Zobrazeno 1 - 10
of 31
pro vyhledávání: '"Makoto Yamamoto"'
Autor:
Hyuma Masu, Kentaro Yamaguchi, Keiki Kishikawa, Masaki Sakai, Makoto Yamamoto, Shigeo Kohmoto
Publikováno v:
The Journal of Organic Chemistry. 70:1423-1431
[structure: see text] Carboxamides possessing naphthalene rings connected by multiple iminodicarbonyl linkers were synthesized. These molecules forced the naphthalene rings to be placed in the positions facing each other, and they form helical foldam
Autor:
Keiki Kishikawa, Makoto Yamamoto, Yoshiyuki Miyaji, Shigeo Kohmoto, Kazutoshi Yamada, Masaru Tsuruoka
Publikováno v:
Journal of the Chemical Society, Perkin Transactions 1. :2082-2088
Control of three modes of intramolecular reactions, [2+2] and [4+2] cycloadditions, and Type-II cyclisation, is attempted in the photochemical reaction of N-(naphthylethyl)prop-2-enamides. The reactions are affected by the enamide substituents and th
Autor:
Chuya Tatsuno, Keiki Kishikawa, Hyuma Masu, Makoto Yamamoto, Kentaro Yamaguchi, Shigeo Kohmoto
Publikováno v:
Journal of the Chemical Society, Perkin Transactions 1. :4464-4468
Intramolecular diastereoselective [4 + 4] photocycloadditions of acyclic imides 1a and 1b possessing anthracene and naphthalene moieties were carried out in the solid state and in solution. For 1a, novel reversal of diastereoselectivity was observed
Publikováno v:
Journal of the Chemical Society, Perkin Transactions 1. :77-84
N-Benzoyl-N-benzylcinnamamides 1, N-acetyl-N-(1-benzyl)cinnamamides 3 and N-[(1-benzyl)aminocarbonyl]-N-(1-benzyl)cinnamamides 5 have been irradiated by a high-pressure mercury lamp in the presence of benzil in benzene at room temperature to give 3-a
Publikováno v:
Tetrahedron Letters. 37:8879-8882
Intramolecular pholocycloaddition of cyclopropene carboxylic acid allylic esters 1 results in an exclusive formation of 5-oxaspiro[2.4]hepta-4-ones 2, the hydrogen transferred rearrangement products, with induction of three stereogenic centers. Ring
Autor:
Hideaki Kasimura, Ichiro Koyano, Teruyuki Kawatsuji, Kazutoshi Yamada, Makoto Yamamoto, Keiki Kishikawa, Shigeo Kohmoto
Publikováno v:
Bulletin of the Chemical Society of Japan. 69:3261-3265
Norcaradiene derivatives 1, 5-(1-benzyloxycarbonyl-2-methyl-1-propenyl)-3-oxatricyclo[4.4.0.01,5]deca-7,9-dien-4-one, showed a restricted rotation in the 1H NMR spectra. VT 1H NMR measurements in CDCl3 revealed the existence of two rotamers at low te
Publikováno v:
The Journal of Organic Chemistry. 58:7296-7299
Publikováno v:
ChemInform. 22
The intramolecular radical cyclisation of cyclic homoallylic xanthates were explored. In five- or six-membered ring systems, the homoallylic xanthates were easily cyclised to give fused thionolactone derivatives. The thionolactones were converted int
Publikováno v:
ChemInform. 23
The first example of intramolecular radical cyclization of ketene radical synthon is presented. Intramolecular radical cyclization of 2-bromo-ketene-S,S-acetals proceeded highly regioselectively to give the corresponding 5-exo-trig cyclized γ-lacton
Publikováno v:
ChemInform. 23
A novel intramolecular ketene radical cyclization was described. Treatment of α-bromo-β-alkoxycarbonyl- and α-bromo-β-oxoketene dithioacetals with tributyltin hydride and AIBN gave lactones and cyclic ketones bearing bis(methylthio)methylene subs