masked quaternary amino acid products bearing an additional tertiary stereocenter. The step-economic transformations were accomplished by cooperative activation by using a robust planar chiral bis-Pd catalyst, a Br?nsted acid (HOAc or BzOH; Ac=acetyl, Bz=benzoyl), and a Br?nsted base (NaOAc). In particular the second- and third-generation approaches provide a rapid and divergent access to biologically interesting unnatural quaternary amino acid derivatives from inexpensive bulk chemicals. In that way highly enantioenriched acyclic α-amino acids, α-alkyl proline, and α-alkyl pyroglutamic acid derivatives could be prepared in diastereomerically pure form. In addition, a unique way is presented to prepare diastereomerically pure bicyclic dipeptides in just two steps from unprotected tertiary α-amino acids. Flourishing step economy: The evolution of the catalytic asymmetric addition of azlactones to enones is described. The first-generation approach started from isolated azlactones. In the second-generation approach azlactones could be generated in situ from racemic N-benzoylated amino acids. The third evolution stage could directly use racemic unprotected α-amino acids to form a large number of highly enantioenriched quaternary amino acids derivatives (see figure). Copyright

A simple and convenient synthesis of pyrazinones

Pyrazinones were synthesized by reacting mesoionic azlactone [2-aryl-4-methyl-Δ2-oxaxolin-5-one] and 1,4-diazabutadienes in good yields at room temperature. Copyright Taylor & Francis Group, LLC.

2-Chloro-1,3-dimethylimidazolinium chloride. 2. Its application to the construction of heterocycles through dehydration reactions

2-Chloro-1,3-dimethylimidazolinium chloride (DMC) (1) can act as a powerful dehydrating equivalent to DCC (2) under nearly neutral conditions. Its application to the construction of heterocycles through dehydration reactions is described.

Studies on chromone derivatives : An efficient one-pot synthesis of various 3-( N-aroylamino)-3-methyl-4-(4-oxobenzopyran-3-yl)-1-( N,N-dimethylamino)azetidin-2-ones

Chlorosulfonylmethylene(dimethyl)ammonium chloride 1 is found to be a highly reactive cyclodehydrating agent for the one-pot synthesis of various novel 3-(N-aroylamino)-3-methyl-4-(4-oxobenzopyran-3-yl)-1-(N,N-dimethylamino) azetidin-2-ones 5 from N-aroyl

GENERATION AND FATE OF FREE RADICALS OF Δ2-OXAZOLIN-5-ONES

The reaction of Δ2-oxazolin-5-ones 1a and 1b with nickel peroxid in benzene produces the corresponding 4,4-dehydrodimers 5a and 5b as the main products in yields over 75percent.Under the same conditions, the 2-aryl-4-methyl-Δ2-oxazolin-5-ones 1c, 1d and 1e yield five products.In the case of 1c, the constituents of the product mixture were separated and identified as two 4,4-dehydrodimers (meso and dl pair isomers) 5c and 5c', (40.7percent), 2,4-dehydrodimer 6c (34.9percent), acetylanisoylimide 8c(8.5percent) and anisamide (15.9percent).Adequate mechanistic schemes are discussed to account for the products formed.