34025-29-1

Usage

InChI:InChI=1/C8H8O2/c9-6-8(10)7-4-2-1-3-5-7/h1-6,8,10H

Upstream product

• 93-56-1 phenylethane 1,2-diol 
• 122-78-1 phenylacetaldehyde 
• 100-42-5 styrene 
• 115156-57-5 (2S,4aS,7R,8aR)-2-benzoyl-N-benzyl-4,4,7-trimethyl-octahydro-1,3-benzoxazine 
• 798567-64-3 (1'S,2R)-tert-butyl 2-(1-hydroxy-1-phenylmethyl)benzothiazolidine-3-carboxylate 
• 621-82-9 Cinnamic acid 
• 63-91-2 L-phenylalanine 
• 20780-54-5 (S)-styrene oxide 
• 25779-13-9 (S)-1-phenyl-1,2-ethanediol 
• 83461-64-7 (R)-α-acetoxyphenylacetaldehyde 
• 798567-70-1 (1'R,2R)-tert-butyl 2-(1-hydroxy-1-phenylmethyl)benzothiazolidine-3-carboxylate 
• 186414-27-7 2,2-Dimethyl-propionic acid (2R,4aR,6S,7R,8S,8aR)-7-(2,2-dimethyl-propionyloxy)-2-((R)-hydroxy-phenyl-methyl)-6-methoxy-3-(toluene-4-sulfonyl)-octahydro-pyrano[2,3-e][1,3]oxazin-8-yl ester 
• 186414-21-1 2,2-Dimethyl-propionic acid (2R,4aR,6S,7R,8S,8aR)-2-benzoyl-7-(2,2-dimethyl-propionyloxy)-6-methoxy-3-(toluene-4-sulfonyl)-octahydro-pyrano[2,3-e][1,3]oxazin-8-yl ester 
• 682352-08-5 (1S,2R,3S,5R,2'S)-6,6-dimethyl-3-(2'-ethoxy-1'-phenyl-1'-oxo-2'-ethylsulfanyl)-2-hydroxymethyl-bicyclo[3.1.1]heptane 

Downstream Products

• 78648-24-5 2,5-Bis-acetoxy-3,6-diphenyl-1,4-dioxan 
• 16761-08-3 phenylvinylene carbonate 
• 16355-00-3 (R)-1-phenyl-1,2-ethanediol 
• 25779-13-9 (S)-1-phenyl-1,2-ethanediol 
• 5021-43-2 2-phenylquinoxaline 
• 611-71-2 MANDELIC ACID 
• 17199-29-0 (S)-Mandelic acid 
• 875-74-1 (R)-phenylglycine 
• 2935-35-5 (S)-2-phenylglycine 
• 611-73-4 Benzoylformic acid 
• 611-71-2 (R)-Mandelic Acid 
• 73166-13-9 2,4-diphenyl-morpholine 
• 94559-17-8 2-Benzyliden-1,3-diphenylimidazolidin 
• 90005-59-7 E/Z-mandelaldoxime 

Relevant academic research and scientific papers

Carbanions with two N substituents: Nucleophilic acyl-group-transfer reagents

(Chemical Equation Presented) Without mercury or thallium: A new umpoled nucleophilic acylation reagent is formed in the direct deprotonation of 1,3,5-trimethyl-1,3,5-triazacyclohexane with butyllithium. The carbanionic center is flanked by two amino grou

Two enantiocomplementary ephedrine dehydrogenases from arthrobacter sp. TS-15 with broad substrate specificity

