Browse
Submit Data
Databases
API
Help

Dataset Information

29 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Improved method for the synthesis of beta-carbonyl silyl-1,3-dithianes by the double conjugate addition of 1,3-dithiol to propargylic carbonyl compounds.

ABSTRACT: Base-mediated double conjugate addition of 1,3-propane dithiol to various silylated propargylic aldehydes and ketones allows for an efficient and scalable synthesis of beta-carbonyl silyl-1,3-dithianes.

SUBMITTER: Mukherjee S

PROVIDER: S-EPMC2787704 | biostudies-literature | 2009 Dec

REPOSITORIES: biostudies-literature

ACCESS DATA

Json Xml

Publications

Improved method for the synthesis of beta-carbonyl silyl-1,3-dithianes by the double conjugate addition of 1,3-dithiol to propargylic carbonyl compounds.

Mukherjee Sumit S Kontokosta Dimitra D Patil Aditi A Rallapalli Sivakumar S Lee Daesung D

The Journal of organic chemistry 20091201 23

Base-mediated double conjugate addition of 1,3-propane dithiol to various silylated propargylic aldehydes and ketones allows for an efficient and scalable synthesis of beta-carbonyl silyl-1,3-dithianes. ...[more]

PMID: 19877611

Similar Datasets

Dynamic thiol exchange with ?-sulfido-?,?-unsaturated carbonyl compounds and dithianes.

Project description:A reversible covalent bond exchange of thiols, ?-sulfido-?,?-unsaturated carbonyls, and dithianes has been studied in DMSO and D(2)O/DMSO mixtures. The equilibrium between thiols and ?-sulfido-?,?-unsaturated carbonyls is obtained within a few hours, while the equilibration starting with the ?-dithiane carbonyls and thiols requires a few days. This time scale makes the system ideal for utilization in dynamic combinatorial chemistry.

| S-EPMC3472802 | biostudies-literature

Tetrasubstituted olefins through the stereoselective catalytic intermolecular conjugate addition of simple alkenes to α,β-unsaturated carbonyl compounds.

Project description: Not available

| S-EPMC3869203 | biostudies-literature

2,5-Bis(1,3-dithiol-2-yl-idene)-1,3-dithiol-ane-4-thione.

Project description:The asymmetric unit of the title compound, C(9)H(4)S(7), contains two independent mol-ecules, in one of which the central five-membered ring is disordered over two orientations in a 0.924?(3):0.076?(3) ratio. The mol-ecular skeleton is almost planar: the average distance of the atoms from their mean plane is 0.128?(7)?Å in the ordered mol-ecule, and 0.088?(5) and 0.123?(2)?Å in the major and minor disorder components, respectively. The ordered and disordered mol-ecules form separate columns by stacking along the b axis. Adjacent columns inter-act via short S?S [3.33?(2), 3.434?(3), 3.444?(2), 3.503?(2), 3.519?(3) and 3.53?(4)?Å] and S?H [2.814?(2), 2.87?(7), 2.92?(2), 2.9269?(18), 2.93?(2), 2.94?(2), 2.939?(2), 2.967?(2) and 2.974?(1)?Å] contacts.

| S-EPMC3254410 | biostudies-literature

Nickel-Catalyzed Reductive Conjugate Addition of Primary Alkyl Bromides to Enones To Form Silyl Enol Ethers.

Project description:Conjugate addition of organometallic reagents to enones to form silyl enol ether products is a versatile method to difunctionalize activated olefins, but the organometallic reagents required can be limiting. The reductive cross-electrophile coupling of unhindered primary alkyl bromides with enones and chlorosilanes to form silyl enol ether products is catalyzed by a nickel-complexed ortho-brominated terpyridine ligand. The conditions are compatible with a variety of cyclic/acyclic enones and functional groups.

| S-EPMC5260806 | biostudies-literature

Reactions of 2-Aryl-1,3-Dithianes and [1.1.1]Propellane.

Project description:Bicyclo[1.1.1]pentanes (BCPs) have sparked the interest of medicinal chemists due to their recent discovery as bioisosteres of aromatic rings. To study the biological activity of this relatively new class of bioisosteres, reliable methods to incorporate BCPs into target molecules are in high demand, as reflected by a flurry of methods for BCP synthesis in recent years. In this work, we disclose a general method for the synthesis of BCP-containing dithianes which, upon deprotection, provide access to BCP analogues of medicinally abundant diarylketones. A broad scope of 2-aryl-1,3-dithianes, including several heterocyclic derivatives, react with [1.1.1]propellane to afford 26 new derivatives in good to excellent yields. Further transformation of the dithiane portion into a variety of functional groups demonstrates the robustness of the products. A computational study indicates that the reaction of 2-aryl-1,3-dithianes and [1.1.1]propellane proceeds via a two-electron pathway.

| S-EPMC6788743 | biostudies-literature

Recyclable Heterogeneous Chitosan Supported Copper Catalyst for Silyl Conjugate Addition to α,β-Unsaturated Acceptors in Water.

