108606-85-5Relevant academic research and scientific papers
2-Azaallyl Anion Initiated Ring-Opening Polymerization of N-Sulfonyl Aziridines: One-Pot Synthesis of Primary Amine-Ended Telechelic Polyaziridines
Wang, Ying,Yang, Ruhan,Luo, Wenyi,Li, Zhunxuan,Zhang, Zhen,Wu, Chuande,Hadjichristidis, Nikos
, (2019)
Using the easily accessible 2-azaallyl anions as initiators, the one-pot synthesis of well-defined primary amine-ended telechelic polyaziridines (α-NH2 PAzs) has been achieved through the ring-opening polymerization (ROP) of N-sulfonyl aziridines followed by hydrolysis of the diphenylketimine moiety (- N=C - Ph2). The 2-azaallyl anions were synthesized from the reaction of diphenylketimine or N-[aryl-methylene]-α-phenylbenzenemethanamine with potassium bis(trimethylsilyl) amide (KHMDS) in situ and used to initiate the ROP of aziridines leading to well-defined α-(Ph2C=N)-α′-aryl-ω-NH PAzs. Along with the diphenylketimine group (- N=C - Ph2), aryl functionalities, such as pyridine and triphenylphosphine moieties, can also be incorporated to the chain end. Chain extension has been applied for the synthesis of poly(N-sulfonyl aziridine)-block-poly(?-caprolactone) (PAz-b-PCL) block copolymers by utilization of the primary amine end group as initiating sites for the ROP of ?-caprolactone catalyzed by tin 2-ethyl hexanoate (SnOct2). Taking advantage of this synthetic approach, core cross-linked multiarm star (CCS) polymers with an outermost shell having amino and triphenylphosphine functionalities have been synthesized via "arm-first" strategy.
Chiral counteranions in asymmetric transition-metal catalysis: Highly enantioselective Pd/Bronsted acid-catalyzed direct α-allylation of aldehydes
Mukherjee, Santanu,List, Benjamin
, p. 11336 - 11337 (2007)
We have developed a highly enantioselective Pd/chiral acid-catalyzed α-allylation of α-branched aldehydes with an allyl amine as the allylating species that creates all-carbon quaternary stereogenic centers in high yields and enantioselectivities. To our knowledge, this is the first time that a chiral anionic ligand is applied for achieving asymmetric induction in a palladium-catalyzed allylic alkylation reaction. Copyright
Double Diastereoselective Approach to Chiral syn- and anti-1,3-Diol Analogues through Consecutive Catalytic Asymmetric Borylations
Pujol, Alba,Whiting, Andrew
, p. 7265 - 7279 (2017/07/26)
Homoallylic boronate carboxylate esters derived from unsaturated aldehydes via an imination, β-borylation, imine hydrolysis, and Wittig trapping sequence, were subjected to a second boryl addition to give 1,3-diborylated carboxylate esters. Control of the
One-pot catalytic asymmetric borylation of unsaturated aldehyde-derived imines; Functionalisation to homoallylic boronate carboxylate ester derivatives
Pujol, Alba,Calow, Adam D. J.,Batsanov, Andrei S.,Whiting, Andrew
supporting information, p. 5122 - 5130 (2015/05/13)
The β-borylation reaction of α,β-unsaturated aldehyde-derived imines, formed in situ, has been studied using a one-pot methodology, as a route to β-boryl aldehydes. The instability of the β-boryl aldehydes meant that derivatisation was required and routes
Total synthesis of fluoxetine and duloxetine through an in situ imine formation/borylation/transimination and reduction approach
Calow, Adam D. J.,Fernandez, Elena,Whiting, Andrew
, p. 6121 - 6127 (2014/08/05)
We report efficient, catalytic, asymmetric total syntheses of both (R)-fluoxetine and (S)-duloxetine from α,β-unsaturated aldehydes conducting five sequential one-pot steps (imine formation/copper mediated β-borylation/transimination/reduction/oxidation) followed by the specific ether group formation which deliver the desired products (R)-fluoxetine in 45% yield (96% ee) and (S)-duloxetine in 47% yield (94% ee). This journal is the Partner Organisations 2014.