The recently identified pseudoephedrine and ephedrine dehydrogenases (PseDH and EDH, respectively) from Arthrobacter sp. TS-15 are NADH-dependent members of the oxidoreductase superfamily of short-chain dehydrogenases/reductases (SDRs). They are specific for the enantioselective oxidation of (+)-(S) N-(pseudo)ephedrine and (-)-(R) N-(pseudo)ephedrine, respectively. Anti-Prelog stereospecific PseDH and Prelog-specific EDH catalyze the regio- A nd enantiospecific reduction of 1-phenyl-1,2-propanedione to (S)-phenylacetylcarbinol and (R)-phenylacetylcarbinol with full conversion and enantiomeric excess of >99%. Moreover, they perform the reduction of a wide range of aryl-aliphatic carbonyl compounds, including ketoamines, ketoesters, and haloketones, to the corresponding enantiopure alcohols. The highest stability of PseDH and EDH was determined to be at a pH range of 6.0-8.0 and 7.5-8.5, respectively. PseDH was more stable than EDH at 25 °C with half-lives of 279 and 38 h, respectively. However, EDH is more stable at 40 °C with a 2-fold greater half-life than at 25 °C. The crystal structure of the PseDH-NAD+ complex, refined to a resolution of 1.83 ?, revealed a tetrameric structure, which was confirmed by solution studies. A model of the active site in complex with NAD+ and 1-phenyl-1,2-propanedione suggested key roles for S143 and W152 in recognition of the substrate and positioning for the reduction reaction. The wide substrate spectrum of these dehydrogenases, combined with their regio- A nd enantioselectivity, suggests a high potential for the industrial production of valuable chiral compounds.

Thiamine Diphosphate Dependent KdcA-Catalysed Formyl Elongation of Aldehydes

The formose reaction, one of the oldest name reactions in organic chemistry, uses formaldehyde as a C1 unit resulting in different monosaccharides and sugar-like compounds. Nucleophilic formyl elongation is an attractive option to obtain 1,2-fu

One-Pot Enantioselective Synthesis of d-Phenylglycines from Racemic Mandelic Acids, Styrenes, or Biobased l-Phenylalanine via Cascade Biocatalysis

Enantiopure d-phenylglycine and its derivatives are an important group of chiral amino acids with broad applications in thepharmaceutical industry. However, the existing synthetic methods for d-phenylglycine mainly rely on toxic cyanide chemistry and multistep processes. To provide green and safe alternatives, we envisaged cascade biocatalysis for the one-pot synthesis of d-phenylglycine from racemic mandelic acid, styrene, and biobased l-phenylalanine, respectively. Recombinant Escherichia coli (LZ110) was engineered to coexpress four enzymes to catalyze a 3-step reaction in one pot, transforming mandelic acid (210 mM) to give enantiopure d-phenylglycine in 29.5 g L?1 (195 mM) with 93% conversion. Using the same whole-cell catalyst, twelve other d-phenylglycine derivatives were also produced from the corresponding mandelic acid derivatives in high conversion (58–94%) and very high ee (93–99%). E. coli (LZ116) expressing seven enzymes was constructed for the transformation of styrene to enantiopure d-phenylglycine in 80% conversion via a one-pot 6-step cascade biotransformation. Twelve substituted d-phenylglycines were also produced from the corresponding styrene derivatives in high conversion (45–90%) and very high ee (92–99%) via the same cascade reactions. A nine-enzymeexpressing E. coli (LZ143) was engineered to transform biobased l-phenylalanine to enantiopure d-phenylglycine in 83% conversion via a one-pot 8-step transformation. Preparative biotransformations were also demonstrated. The high-yielding synthetic methods use cheap and green reagents (ammonia, glucose, and/or oxygen), and E. coli whole-cell catalysts, thus providing green and useful alternative methods for manufacturing d-phenylglycine. (Figure presented.).

A simple primary amine catalyst for enantioselective α-hydroxylations and α-fluorinations of branched aldehydes

A new primary amine catalyst for the asymmetric α-hydroxylation and α-fluorination of α-branched aldehydes is described. The products of the title transformations are generated in excellent yields with high enantioselectivities. Both processes can be performed within short reaction times and on gram scale. The similarity in results obtained in both reactions, combined with computational evidence, implies a common basis for stereoinduction and the possibility of a general catalytic mechanism for α-functionalizations. Promising initial results in α-amination and α-chlorination reactions support this hypothesis.