Project description:The first example of an environmentally-benign chitosan supported copper catalyzed conjugate silylation of α,β-unsaturated acceptors was accomplished in water under mild conditions. This protocol provides an efficient pathway to achieve an important class of β-silyl carbonyl compounds and the desired products were obtained in good to excellent yields. Gram-scale synthesis and easy transformation of obtained β-silyl products were also been demonstrated. Remarkably, this chitosan supported copper catalyst can be easily recycled and reused six times without any significant decrease of catalytic activity. The advantages of this newly developed method include operational simplicity, good functional group tolerance, scale-up ability, ready availability, and easy recyclability of catalyst.

| S-EPMC6415219 | biostudies-literature

Synthesis and Suzuki-Miyaura Cross-Coupling of Enantioenriched Secondary Potassium ?-Trifluoroboratoamides: Catalytic, Asymmetric Conjugate Addition of Bisboronic Acid and Tetrakis(dimethylamino)diboron to ?,?-Unsaturated Carbonyl Compounds.

Project description:Enantioenriched potassium ?-trifluoroboratoamides have been synthesized via an asymmetric, copper-catalyzed 1,4-addition of tetrahydroxydiboron (BBA) and tetrakis(dimethylamino)diboron to ?,?-unsaturated amides. These dibora reagents provide access to the desired organotrifluoroborates using effective and atom economical sources of boron. The copper-catalyzed ?-boration is extended to ?,?-unsaturated ketones and esters. Desired potassium organotrifluoroborates are synthesized with yields up to 92% and enantiomeric ratios up to 98:2. The enantioenriched potassium ?-trifluoroboratoamides are successfully cross-coupled with an array of aryl and heteroaryl chlorides in high yield with complete stereochemical fidelity as the transmetalation proceeds through an SE2 mechanism via an open transition state.

| S-EPMC3984882 | biostudies-literature

Pot-Economy Autooxidative Condensation of 2-Aryl-2-lithio-1,3-dithianes.

Project description:The autoxidative condensation of 2-aryl-2-lithio-1,3-dithianes is here reported. Treatment of 2-aryl-1,3-dithianes with n-BuLi in the absence of any electrophile leads to condensation of three molecules of 1,3-dithianes and formation of highly functionalized α-thioether ketones orthothioesters in 51-89% yields upon air exposure. The method was further expanded to benzaldehyde dithioacetals, affording corresponding orthothioesters and α-thioether ketones in 48-97% yields. The experimental results combined with density functional theory studies support a mechanism triggered by the autoxidation of 2-aryl-2-lithio-1,3-dithianes to yield a highly reactive thioester that undergoes condensation with two other molecules of 2-aryl-2-lithio-1,3-dithiane.

| S-EPMC6150673 | biostudies-literature

(5E)-2-[4,5-Bis(methyl-sulfan-yl)-1,3-dithiol-2-yl-idene]-5-(4-iodo-1,3-dithiol-2-yl-idene)-1,3-dithio-lan-4-one.

Project description:The mol-ecular framework of the title compound, C(11)H(7)IOS(8), is almost planar [maximum deviation = 0.040?(4)?Å], except for the two methyl-sulfanyl groups, which are twisted relative to the mol-ecular skeleton, making C-S-C-C torsion angles of 144.1?(8) and -141.3?(8)°. In the crystal, mol-ecules are stacked alternately in opposite orientations, forming a one-dimensional column parallel to [110]. The primary inter-actions between mol-ecules comprising the columns are of the S?S type [3.554?(1)?Å]. Inter-actions between columns are of the S?S type [3.411?(1) along b and 3.444?(1)?Å along c], as well as S?I contacts [3.435?(2)?Å].

| S-EPMC2971353 | biostudies-literature

Mechanism of NHC-Catalyzed Conjugate Additions of Diboron and Borosilane Reagents to ?,?-Unsaturated Carbonyl Compounds.

Project description:Broadly applicable enantioselective C-B and C-Si bond-forming processes catalyzed by an N-heterocyclic carbene (NHC) were recently introduced; these boryl and silyl conjugate addition reactions (BCA and SCA, respectively), which proceed without the need for a transition-metal complex, represent reaction pathways that are distinct from those facilitated by transition-metal-containing species (e.g., Cu, Ni, Pt, Pd, or Rh based). The Lewis-base-catalyzed (NHC) transformations are valuable to chemical synthesis, as they can generate high enantioselectivities and possess unique chemoselectivity profiles. Here, the results of investigations that elucidate the principal features of the NHC-catalyzed BCA and SCA processes are detailed. Spectroscopic evidence is provided illustrating why the presence of excess base and MeOH or H2O is required for efficient and enantioselective boryl and silyl addition reactions. It is demonstrated that the proton sources influence the efficiency and/or enantioselectivity of NHC-catalyzed enantioselective transformations in several ways. The positive, and at times adverse, impact of water (biphasic conditions) on catalytic enantioselective silyl addition reactions is analyzed. It is shown that a proton source can facilitate nonenantioselective background reactions and NHC decomposition, requiring the catalyst to surpass such complications. Stereochemical models are presented that account for the identity of the observed major enantiomers, providing a rationale for the differences in selectivity profiles of BCA and SCA processes.

| S-EPMC5549446 | biostudies-literature

OmicsDI is part of the ELIXIR infrastructure

OmicsDI is an Elixir interoperability service. Learn more ›

Tweets

OmicsDI Databases

PRIDE
PeptideAtlas
MassIVE
JPOST Repository
Physiome Model Repository

EGA
EVA
ENA
LINCS
PAXDB
Cell Collective

MetaboLights
Metabolomics Workbench
MetabolomeExpress
GNPS
BioModels
FAIRDOMHub

ArrayExpress
dbGaP
ExpressionAtlas
GEO
NODE

Information

Databases
Help
API
Contact us
Code on GitHub
Terms of use
Submit Data