3,4-Benzoxanthene cyclic ethers
โ Scribed by A. Mustafa; N. Latif; H. El-Namaky
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 471 KB
- Volume
- 84
- Category
- Article
- ISSN
- 0165-0513
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Abatmct-'l'lm acetone, acetophenone and benzophenonainitiated photochemical alkylation of cyclic ethers with ok&s is described. Alpha-alkykted cyclic ethers were obtained as the l:l-adducts in yields of up to 40% with terminal okiins, and yields of up to 82% with a&unsaturated esters. 1 In partial
1. Reagents and conditions for cyclic ether formation: (i) HCl, EtOH/H 2 O (2:1), rt, 100 min; (ii) (a) COCl 2 , pyridine, CH 2 Cl 2 , rt, 22 h, (b) MeOH, 30 min. Scheme 2. Reagents and conditions: (i) COCl 2 , pyridine, CH 2 Cl 2 , rt, 5 h; (ii) CH 2 @CHCH 2 OH, rt, 30 min. Scheme 3. Reagents and c