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N-Heterocyclic carbene-catalyzed cyclotetramerization of acrylates.
N-Heterocyclic carbenes (NHCs) were found to catalyze the unprecedented cyclotetramerization of acrylates, producing the trisubstituted cyclopentenones in moderate yields. The proton or deuterium
Catalytic enantioselective Strecker reaction of ketoimines using catalytic amount of TMSCN and stoichiometric amount of HCN
Abstract Catalyst loading as low as 0.1 mol % was achieved in the enantioselective Strecker reaction of ketoimines. Excellent enantioselectivity was obtained with a combined use of a catalytic amount
Cyclodextrin as a Macrocyclic Monomer: Cationic Ring‐Opening Polymerization of O‐Permethylcyclodextrins
It has been disclosed for the first time that a cyclodextrin (CD) derivative is able to act as a macrocyclic monomer for ring-opening polymerization to produce linear polyglucan. O-Permethylated α-,
Solid-state polycondensation of natural aldopentoses and 6-deoxyaldohexoses. Facile preparation of highly branched polysaccharide
Abstract Solid-state polycondensation of natural aldopentoses and 6-deoxyaldohexoses was found to take place in the presence of H3PO4 (5 mol%) at 100–110 °C under a N2 flow, giving highly branched
Organocatalytic tail-to-tail dimerization of olefin: umpolung of methyl methacrylate mediated by N-heterocyclic carbene.
Highly selective tail-to-tail dimerization of methyl methacrylate has been realized by an N-heterocyclic carbene catalyst, giving dimethyl 2,5-dimethyl-2-hexenedioate with an E/Z ratio of 95:5 in 86%
New entries in Lewis acid-Lewis base bifunctional asymmetric catalyst: catalytic enantioselective Reissert reaction of pyridine derivatives.
Preliminary mechanistic studies indicated that both sulfoxides and phosphine sulfides can activate TMSCN as a Lewis base, and the sulfoxide with appropriate stereochemistry might stabilize a highly enantioselective bimetallic complex (a presumed active catalyst) through internal coordination to aluminum.
Catalytic enantioselective Strecker reaction of ketoimines.
The reaction has a broad substrate generality, giving high enantioselectivity from aromatic, ethyl, primary alkyl, and alpha,beta-unsaturated ketoimines, and could be easily converted to disubstituted alpha-amino acids and their derivatives.
Cooperative N-heterocyclic carbene/Brønsted acid catalysis for the tail-to-tail (co)dimerization of methacrylonitrile.
The stoichiometric reactions in the presence and absence of an alcohol suggest that the alcohol additives play a role in promoting the intermolecular proton transfers from the deoxy-Breslow intermediate to the regenerated NHC in the second half of the catalytic cycle.
Multibranching polymerization: palladium-catalyzed ring-opening polymerization of cyclic carbamate to produce hyperbranched dendritic polyamine
A new concept, termed multibranching polymerization (MBP) is presented for chain polymeriozation, providing a dendritic polymer involving the initiator as the core. The most characteristic aspect of
Biofuel cell backpacked insect and its application to wireless sensing.
The results indicate that the imBFC has sufficient potential as a battery for novel ubiquitous robots such as insect cyborgs.