Cis-dihydroxylation of alkenes with oxone catalyzed by iron complexes of a macrocyclic tetraaza ligand and reaction mechanism by ESI-MS spectrometry and DFT calculations

[FeIII(L-N4Me2)Cl2]+ (1, L-N4Me2 = N,N′-dimethyl-2,11-diaza[3.3](2,6) pyridinophane) is an active catalyst for cis-dihydroxylation of various types of alkenes with oxone at room temperature using limiting amounts of alkene substrates. In the presence of 0.7 or 3.5 mol % of 1, reactions of electron-rich alkenes, including cyclooctene, styrenes, and linear alkenes, with oxone (2 equiv) for 5 min resulted in up to >99% substrate conversion and afforded cis-diol products in up to 67% yield, with cis-diol/epoxide molar ratio of up to 16.8:1. For electron-deficient alkenes including α,β-unsaturated esters and α,β-unsaturated ketones, their reactions with oxone (2 equiv) catalyzed by 1 (3.5 mol %) for 5 min afforded cis-diols in up to 99% yield with up to >99% substrate conversion. A large-scale cis-dihydroxylation of methyl cinnamate (9.7 g) with oxone (1 equiv) afforded the cis-diol product (8.4 g) in 84% yield with 85% substrate conversion. After catalysis, the L-N4Me2 ligand released due to demetalation can be reused to react with newly added Fe(ClO4)2?4H2O to generate an iron catalyst in situ, which could be used to restart the catalytic alkene cis-dihydroxylation. Mechanistic studies by ESI-MS, isotope labeling studies, and DFT calculations on the 1-catalyzed cis-dihydroxylation of dimethyl fumarate with oxone reveal possible involvement of cis-HO-Fe V O and/or cis-O FeV O species in the reaction; the cis-dihydroxylation reactions involving cis-HO-FeV O and cis-O FeV O species both proceed by a concerted but highly asynchronous mechanism, with that involving cis-HO-FeV O being more favorable due to a smaller activation barrier.

Diastereoselective reduction of chiral N-tosyl-2-benzoyl-1,3-oxazine derived from (1R)-(+)-camphor

The stereochemistry of reduction of chiral N-tosyl-2-benzoyl-1,3-oxazine prepared by condensation of 1,3-amino alcohol derived from (1R)-(+)-camphor with phenylglyoxal was investigated using various reducing agents. Based on X-ray crystallography, 2-benzoyl group in 1,3-oxazine ring was situated in the axial position. High diastereoselectivity observed in the hydride reduction can be explained by a chelate model where N-tosyl oxygen atom takes part in chelation rather than ring oxygen atom. The Japan Institute of Heterocyclic Chemistry.

Influence of α-methyl substitution of proline-based organocatalysts on the asymmetric α-oxidation of aldehydes

The direct asymmetric organocatalytic α-oxidation of aldehydes using trans-2-(p-methylphenylsulfonyl)-3-phenyloxaziridine is reported. This method affords the S isomer of α-hydroxy aldehydes, thereby complementing the selectivity for the R isomer observed using the two-step nitrosobenzene method. Use of α-methylproline and α-methylproline tetrazole significantly increases the enantioselectivity observed for the α-oxidation of aldehydes compared to analogous unsubstituted organocatalysts.

Asymmetric 1,4-dihydroxylation of 1,3-dienes by catalytic enantioselective diboration

(Chemical Equation Presented) Asymmetric 1,4-dihydroxylations of 1,3-dienes, and other transformations, are initiated by the Pt-catalyzed enantioselective addition of bis(pinacolato)diboron (B2(pin) 2) to conjugated dienes. The studies reported in this communication suggest that both cyclic and acyclic substrates will participate in this reaction; however, dienes which are unable to adopt the S-cis conformation are unreactive. For most substrates, 1,4-addition is the predominant pathway. In addition to oxidation to the derived 2-buten-1,4-diol, stereoselective carbonyl allylation with the intermediate bis(boronate) ester is also described.

Asymmetric induction through metalation of chiral dithioacetals and oxathioacetals

The work presented in this article consists of synthesis of chiral dithioacetals and oxathioacetals using pure chiral auxiliaries, such as, (+) camphor, (-) menthol, and L-cysteine. Metalation of these chiral dithioacetals and oxathioacetals, followed by nucleophilic addition to benzaldehyde and removal of chiral auxiliary, furnished scalemic mandelic acid with various enantiomeric purities. Copyright Taylor & Francis Group, LLC.