608534-39-0Relevant academic research and scientific papers
Stereocomplementary syntheses of 1,ω-distannylated E,Z-isomeric conjugated trienes, tetraenes, and pentaenes
Burghart, Jochen,Sorg, Achim,Brueckner, Reinhard
, p. 6469 - 6483 (2011)
Stereoselective syntheses of 1,6-bis(tributylstannyl)hexa-1,3,5-trienes, 1,8-bis(tributylstannyl)octa-1,3,5,7-tetraenes, and 1,10-bis(tributylstannyl) deca-1,3,5,7,9-pentaenes with various methylation patterns were achieved based on stereocomplementary C=C bond-forming reactions. All-E isomers resulted from Ramberg-Baecklund rearrangements of distannylated diallyl-, allylpentadienyl-, or bis- (pentadienyl)sulfones. Mono-Z-configured 1,ω-bis(tributylstannyl)-1,3,5-polyenes emerged from (Sylvestre-)Julia olefinations of Bu3Sn-substituted enals or dienals with Bu 3Sn-substituted allyl or pentadienyl benzothiazolylsulfones. Related Ramberg-Baecklund approaches provided all-E-1-bromo-6-(tributylstannyl)hexa- 1,3,5-triene but not all-E-1-(tetramethyldioxaborolanyl)-6-(tributylstannyl) hexa-1,3,5-triene. Copyright
Copper-catalyzed hydroboration of propargyl-functionalized alkynes in water
Da Costa, Jessie S.,Braun, Roger K.,Horn, Pedro A.,Lüdtke, Diogo S.,Moro, Angélica V.
, p. 59935 - 59938 (2016/07/11)
The Cu-catalyzed hydroboration of alkynes in operationally simple and environmentally friendly conditions is reported. The reactions are performed in water, at room temperature, under micellar catalysis. Conditions to form the α or β borylated products se
Metal free catalytic hydroboration of multiple bonds in methanol using N-heterocyclic carbenes under open atmosphere
Wen, Kun,Chen, Jinbo,Gao, Feng,Bhadury, Pinaki S.,Fan, Erkang,Sun, Zhihua
, p. 6350 - 6356 (2013/09/23)
An easy to operate method of catalytic hydroboration of unsaturated compounds has been developed with wide substrate scope. Reactions of various aldimines, ketimines, α,β-unsaturated carbonyl compounds, and alkynes were successfully executed with bis(pinacolato)diboron and N-heterocyclic carbenes in methanol without requiring a transition metal or inert atmosphere.
Rewriting the bacterial glycocalyx via Suzuki-Miyaura cross-coupling
Spicer, Christopher D.,Davis, Benjamin G.
supporting information, p. 2747 - 2749 (2013/05/08)
Suzuki-Miyaura cross-coupling has been used to couple novel carbohydrate-based boronic acids, site-selectively, to the surface of E. coli at an unnatural amino acid. In this way, benign metal-catalyzed cellular switching allowed modulation of interactions with biomolecular partners via prokaryotic O-glycosylation mimics. The Royal Society of Chemistry 2013.
Highly selective methods for synthesis of internal (α-) vinylboronates through efficient NHC-Cu-catalyzed hydroboration of terminal alkynes. Utility in chemical synthesis and mechanistic basis for selectivity
Jang, Hwanjong,Zhugralin, Adil R.,Lee, Yunmi,Hoveyda, Amir H.
supporting information; experimental part, p. 7859 - 7871 (2011/06/27)
Cu-catalyzed methods for site-selective hydroboration of terminal alkynes, where the internal or α-vinylboronate is generated predominantly (up to >98%) are presented. Reactions are catalyzed by 1-5 mol % of N-heterocyclic carbene (NHC) complexes of copper, easily prepared from N-aryl-substituted commercially available imidazolinium salts, and proceed in the presence of commercially available bis(pinacolato)diboron [B2(pin)2] and 1.1 equiv of MeOH at -50 to -15 °C in 3-24 h. Propargyl alcohol and amine and the derived benzyl, tert-butyl, or silyl ethers as well as various amides are particularly effective substrates; also suitable are a wide range of aryl-substituted terminal alkynes, where higher α-selectivity is achieved with substrates that bear an electron-withdrawing substituent. α-Selective Cu-catalyzed hydroborations are amenable to gram-scale procedures (1 mol % catalyst loading). Mechanistic studies are presented, indicating that α selectivity arises from the structural and electronic attributes of the NHC ligands and the alkyne substrates. Consistent with suggested hypotheses, catalytic reactions with a Cu complex, derived from an N-adamantyl-substituted imidazolinium salt, afford high β selectivity with the same class of substrates and under similar conditions.
