Masaya Sawamura

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic asymmetric synthesis by means of secondary interaction between chiral ligands and substratesMasaya Sawamura and Yoshihiko ItoCite this: Chem. Rev. 1992, 92, 5, 857–871Publication Date (Print):July 1, 1992Publication History Published online1 May 2002Published inissue 1 July 1992https://pubs.acs.org/doi/10.1021/cr00013a005https://doi.org/10.1021/cr00013a005research-articleACS PublicationsRequest reuse permissionsArticle Views2600Altmetric-Cita

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTAn Enantioselective Two-Component Catalyst System: Rh−Pd-Catalyzed Allylic Alkylation of Activated NitrilesMasaya Sawamura, Masaki Sudoh, and Yoshihiko ItoView Author Information Department of Chemistry, School of Science The University of Tokyo Hongo, Bunkyo-ku, Tokyo 113, Japan Department of Synthetic Chemistry and Biological Chemistry, Faculty of Engineering Kyoto University, Kyoto 606-01, Japan Cite this: J. Am. Chem. Soc. 1996, 118, 13, 3309

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTThe First Pentahaptofullerene Metal ComplexesMasaya Sawamura, Hitoshi Iikura, and Eiichi NakamuraView Author Information Department of Chemistry, The University of Tokyo Hongo, Bunkyo-ku, Tokyo 113, Japan Cite this: J. Am. Chem. Soc. 1996, 118, 50, 12850–12851Publication Date (Web):December 18, 1996Publication History Received1 August 1996Published online18 December 1996Published inissue 1 January 1996https://pubs.acs.org/doi/10.1021/ja962681xhtt

Compounds having cyclic molecular frameworks are highly regarded for their abundance and diverse utilities. In particular, medium-sized carbocycles and heterocycles exist in a broad spectrum of natural products, bioactive therapeutics, and medicinally significant synthetic molecules. Metal-mediated methods have been developed for the preparation of compounds containing a medium-sized ring (MSR) through cyclization of different classes of substrates and acyclic precursors. This review focuses on

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic asymmetric synthesis with trans-chelating chiral diphosphine ligand TRAP: rhodium-catalyzed asymmetric Michael addition of .alpha.-cyano carboxylatesMasaya Sawamura, Hitoshi Hamashima, and Yoshihiko ItoCite this: J. Am. Chem. Soc. 1992, 114, 21, 8295–8296Publication Date (Print):October 1, 1992Publication History Published online1 May 2002Published inissue 1 October 1992https://pubs.acs.org/doi/10.1021/ja00047a053https://doi.org/10.1021/ja000

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChiral phosphine ligands modified by crown ethers: an application to palladium-catalyzed asymmetric allylation of .beta.-diketonesMasaya Sawamura, Hiroshi Nagata, Hiroaki Sakamoto, and Yoshihiko ItoCite this: J. Am. Chem. Soc. 1992, 114, 7, 2586–2592Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Published inissue 1 March 1992https://pubs.acs.org/doi/10.1021/ja00033a035https://doi.org/10.1021/ja00033a035research-arti

"Bucky ferrocenes", molecular hybrids of ferrocene and fullerene, have been synthesized in good yield on gram scale by treatment of C(60)HMe(5) or C(70)HMe(3) with [FeCp(CO)(2)](2) and their structures studied with physical methods including X-ray crystallography.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Structures of Trans-Chelating Chiral Diphosphine Ligands Bearing Aromatic P-Substituents, (S,S)-(R,R)- and (R,R)-(S,S)-2,2''-Bis[1-(diarylphosphino)ethyl]-1,1''-biferrocene (ArylTRAPs) and Their Transition Metal ComplexesMasaya Sawamura, Hitoshi Hamashima, Masanobu Sugawara, Ryoichi Kuwano, and Yoshihiko ItoCite this: Organometallics 1995, 14, 10, 4549–4558Publication Date (Print):October 1, 1995Publication History Published online1 May 2

Copper-catalyzed allylic alkylation of azoles, a pyridine N-oxide, and fluoroarenes with secondary allylic phosphates proceeded under mild reaction conditions with excellent γ-E-selectivity. The reactions with enantioenriched allylic phosphates proceeded with 1,3-anti stereoselectivity to generate an allylic stereogenic center at the position α to the aromatic ring.

Not bulky substituents but flexible alkyl groups led to the hitherto highest enantioselectivities for the asymmetric hydrosilylation of simple ketones catalyzed by diphosphanerhodium complexes. The reduction of acetophenone in the presence of the diphosphane ligand 1, R = nPr,nBu, gave 92% ee, whereas with 1, R = Ph and R = iPr, ee values of only 15% and 1%, respectively, were achieved.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGold(I)-Catalyzed Asymmetric Aldol Reaction of N-Methoxy-N-methyl-.alpha.-isocyanoacetamide (.alpha.-Isocyano Weinreb Amide). An Efficient Synthesis of Optically Active .beta.-Hydroxy .alpha.-Amino Aldehydes and KetonesMasaya Sawamura, Yuki Nakayama, Tomoki Kato, and Yoshihiko ItoCite this: J. Org. Chem. 1995, 60, 6, 1727–1732Publication Date (Print):March 1, 1995Publication History Published online1 May 2002Published inissue 1 March 1995https://pubs.a