55162-83-9Relevant academic research and scientific papers
Copper-catalyzed enantioselective synthesis of bridged bicyclic ketals from 1,1-disubstituted-4-methylene-1,6-hexanediols and related alkenols
Burde, Ameya S.,Karyakarte, Shuklendu D.,Sylvester, Eric D.,Chemler, Sherry R.
, p. 105 - 108 (2021/01/14)
Bridged bicyclic ketals display a range of bioactivities. Their catalytic enantioselective synthesis from acyclic 1,1-disubstituted alkene diols is disclosed. This reaction combines asymmetric catalysis with a distal radical migration. Alkynes and arenes
Catalytic Acceptorless Dehydrogenation of Aliphatic Alcohols
Fuse, Hiromu,Mitsunuma, Harunobu,Kanai, Motomu
, p. 4493 - 4499 (2020/03/05)
We developed the first acceptorless dehydrogenation of aliphatic secondary alcohols to ketones under visible light irradiation at room temperature by devising a ternary hybrid catalyst system comprising a photoredox catalyst, a thiophosphate organocatalyst, and a nickel catalyst. The reaction proceeded through three main steps: hydrogen atom transfer from the α-C-H bond of an alcohol substrate to the thiyl radical of the photo-oxidized organocatalyst, interception of the generated carbon-centered radical with a nickel catalyst, and β-hydride elimination. The reaction proceeded in high yield under mild conditions without producing side products (except H2 gas) from various alcohols, including sterically hindered alcohols, a steroid, and a pharmaceutical derivative. This catalyst system also promoted acceptorless cross-dehydrogenative esterification from aldehydes and alcohols through hemiacetal intermediates.
Tuning Regioselectivity of Wacker Oxidation in One Catalytic System: Small Change Makes Big Step
Hu, Kang-Fei,Ning, Xiao-Shan,Qu, Jian-Ping,Kang, Yan-Biao
, p. 11327 - 11332 (2018/09/06)
A regioselectivity switchable aerobic Wacker-Tsuji oxidation has been developed using catalytic tert-butyl nitrite as a simple organic redox cocatalyst. By solely switching the solvent, either substituted aldehydes or ketones could be prepared under mild
Copper(I)-catalyzed enantioselective nucleophilic borylation of aldehydes: An efficient route to enantiomerically enriched α-alkoxyorganoboronate esters
Kubota, Koji,Yamamoto, Eiji,Ito, Hajime
, p. 420 - 424 (2015/01/30)
The first catalytic enantioselective nucleophilic borylation of a
Bisnucleophilic substitution as a synthetic tool for ready access to the piperidine alkaloids (+)-Connine, (+)-β-conhydrine, (+)-8-ethylnorlobelol, and (-)-halosaline
Raju, Galla,Anitha, Kadimi,Krishna, Palakodety Radha
, p. 937 - 941 (2015/04/27)
Herein we report the stereoselective total synthesis of (+)-connine, (+)-β-conhydrine, (+)-8-ethylnorlobelol, and (-)-halosaline via bisnucleophilic substitution with benzylamine as the key step.
Radical Cyclization Followed by the Fragmentation of Carbonyl Compounds: Effect of an α-Benzoyl Group
Chien, Li-An,Chang, Che-Chien
, p. 11294 - 11301 (2015/12/01)
To study a recently developed radical cyclization reaction followed by a fragmentation process in more detail, a series of α-benzoyl carbonyl compounds were prepared, including precursors with aldehyde and ketone moieties. Initiated by tributyltin hydride
Enantioselective Hydroformylation of 1-Alkenes with Commercial Ph-BPE Ligand
Yu, Zhiyong,Eno, Meredith S.,Annis, Alexandra H.,Morken, James P.
supporting information, p. 3264 - 3267 (2015/07/15)
A rhodium complex, in conjunction with commercially available Ph-BPE ligand, catalyzes the branch-selective asymmetric hydroformylation of 1-alkenes and rapidly generates α-chiral aldehydes. A wide range of terminal olefins including 1-dodecene were examined, and all delivered high enantioselectivity (up to 98:2 er) as well as good branch:linear ratios (up to 15:1). (Chemical Equation Presented).
Toward the stereoselective synthesis of C1-C23 fragment of spirastrellolide B
Akkapalli, Rajesh,Sharma, Gangavaram V.M.,Damera, Krishna
, p. 4067 - 4070 (2014/07/22)
A convergent synthesis of the protected C(1)-C(23) fragment 4 of the targeted natural product spirastrellolide B is described. The key step of the synthesis is cross metathesis (CM) and TBAF promoted oxa-Michael to construct tetrahydropyran moiety.
Toward the stereoselective synthesis of C1-C23 fragment of spirastrellolide B
Rajesh, Akkapalli,Sharma, Gangavaram V.M.,Damera, Krishna
, p. 4067 - 4070 (2015/02/02)
A convergent synthesis of the protected C(1)-C(23) fragment 4 of the targeted natural product spirastrellolide B is described. The key step of the synthesis is cross metathesis (CM) and TBAF promoted oxa-Michael to construct tetrahydropyran moiety.
An easy-to-use, regioselective, and robust bis(amidate) titanium hydroamination precatalyst: Mechanistic and synthetic investigations toward the preparation of tetrahydroisoquinolines and benzoquinolizine alkaloids
Zhang, Zhe,Leitch, David C.,Lu, Man,Patrick, Brian O.,Schafer, Laurel L.
, p. 2012 - 2022 (2008/02/04)
Amidate-supported titanium amido complexes are efficient and regioselective precatalysts for intermolecular hydroamination of terminal alkynes with primary amines. The synthesis and characterization of the first his(amidate)-supported titanium-imido complex is reported. Its role as the active catalytic species is suggested in the course of product distribution studies using deuteratcd substrates. The bis(amidate)-supported prccatalysts exhibit good functional-group tolerance, even performing hydroaminations in the presence of ester and amide groups. This functional-group tolerance was exploited in the synthesis of a variety of 1-substituted tetrahydroisoquinoline alkaloids and a one-pot hydroaminative procedure for the high yielding preparation of the benzo[a]quinolizine skeleton.
