𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Reactions of 2-aryl-4-methoxy-9-oxocyclohepta[b]pyrylium perchlorates with hydroxylamine and hydrazines

✍ Scribed by Dao-Lin Wang; Kimiaki Imafuku

Publisher
Journal of Heterocyclic Chemistry
Year
1998
Tongue
English
Weight
360 KB
Volume
35
Category
Article
ISSN
0022-152X

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

2‐Aryl‐4‐methoxy‐9‐oxocyclohepta[b]pyrylium perchlorates 1a‐c reacted with hydroxylamine hydrochloride and hydrazine sulfate in the presence of triethylamine to afford 2‐aryl‐4,9‐dihydrocyclohepta[b]pyran‐4,9‐dione 4‐oximes 3a‐c and 4‐hydrazones 4a‐c in good yields, respectively. On the other hand, the reactions with methylhydrazine and phenylhydrazine gave respectively 1‐methyl‐ and 1‐phenyl‐substituted 5‐aryl‐3‐(3‐tropolonyl)pyrazoles 5a‐c and 6a‐c in excellent yields. Treatment with 4‐nitrophenylhydrazine gave 2‐aryl‐4,9‐dihydrocyclohepta[b]pyran‐4,9‐dione 4‐(4‐nitrophenyl)hydrazones 7a‐c in good yields.

📜 SIMILAR VOLUMES

Reactions of 3-acetyltropolone with benz
Reactions of 3-acetyltropolone with benzaldehydes in trimethyl orthoformate in the presence of perchloric acid: Synthesis of 2-aryl-4-methoxy-9-oxocyclohepta[b]pyrylium perchlorates
✍ Dao-Lin Wang; Kimiaki Imafuku 📂 Article 📅 1998 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 192 KB 👁 1 views

## Abstract 3‐Acetyltropolone (1) reacted with benzaldehydes in trimethyl orthoformate in the presence of perchloric acid to afford 2‐aryl‐4‐methoxy‐9‐oxocyclohepta[__b__]pyrylium perchlorates 3a‐c in 25–37% yields. From the filtrates, 3‐(3,4‐diaryl‐3‐butenoyl)tropolones 4a,b and 3‐(2‐methoxycinnam

ChemInform Abstract: Five-Membered 2,3-D
ChemInform Abstract: Five-Membered 2,3-Dioxo Heterocylces. Part 66. Reactions of (2Z,5Z)-1-Aryl-3-hydroxy-5- [3,3-dimethyl-3,4-dihydroisoquinolin-1(2H)-ylidene] pent-2-ene-1,4-diones with o-Phenylenediamine and Hydrazine. Crystalline and Molecular Structure of 2-{(Z)-8,8-Dimethyl-2,3,8,9-tetrahydro[1,4]dioxino [2,3-g]isoquinolin-6(7H)-ylidene}-1-(3-phenyl-1H-pyrazol-5-yl)ethanone (IV).
✍ V. V. Khalturina; Yu. V. Shklyaev; Z. G. Aliev; A. N. Maslivets 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 34 KB 👁 1 views