## Abstract The regioselective ring‐opening reactions of some epoxides with ammonium thiocyanate in the presence of a series of new 9__H__‐thioxanthen‐9‐one‐fused azacrown ethers, __i.e.__, **7**–**11** (__Scheme 1__), and also of dibenzo[18]crown‐6 (**12**), __Kryptofix__^®^ __22__ (**13**), and b
An Efficient Novel Synthesis of Hydroxy- and Alkoxysultams Using MMPP as Oxidant of Isothiazolium Salts.
✍ Scribed by Kathleen Taubert; Anja Siegemund; Alexander Eilfeld; Sven Baumann; Joachim Sieler; Baerbel Schulze
- Publisher
- John Wiley and Sons
- Year
- 2004
- Weight
- 107 KB
- Volume
- 35
- Category
- Article
- ISSN
- 0931-7597
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## Abstract A novel series of 2‐hydroxy‐12‐aryl‐8,9,10,12‐tetrahydrobenzo[__a__]xanthene‐11‐ones were synthesized by the one‐pot multicomponent condensation of 2,7‐dihydroxynaphthalene, aromatic aldehydes, and cyclic 1,3‐dicarbonyl compounds in the presence of a catalytic amount of __p__‐toluenesul