Zobrazeno 1 - 10
of 310
pro vyhledávání: '"Choji Kashima"'
Publikováno v:
Liebigs Annalen. 1996:117-120
The photochemical reactions of indane-1-thiones 4 were examined. Irradiation of indane-1-thiones 4c–d bearing δ-hydrogen atoms in the side chain gave cyclic thiol derivatives 5c–d via δ-hydrogen atom abstraction by the excited thiocarbonyl sulf
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bd264b4037014a95870da7b1317bb338
https://doi.org/10.1002/jlac.199619960119
https://doi.org/10.1002/jlac.199619960119
Autor:
Masami Sakamoto, Noriyuki Utsumi, Masaru Ando, Mizuho Saeki, Takashi Mino, Tsutomu Fujita, Akira Katoh, Takehiko Nishio, Choji Kashima
Publikováno v:
Angewandte Chemie. 115:4496-4499
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6c43a2c6c35b1b837fd3538694df6cc9
https://doi.org/10.1002/ange.200351660
https://doi.org/10.1002/ange.200351660
Publikováno v:
Journal of Heterocyclic Chemistry. 40:773-782
3-Aryl-l-menthopyrazoles 1 and 2 and related compounds were prepared from l-menthone, and their enantioselective activities were discussed as chiral ligands. In this series of compounds, 2,6-bis(2-methyl-l-menthopyrazol-3-yl)pyridine (8a), which had
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bce39803f905351acd17793396a1579a
https://doi.org/10.1002/jhet.5570400505
https://doi.org/10.1002/jhet.5570400505
Publikováno v:
Journal of Heterocyclic Chemistry. 40:681-688
N-Acylpyrazoles (1) were promising as good dienophiles, which were easily converted into the desired carboxylic derivatives. Bis(pyrazolyl)methanes, which were derived from chiral pyrazoles, showed the activity of chiral catalyst. Particularly 10 mol
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d870788004777045e1d84effb1e3c40e
https://doi.org/10.1002/jhet.5570400420
https://doi.org/10.1002/jhet.5570400420
Publikováno v:
Journal of Heterocyclic Chemistry. 39:917-925
N-Hydroxyalkyl-1-menthopyrazoles acted as a chiral catalyst for the diethylzinc (1) addition to aromatic aldehydes, and 1-aryl-1-propanols were afforded enantioselectively. These reactions were carried out optimally in toluene at 40 °C in the presen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dba00cdd0a7d9e3297540c9e9b49389a
https://doi.org/10.1002/jhet.5570390511
https://doi.org/10.1002/jhet.5570390511
Publikováno v:
Tetrahedron: Asymmetry. 13:1713-1719
The chelation of AlCl3 with N-acylpyrazoles leads to structural fixation of the acyl moiety and an acceleration in the rate of acylation of secondary alcohols. The chiral environment of the fixed acyl moiety of 2-acyl-3-phenyl-l-menthopyrazole 2 caus
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4af76947abb92688dd5a527f13c32d49
https://doi.org/10.1016/s0957-4166(02)00472-x
https://doi.org/10.1016/s0957-4166(02)00472-x
Publikováno v:
Journal of Heterocyclic Chemistry. 38:601-606
The enantioselective reduction of ketones was accomplished by borane in the presence of pyrazole derivatives, particularly 2-methoxymethyl-3-phenyl-1-menthopyrazole (8). The catalysis of zinc chloride makes it possible to lower the reaction temperatu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c64bc8923cc006cf9e5273d87e32367c
https://doi.org/10.1002/jhet.5570380308
https://doi.org/10.1002/jhet.5570380308
Publikováno v:
Journal of Heterocyclic Chemistry. 37:983-990
The equimolar mixture of N-(hydroxyalkyl)pyrazoles and borane formed boric ester complex, in which the remaining borane was stabilized by the adjacent nitrogen of thr pyrazole ring. The borane complex derived from the chiral pyrazoles such as 3-pheny
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9e05699dc15742b8e4f61a63c7d6ff43
https://doi.org/10.1002/jhet.5570370449
https://doi.org/10.1002/jhet.5570370449
Publikováno v:
The Journal of Organic Chemistry. 64:1108-1114
The reaction of 2-(α,β-unsaturated)acyl-3-phenyl-l-menthopyrazoles (9) with dienes gave Diels−Alder adducts in good yield. The addition of MgBr2·OEt2 or ZnCl2 accelerated these reactions through the formation of chelating bonds such as N···Mg
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d5cfa1acf421eaf3526906e748bd52ad
https://doi.org/10.1021/jo981255m
https://doi.org/10.1021/jo981255m
Publikováno v:
Tetrahedron. 54:14679-14688
Alkyl pyrazole-1-carboxylates (2), which were readily prepared from alkyl chloroformate or carbazate in good yields, were provided as the new facile alkoxycarbonylating agents toward the Grignard reagents for the synthesis of one carbon higher carbox
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f13f6d0fde565c9ef49411063154b438
https://doi.org/10.1016/s0040-4020(98)00947-8
https://doi.org/10.1016/s0040-4020(98)00947-8