Formation of Hydro-1,3-diazines by the Reaction of Benzo[b]cyclohepta[e][1,4]oxazine with α,γ-Diamines
作者:Ohki Sato、Manabu Seshimo、Josuke Tsunetsugu
DOI:10.1039/a707825k
日期:——
Contrary to a report that the reaction of benzo[b]cyclohepta[e][1,4]oxazine 1 with α,γ-diamine 2b produces 1,2,3,4-tetrahydrocyclohepta[b][1,4]diazepine 4, the product was found to be 2-phenyl-3,4,5,6-tetrahydropyrimidine 5b and is peculiar to the reaction of 1 with α,γ-diamines 2 as well as β-aminamide 7.
与有关苯并[ b ]环庚[[ e ] [1,4]恶嗪1与α,γ-二胺2b反应的报告相反,生成1,2,3,4-四氢环庚[ b ] [1,4]二氮杂4,发现该产物是2-苯基-3,4,5,6-四氢嘧啶5b,是1与α,γ-二胺2和β-氨基酰胺7的反应所特有的。
Conductive Salts of Tropylium Ions with Tetracyanoquinodimethan Anion Radical (TCNQ<sup>\ewdot</sup>) and Bisthiadiazolotetracyanoquinodimethan Anion Radical (BTDA–TCNQ<sup>\ewdot</sup>)
Tropylium ions have been found to be good cations for forming highly conductive salts of TCNQ\ewdot. Tropylium ions with different reduction potentials were prepared. The first reduction potentials which are correlated with the substituent constants σp+ control the formation of the salts. The cations with higher reduction potentials underwent a reaction with TCNQ\ewdot to give neutral TCNQ and coupling
The title compounds, namely, the chiral acetals and their positional isomers were efficiently prepared by heating 6-bromocyclohepta[b][1,4]benzoxazines and the substituted o-aminophenols at 120 °C in acetic acid.
通过在 120 °C 的乙酸中加热 6-溴环庚 [b][1,4] 苯并恶嗪和取代的邻氨基苯酚,可以有效地制备标题化合物,即手性缩醛及其位置异构体。
Intermolecular Bromine Transfer of 2-Amino-7-bromotropone Derivatives Catalyzed by Strong Acid
acetic acid containg a trace amount of coned sulfuric acid at 120 °C under nitrogen, 2-bromo-7-(2-hydroxyanilino)tropone (1a) gave 6-bromocyclohepta[b][1,4]benzoxazine (2a) as the main product and cyclohepta[b][1,4]benzoxazine, its 6,8-dibromo derivative and trace amounts of other mono-, di-, and tribromo compounds. This reaction became much more complex in the presence of oxygen. A similar bromine transfer
Cyclohepta[<i>b</i>][1,4]benzothiazines and Their Diazine Analogues. 1. Formation and Reactions of Cyclohepta[<i>b</i>][1,4]benzothiazines
作者:Kimio Shindo、Sumio Ishikawa、Tetsuo Nozoe
DOI:10.1246/bcsj.58.165
日期:1985.1
title benzothiazine (9). Although 9 was stable under basic conditions, its N-methyl cation reversibly afforded the ring-opened 2-[o-(methylamino)phenylthio]tropone in alkali. Oxidation of 9 with hydrogen peroxide in methanol underwent a rearrangement reaction to afford (exclusively) phenothiazine and its 1-formyl derivative. A similar H2O2 oxidation of 10-methoxycyclohepta[b][1,4]benzothiazine gave