Atsushi Umehara – 研究成果 — 東北大学

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年別の研究成果

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11 Article

11 件

フィルター

2023
Convergent and Scalable Synthesis of the ABCDE-Ring Fragment of Caribbean Ciguatoxin C-CTX-1
Sasaki, M., Seida, M. & Umehara, A., 2023 1月 6, In: Journal of Organic Chemistry. 88, 1, p. 403-418 16 p.
研究成果: Article › 査読
DMAPO/Boc₂O-Mediated One-Pot Direct N-Acylation of Less Nucleophilic N-Heterocycles with Carboxylic Acids
Umehara, A., Shimizu, S. & Sasaki, M., 2023 3月 8, In: ChemCatChem. 15, 5, e202201596.
研究成果: Article › 査読

Open Access
1 被引用数 (Scopus)
2022
Convergent Synthesis of the HIJKLMN-Ring Fragment of Caribbean Ciguatoxin C-CTX-1 by a Late-Stage Reductive Olefin Coupling Approach
Sasaki, M., Iwasaki, K., Arai, K., Hamada, N. & Umehara, A., 2022 5月, In: Bulletin of the Chemical Society of Japan. 95, 5, p. 819-824 6 p.
研究成果: Article › 査読
1 被引用数 (Scopus)
2021
Synthesis of leuconoxine, leuconodine B, and rhazinilam by transformation of melodinine E via 6-hydro-21-dehydroxyleuconolam
Umehara, A., Ueda, H. & Tokuyama, H., 2021 1月 22, In: Tetrahedron. 79, 131809.
研究成果: Article › 査読

Open Access
1 被引用数 (Scopus)
2019
Further studies on Ni/Zr-mediated one-pot ketone synthesis: Use of a mixture of Ni^I- And Ni^II-catalysts greatly improves the molar ratio of coupling partners
Umehara, A. & Kishi, Y., 2019, In: Chemistry Letters. 48, 8, p. 947-950 4 p.
研究成果: Article › 査読

Open Access
4 被引用数 (Scopus)
2018
Catalytic enantioselective carbon-carbon bond forming reactions of masked acyl cyanides
Umehara, A., 2018, In: Yuki Gosei Kagaku Kyokaishi/Journal of Synthetic Organic Chemistry. 76, 3, p. 255-256 2 p.
研究成果: Article › 査読

Open Access
1 被引用数 (Scopus)
2016
Condensation of Carboxylic Acids with Non-Nucleophilic N-Heterocycles and Anilides Using Boc₂O
Umehara, A., Ueda, H. & Tokuyama, H., 2016 11月 18, In: Journal of Organic Chemistry. 81, 22, p. 11444-11453 10 p.
研究成果: Article › 査読
15 被引用数 (Scopus)
2014
Total syntheses of leuconoxine, leuconodine B, and melodinine e by oxidative cyclic aminal formation and diastereoselective ring-closing metathesis
Umehara, A., Ueda, H. & Tokuyama, H., 2014 5月 2, In: Organic letters. 16, 9, p. 2526-2529 4 p.
研究成果: Article › 査読
66 被引用数 (Scopus)
2012
A simple proline-based organocatalyst for the enantioselective reduction of imines using trichlorosilane as a reductant
Kanemitsu, T., Umehara, A., Haneji, R., Nagata, K. & Itoh, T., 2012 5月 20, In: Tetrahedron. 68, 20, p. 3893-3898 6 p.
研究成果: Article › 査読
36 被引用数 (Scopus)
Stereoselective synthesis of vic-halohydrins via l-tert-leucine-catalyzed syn-selective aldol reaction
Umehara, A., Kanemitsu, T., Nagata, K. & Itoh, T., 2012, In: Synlett. 3, p. 453-457 5 p.
研究成果: Article › 査読
11 被引用数 (Scopus)
2011
L -t-Leucine-catalyzed direct asymmetric aldol reaction of cyclic ketones
Kanemitsu, T., Umehara, A., Miyazaki, M., Nagata, K. & Itoh, T., 2011 2月 1, In: European Journal of Organic Chemistry. 5, p. 993-997 5 p.
研究成果: Article › 査読
32 被引用数 (Scopus)