50415-84-4

Upstream product

• 591-50-4 iodobenzene 
• 917-54-4 methyllithium 
• 922-67-8 propynoic acid methyl ester 
• 67-56-1 methanol 
• 201230-82-2 carbon monoxide 
• 50415-85-5 (E)-benzeneacetic acid, α-ethylidene, methyl ester 
• 30953-25-4 2-phenylbut-3-enoic acid 
• 17642-18-1 (E)-α-bromocrotonate de methyle 
• 960-16-7 tributylphenylstannane 
• 1188274-63-6 methyl (Z)-2-phenyl-3-(p-toluenesulfonyloxy)prop-2-enoate 
• 75-16-1 methylmagnesium bromide 
• 15206-55-0 methyl 2-oxo-2-phenylacetate 
• 1530-32-1 ethyltriphenylphosphonium bromide 
• 101-41-7 benzeneacetic acid methyl ester 

Relevant academic research and scientific papers

Catalytic, contra-Thermodynamic Positional Alkene Isomerization

The positional isomerization of C═C double bonds is a powerful strategy for the interconversion of alkene regioisomers. However, existing methods provide access to thermodynamically more stable isomers from less stable starting materials. Here, we report

Electrochemical oxidative: Z -selective C(sp2)-H chlorination of acrylamides

An electrochemical method for the oxidative Z-selective C(sp2)-H chlorination of acrylamides has been developed. This catalyst and organic oxidant free method is applicable across various substituted tertiary acrylamides, and provides access to a broad range of synthetically useful Z-β-chloroacrylamides in good yields (22 examples, 73% average yield). The orthogonal derivatization of the products was demonstrated through chemoselective transformations and the electrochemical process was performed on gram scale in flow.

Photocatalytic Hydromethylation and Hydroalkylation of Olefins Enabled by Titanium Dioxide Mediated Decarboxylation

A versatile method for the hydromethylation and hydroalkylation of alkenes at room temperature is achieved by using the photooxidative redox capacity of the valence band of anatase titanium dioxide (TiO2). Mechanistic studies support a radical-based mechanism involving the photoexcitation of TiO2 with 390 nm light in the presence of acetic acid and other carboxylic acids to generate methyl and alkyl radicals, respectively, without the need for stoichiometric base. This protocol is accepting of a broad scope of alkene and carboxylic acids, including challenging ones that produce highly reactive primary alkyl radicals and those containing functional groups that are susceptible to nucleophilic substitution such as alkyl halides. This methodology highlights the utility of using heterogeneous semiconductor photocatalysts such as TiO2 for promoting challenging organic syntheses that rely on highly reactive intermediates.

Tandem Remote Csp3-H Activation/Csp3-Csp3 Cleavage in Unstrained Aliphatic Chains Assisted by Palladium(II)

We report here a proof-of-concept for the cleavage of unstrained remote Csp3-Csp3 bonds at room temperature assisted by a directing group, opening up new possibilities to use aliphatic carboxylic acids as suitable alkenyl coupling partners. This strategy involves the Pd-mediated Csp3-H activation directed by a tethered 8-aminoquinoline group, followed by a concerted asynchronous carbene insertion into the Pd-C bond, and an unexpected β-carbon-carbon bond splitting. The insertion of a coupling partner into a Pd-C bond is a novel route to promote C-C bond cleavage, which in contrast to most common methodologies does not rely on the use of strained carbocycles.

Enantioselective Hydrogen Atom Transfer: Discovery of Catalytic Promiscuity in Flavin-Dependent 'Ene'-Reductases

Flavin has long been known to function as a single electron reductant in biological settings, but this reactivity has rarely been observed with flavoproteins used in organic synthesis. Here we describe the discovery of an enantioselective radical dehalogenation pathway for α-bromoesters using flavin-dependent 'ene'-reductases. Mechanistic experiments support the role of flavin hydroquinone as a single electron reductant, flavin semiquinone as the hydrogen atom source, and the enzyme as the source of chirality.

Mild, efficient, and robust method for stereocomplementary iron-catalyzed cross-coupling using (E)- and (Z)-enol tosylates

Iron-catalyzed cross-coupling of Grignard reagents (RMgX) with (E)- and (Z)-enol tosylates proceeded smoothly to give a variety of the corresponding (E)- and (Z)-trisubstituted ,-unsaturated methyl esters (total 30 examples; 55-98% yield). The simple, mild, stereoretentive method utilized iron(III) chloride (FeCl3), iron(III) acetylacetonate [Fe(acac)3], and iron(III) tris(dibenzylmethane) [Fe(dbm). The (E)- and (Z)-enol tosylates were readily prepared by the reported stereocomplementary tosylation method from methyl -keto esters or -formyl esters. Methyl -formyl esters were obtained via a practical and robust TiCl4-Et3N-mediated -formylation of methyl esters with methyl formate.

Synthesis of a new family of 2-ethylidene-γ-unsaturated δ-amino esters via microwave activated Stille coupling

A simple approach to a new family of enantiomerically enriched polyunsaturated t-Boc-protected-δ-amino esters is described, via microwave promoted Stille coupling of (Z)-methyl-2-bromobutenoate with stannylated allylamines. The reaction conditions are mild and selective and disclose a simple way to 1-substituted butenoates of defined geometry.

Chiral amino ether-controlled catalytic enantioselective arylthiol conjugate additions to α,β-unsaturated esters and ketones: Scope, structural requirements, and mechanistic implications

Asymmetric conjugate addition reaction of 2-trimethylsilylbenzenethiol with enoates and enones is catalyzed by a chiral amino ether-lithium thiolate complex and affords adducts with high enantioselectivity. Both the s-cis conformation and a steric wall at one side of the carbonyl group are structural requirements in substrates yielding adducts with high enantioselectivity. Reactions with tert-butyl enones gave addition products with high enantioselectivity. Construction of two contiguous chiral centers was possible by this addition-protonation sequence. Methyl tiglate was stereoselectively converted to a single syn-adduct of 95% enantiomeric excess (ee) bearing two contiguous chiral centers. Methyl 2-phenyl-2-butenoate was converted to a single syn-adduct of 95% ee, which was desulfurized to methyl 2-phenylbutanoate of 95% ee. These additions generate a transient lithium enolate that is protonated by a thiol anti to the C-S bond, giving the corresponding product having two adjacent stereocenters.

W(CO)6 Mediated C-S Bond Cleavage Reactions

W(CO)6-mediated reactions of thioethers in refluxing chlorobenzene yielded mainly the corresponding dimers.Optically active thioethers give the respective racemic products.Mercaptans, on the other hand, predominantly afford the corresponding reduced products.A deuterium labeling experiments suggest that the SH group is the hydrogen source in the latter reduction reactions.A free-radical mechanism is suggested.