Perchloric Acid–Silica (HClO4⋅SiO2)‐Catalyzed Synthesis of 14‐Alkyl‐ or 14‐Aryl‐14H‐dibenzo[a,j]xanthenes and N‐[(2‐Hydroxynaphthalen‐1‐yl)methyl]amides |
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| Authors: | Biswanath Das D?Nandan Kumar Keetha Laxminarayana B Ravikanth |
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| Institution: | 1. Organic Chemistry Division‐I, Indian Institute of Chemical Technology, Hyderabad‐500?007, India, (phone: +91‐40‐7193434;2. fax: +91‐40‐7160512) |
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| Abstract: | The synthesis of 14‐aryl‐ or 14‐alkyl‐14H‐dibenzoa,j]xanthenes 3 involving the treatment of naphthalen‐2‐ol ( 1 ) with arenecarboxaldehydes or alkanals 2 in the presence of HClO4?SiO2 as a heterogeneous catalyst was achieved (Table 1), and this reaction was extended to the preparation of N‐(2‐hydroxynaphthalen‐1‐yl)methyl]amides 5 by a three‐component reaction with urea ( 4a ) or an amide 4b – d as a third reactant (Table 2). |
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| Keywords: | 14H‐Dibenzo[a j]xanthenes 14‐alkyl‐ or 14‐aryl‐ Perchloric acid – silica catalysis Catalysis Three‐compound reactions |
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