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A chiral bifuntional thiourea catalyzed diastereo- and enantioselective Michael addition followed by an intramolecular Aldol reaction of 3-indolinone-2-carboxylates with cyclohexenone has been accomplished using a chiral thiourea catalyst. It is a novel strategy for the construction of chiral bridged tricyclic hydrocarbazole derivatives bearing four contiguous stereocenters with excellent diastereo- and enantioselectivity.
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Name: Organic letters
The reaction of 3-cyanophthalides with allene carboxylates in the presence of tBuOLi results in a tandem annulation furnishing naphtho[b]furanones in good yields with no loss of carbon. The carbon eco...
The copper-catalyzed asymmetric [3 + 3] annulation of ethynyl benzoxazinanones with pyrazolones has been achieved, providing simple access to 1,4-dihydropyrano[2,3- c]pyrazole derivatives in moderate ...
The first asymmetric decarboxylative [4 + 3] annulation of propargylic carbamates with C, N-cyclic azomethine imines has been developed successfully by a copper- N-heterocyclic carbine system. This st...
An asymmetric cascade reaction between β-keto acylpyrazoles and o-quinone methides in a formal [4 + 2] fashion to access potentially pharmacological active trans-3,4-dihydrocoumarins has been achieve...
Herein we have demonstrated the first report on 5-annulation of ketoimines to valuable isoindolinone-3-carboxylates. Instead of commonly used aldimine substrates, relatively less reactive ketoimines a...
The purpose of this study is to evaluate safety and efficacy of corneal cross-linking and photorefractive keratectomy for refractive correction in patients with bilateral asymmetric topogr...
The purpose of this study is to evaluate the effect of asymmetric spinal stabilization exercise on scoliosis
This study will assess changes in visual acuity and corneal symmetry after corneal collagen cross-linking (CXL) of asymmetric corneas.
The aim of the study is to identify the role of diffusion weighted MRI in the assessment of the clinical significance and outcomes of asymmetric breast densities identified on mammograms, ...
This longitudinal study evaluates the possible benefit of cochlear implantation in the poor ear of adults with asymmetric hearing loss who continue to use a hearing aid in the better heari...
An Act that amends Title XVIII of the Social Security Act to repeal the Medicare sustainable growth rate, that strengthens Medicare access by improving physician payments, and that reauthorizes the Children's Health Insurance Program (CHIP).
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A carboxylating enzyme that catalyzes the conversion of ATP, acetyl-CoA, and HCO3- to ADP, orthophosphate, and malonyl-CoA. It is a biotinyl-protein that also catalyzes transcarboxylation. The plant enzyme also carboxylates propanoyl-CoA and butanoyl-CoA (From Enzyme Nomenclature, 1992) EC 184.108.40.206.
Supramolecular networks that consist of ordered arrangements of organic electron donor linkers (usually ditopic or polytopic organic carboxylates) and metal cations. They can have an extremely high surface area and adjustable pore size that allows for the insertion of other molecules capable of various functions such as catalysis, capture of carbon dioxide, and drug delivery.
Enzymes that catalyze inversion of the configuration around an asymmetric carbon in a substrate having one (racemase) or more (epimerase) center(s) of asymmetry. (Dorland, 28th ed) EC 5.1.