- Ring transformations of heterocyclic compounds. XXII [1]. Pyrido[1,2-a]indolium salts from 2-methyl-3H-indoles by pyrylium mediated three carbon annelation
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The synthesis of pyrido[1,2-a]indolium perchlorates 8,11 from 2,4,6-triarylpyrylium perchlorates 1 and 2-methyl-3H-indoles 6,9 in the presence of a basic condensing agent (anhydrous sodium acetate, piperidine acetate, triethylamine/acetic acid, triethylamine) in ethanol by a 2,4-[C3+C2N] pyrylium ring transformation is reported. Spectroscopic data of the transformation products and their mode of formation are discussed.
- Zimmermann, Thomas,Hennig, Lothar
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p. 263 - 269
(2007/10/03)
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- Spiro-oxazine compound
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A spiro-oxazine compound represented by the following general formula (A) or (A') is a photochromic compound having an excellent fatigue resistance to repetition of coloration and decoloration and an abundance of hues: STR1 wherein the α ring is a ring selected from a 5-membered ring having one N atom, which may be connected to a benzene ring or naphthalene ring, and a 6-membered ring having one N atom, with the proviso that the N atom in the αring is bonded to a C1-20 alkyl or another organic group, X is selected from O, S, Se and N--R1 (in which R1 is selected from H, and C1-20 alkyl and other organic groups), R2 and R3 are selected from --OH, amino, C1-20 alkoxy, halogen, and other groups, and k is an integer of 0 to 2.
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