New heterocyclic system — Bis[1,2,3-benzotriazolo[5,6-b;5′,6′-k]]-18-crown-6
✍ Scribed by É. I. Ivanov; A. A. Polishchuk; P. B. Terent'ev
- Publisher
- Springer US
- Year
- 1988
- Tongue
- English
- Weight
- 162 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0009-3122
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## Abstract The synthesis of new pyrido[3′,2′:5,6]thiopyrano[3,2‐__b__]indol‐5(6__H__)‐ones was accomplished by the Fischer‐indole cyclization of some 2,3‐dihydro‐3‐phenylhydrazonothiopyrano[2,3‐__b__]pyridin‐4(4__H__)‐ones, obtained from the 2,3‐dihydro‐3‐hydroxymethylenethiopyrano[2,3‐__b__]pyrid
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## Abstract Cyclization reactions of oxygen‐bridged pyrimidinethione 1a with 1,2‐bis(bromomethyl)benzene and 1,2,4,5‐tetrakis(bromomethyl)benzene leading to conformationally restricted benzothiazepine derivatives were examined. Molecular conformations of the products were studied by 1D and 2D nmr s