✦ LIBER ✦

Novel Ether-Ring Transformation via a Phenonium Ion.

✍ Scribed by Shinji Nagumo; Yusuke Ishii; Yo-ichiro Kakimoto; Norio Kawahara

Publisher: John Wiley and Sons
Year: 2010
Weight: 28 KB
Volume: 33
Category: Article
ISSN: 0931-7597
DOI: 10.1002/chin.200243127

No coin nor oath required. For personal study only.

📜 SIMILAR VOLUMES

Novel ether-ring transformation via a ph

Novel ether-ring transformation via a phenonium ion

✍ Shinji Nagumo; Yusuke Ishii; Yo-ichiro Kakimoto; Norio Kawahara 📂 Article 📅 2002 🏛 Elsevier Science 🌐 French ⚖ 170 KB

Upon treatment with CF 3 COOH at 70°C, trisubstituted-tetrahydropyrans, which were stereoselectively prepared from d-lactones, were found to be converted into the corresponding 2,5-disubstituted-tetrahydrofurans stereospecifically via a phenonium ion. Furthermore, the stereocontrolled formal synthes

Lactonization of methyl 4-aryl-5-tosylox

Lactonization of methyl 4-aryl-5-tosyloxyhexanoate via a phenonium ion

✍ Shinji Nagumo; Tomoaki Hisano; Yo-ichiro Kakimoto; Norio Kawahara; Machiko Ono; 📂 Article 📅 1998 🏛 Elsevier Science 🌐 French ⚖ 224 KB

Lactonization of methyl 4-atyl-5-tosyloxy hexanoate 3 via a phenonium ion gave 7 -lactone 4 selectively under thermodynamical conditions while it afforded 6-1actone 5 preferentially under kinetic conditions.

ChemInform Abstract: Lactonization of Me

ChemInform Abstract: Lactonization of Methyl 4-Aryl-5-tosyloxyhexanoate via a Phenonium Ion.

✍ S. NAGUMO; T. HISANO; Y. KAKIMOTO; N. KAWAHARA; M. ONO; T. FURUKAWA; S. TAKEDA; 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 30 KB

A novel ring transformation of 5-azidoth

A novel ring transformation of 5-azidothiazoles

✍ Erik Ceulemans; Leonard K. Dyall; Wim Dehaen 📂 Article 📅 1999 🏛 Elsevier Science 🌐 French ⚖ 516 KB

The 4-oxoalkyl-and 4-iminoaikyl-5-azidothiazoles undergo a ring transformation with nitrogen loss at relatively low temperatures to afford 4-cyanooxazoles and 4-cyanoimidazoles, respectively. The mechamsm, wMch ts thought to revolve a ring openmg-rmg closure process, is discussed.

ChemInform Abstract: Stereoselective Rin

ChemInform Abstract: Stereoselective Ring Expansion via Bicyclooxonium Ion. A Novel Approach to Oxocanes.

✍ Yasuharu Sakamoto; Kyoko Tamegai; Tadashi Nakata 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 32 KB 👁 2 views

A novel ring transformation of 5-nitrour

A novel ring transformation of 5-nitrouracils into 5-carbamoyluracils via the retro-michael reaction

✍ Kosaku Hirota; Yukio Kitade; Shigeo Senda 📂 Article 📅 1981 🏛 Elsevier Science 🌐 French ⚖ 118 KB

Treatment of 1,3-disubstituted 5-nitrouracils(5) with malonamide in ethanolic sodium ethoxide caused a ring transformation to afford l-substituted 5-carbamoyluracils(6) in good yields. Reactions of uracil derivatives with various nucleophiles have been extensively investigated in connection with bio