A selective transformation of enals into chiral γ-amino alcohols
Calow, Adam D. J.,Batsanov, Andrei S.,Pujol, Alba,Sole, Cristina,Fernandez, Elena,Whiting, Andrew
supporting information, p. 4810 - 4813 (2013/10/08)
A one-pot synthesis of chiral amino alcohols from α,β- unsaturated aldehydes is reported which circumvents competitive 1,2- versus 1,4-boryl addition, by means of using a sterically hindered amine-derived imine. In addition to the complete chemoselectivit
Self-supported chiral titanium cluster (SCTC) as a robust catalyst for the asymmetric cyanation of imines under batch and continuous flow at room temperature
Seayad, Abdul M.,Ramalingam, Balamurugan,Chai, Christina L. L.,Li, Chuanzhao,Garland, Marc V.,Yoshinaga, Kazuhiko
supporting information; experimental part, p. 5693 - 5700 (2012/06/15)
A robust heterogeneous self-supported chiral titanium cluster (SCTC) catalyst and its application in the enantioselective imine-cyanation/Strecker reaction is described under batch and continuous processes. One of the major hurdles in the asymmetric Strecker reaction is the lack of availability of efficient and reusable heterogeneous catalysts that work at room temperature. We exploited the readily hydrolyzable nature of titanium alkoxide to synthesize a self-supported chiral titanium cluster (SCTC) catalyst by the controlled hydrolysis of a preformed chiral titanium-alkoxide complex. The isolated SCTC catalysts were remarkably stable and showed up to 98% enantioselectivity (ee) with complete conversion of the imine within 2 h for a wide variety of imines at room temperature. The heterogeneous catalysts were recyclable more than 10 times without any loss in activity or selectivity. The robustness, high performance, and recyclability of the catalyst enabled it to be used in a packed-bed reactor to carry out the cyanation under continuous flow. Up to 97% ee and quantitative conversion with a throughput of 45 mgh-1 were achieved under optimized flow conditions at room temperature in the case of benzhydryl imine. Furthermore, a three-component Strecker reaction was performed under continuous flow by using the corresponding aldehydes and amines instead of the preformed imines. A good product distribution was obtained for the formation of amino nitriles with ee values of up to 98%. Synthetically useful ee values were also obtained for challenging α-branched aliphatic aldehyde by using the three-component continuous Strecker reaction.
Self-assembled organic-inorganic hybrid silica with ionic liquid framework: A novel support for the catalytic enantioselective Strecker reaction of imines using Yb(OTf)3-pybox catalyst
Karimi, Babak,Maleki, Aziz,Elhamifar, Dawood,Clark, James H.,Hunt, Andrew J.
supporting information; experimental part, p. 6947 - 6949 (2010/11/04)
Yb(OTf)3-pybox is immobilized in a novel self-assembled ionic liquid hybrid silica and has been successfully applied as a catalyst for the asymmetric Strecker hydrocyanation of aldimines. This catalytic system can be reused for at least 6 times without any significant loss of activity and enantioselectivity.
4-Substituted 5-nitroisoquinolin-1-ones from intramolecular Pd-catalysed reaction of N-(2-alkenyl)-2-halo-3-nitrobenzamides
Dhami, Archana,Mahon, Mary F.,Lloyd, Matthew D.,Threadgill, Michael D.
experimental part, p. 4751 - 4765 (2009/10/23)
4-Methyl- and 4-benzyl-5-aminoisoquinolin-1-ones are close analogues of the water-soluble PARP-1 inhibitor 5-AIQ. Their synthesis was approached through Pd-catalysed cyclisations of N-(2-alkenyl)-2-iodo-3-nitrobenzamides. Reaction of N,N-diallyl-2-iodo-3-nitrobenzamide with Pd(PPh3)4 gave a mixture of 2-allyl-4-methyl-5-nitroisoquinolin-1-one and 2-allyl-4-methylene-5-nitro-3,4-dihydroisoquinolin-1-one. N-Benzhydryl-N-cinnamyl-2-iodo-3-nitrobenzamide similarly gave 2-benzhydryl-4-benzyl-5-nitroisoquinolin-1-one and 2-benzhydryl-4-benzylidene-5-nitro-3,4-dihydroisoquinolin-1-one. The isomeric products are not interconvertible. A deuterium-labelling study indicated that the isomers were formed by different pathways: a π-allyl-Pd route and the classical Heck route. The corresponding secondary amides N-allyl-2-iodo-3-nitrobenzamide and N-((substituted)-cinnamyl)-2-iodo-3-nitrobenzamide gave good yields of the required 4-methyl- and 4-((substituted)-benzyl)-5-nitroisoquinolin-1-ones, respectively, under optimised conditions (Pd(PPh3)4, Et3N, Bu4NCl, 150 °C, rapid heating). Hydrogenation of the nitro groups gave 4-methyl- and 4-benzyl-5-aminoisoquinolin-1-ones, which were potent inhibitors of PARP-1 activity.
Chiral lanthanum(III)-binaphthyldisulfonate complexes for catalytic enantioselective strecker reaction
Hatano, Manabu,Hattori, Yasushi,Furuya, Yoshiro,Ishihara, Kazuaki
supporting information; experimental part, p. 2321 - 2324 (2009/10/02)
A catalytic enantioselective Strecker reaction catalyzed by novel chiral lanthanum(III)-binaphthyl disulfonate complexes was developed. The key to promoting the reactions was a semistoichiometric amount of AcOH or i-PrCO2H, which takes advantage of HCN ge
