Výsledky vyhledávání - "Mikako Kawamura"

A switch of enantiofacial selectivity in chiral ytterbium-catalyzed 1,3-dipolar cycloaddition reactions

Publikováno v: Tetrahedron Letters. 40:3213-3216

Synthesis of both enantiomers of the 1,3-dipolar cycloaddition adducts between nitrones and alkenes has been achieved using the same chiral ytterbium catalyst choosing achiral additives, nitrone and MS 4A.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::219a1ef81fcd4c094c8beae8af286273
https://doi.org/10.1016/s0040-4039(99)00469-4

Zobrazit plný text záznamu

Lithium perchlorate-accelerated Baylis-Hillman reactions

Autor: Mikako Kawamura, Shū Kobayashi

Publikováno v: Tetrahedron Letters. 40:1539-1542

The coupling of α,β-unsaturated carbonyl compounds with aldehydes (the Baylis-Hillman reaction) was accelerated in the presence of a catalytic amount of 1,4-diazabicyclo[2,2,2]octane (DABCO) and lithium perchlorate in ether. A preliminary kinetic s

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::369aee68cddb92f522d11af3b8d5e951
https://doi.org/10.1016/s0040-4039(98)02705-1

Zobrazit plný text záznamu

Lewis acid-catalyzed asymmetric hetero Diels-Alder cycloaddition of a 1-Thiabuta-1,3-diene with Chiral N-Acryloyl- and N-Crotonoyl-oxazolidinone dienophiles

Autor: Akemi Yamaya, Jun-ichi Nishimura, Takao Saito, Mikako Kawamura, Hirofumi Suda

Publikováno v: Tetrahedron Letters. 38:6035-6038

Me 2 AlCl- and TiCl 4 -catalyzed asymmetric hetero Diels-Alder cycloaddition reactions of 2,4-diphenyl-1-thiabuta-1,3-diene with ( S )- N -acryloyl- and ( S )- N -crotonoyl-4-benzyl-1,3-oxazolidin-2-one dienophiles are described in which not only the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::13e3324f758439cc7561284016d83163
https://doi.org/10.1016/s0040-4039(97)01354-3

Zobrazit plný text záznamu

Ytterbium triflate-catalyzed asymmetric hetero Diels-Alder cycloaddition of a 1-thiabuta-1,3-diene with a chiral N-acryloyloxazolidinone dienophile. Diastereoface control by solvents or achiral additives

Autor: Jun-ichi Nishimura, Takao Saito, Mikako Kawamura

Publikováno v: Tetrahedron Letters. 38:3231-3234

Ytterbium triflate [Yb(OTf) 3 ]-catalyzed asymmetric hetero Diels-Alder cycloaddition reaction of 2,4-diphenyl-1-thiabuta-1,3-diene with ( S )- N -acryloyl-4-benzyl-1,3-oxazolidin-2-one is described in which the sense of the π-facial selectivity can

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cd310fe0d8ae30bae63f570cfd234973
https://doi.org/10.1016/s0040-4039(97)00520-0

Zobrazit plný text záznamu

A novel, chiral Lewis acid-induced enantioselective hetero Diels–Alder reaction of a thiabutadiene

Autor: Jun-ichi Nishimura, Mikako Kawamura, Kayoko Takekawa, Takao Saito

Publikováno v: Journal of the Chemical Society, Perkin Transactions 1. :2957-2960

The chiral Lewis acid-induced, enantioselective thia Diels–Alder reaction is described for the first time.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d4438578e5b78cd7a1bc9e80c0be0802
https://doi.org/10.1039/a703590j

Zobrazit plný text záznamu

ChemInform Abstract: Ytterbium Triflate-Catalyzed Asymmetric Hetero Diels-Alder Cycloaddition of a 1-Thiabuta-1,3-diene with a Chiral N- Acryloyloxazolidinone Dienophile. Diastereoface Control by Solvents or Achiral Additives

Autor: Mikako Kawamura, Takao Saito, Jun-ichi Nishimura

Publikováno v: ChemInform. 28

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2aed48ccb4d502e2898b9f58d5726465
https://doi.org/10.1002/chin.199733176

Zobrazit plný text záznamu

ChemInform Abstract: Lanthanide Triflate-Catalyzed Three-Component Coupling Reactions of Aldehydes, Hydroxylamines, and Alkenes Leading to Isoxazolidine Derivatives

Autor: Mikako Kawamura, Shu Kobayashi, Haruro Ishitani, Ryo Akiyama

Publikováno v: ChemInform. 29

Three-component coupling reactions of aldehydes, hydroxylamines, and alkenes proceeded smoothly in the presence of a catalytic amount of a lanthanide triflate, to afford isoxazolidine derivatives in high yields with high diastereoselectivities. The a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::43874b09d359c29dc3efb7fcb68530e5
https://doi.org/10.1002/chin.199805126

Zobrazit plný text záznamu

Vyhledávací nástroje:

Upřesnit hledání