Palladium-catalyzed regiospecific tandem allylation of 2-aminophenols using 2-butene-1,4-diol
摘要:
The direct activation of C-O bonds in 2-butene-1,4-diol by palladium complexes has been accelerated by carrying out the reactions in the presence of a titanium reagent. Palladium-catalyzed regiospecific tandem allylation of 2-aminophenols with 2-butene-1,4-diol leads to 3,4-dihydro-2-vinyl-2H-1,4-benzoxazines. (C) 2004 Elsevier Ltd. All rights reserved.
A process for preparing rhodamines represented by the following general formula (I) or (II):
wherein R₁, R₂, and R₃ are independently hydrogen or a lower alkyl, group, but R₁ and R₂ are not both hydrogen which comprises subjecting phthalic anhydride and N-substituted-m-aminophenols represented by the following general formula (III):
wherein R₁, R₂, and R₃ have the above-described meanings, to condensation reaction in one or more organic solvents selected from the group consisting of halogentated and/or alkylated aromatic hydrocarbons or aliphatic hydrocarbons.
METHOD FOR PRODUCING 1-(4-HYDROXYPHENYL)-4-(4-TRIFLUOROMETHOXYPHENOXY)PIPERIDINE OR SALT THEREOF
申请人:OTSUKA PHARMACEUTICAL CO., LTD.
公开号:US20180065931A1
公开(公告)日:2018-03-08
The present invention provides a method for producing 1-(4-hydroxyphenyl)-4-(4-trifluoromethoxyphenoxy)piperidine or a salt thereof, the method including the step of heating hydroquinone and 4-(4-trifluoromethoxyphenoxy)piperidine. This method can produce 1-(4-hydroxyphenyl)-4-(4-trifluoromethoxyphenoxy)piperidine or a salt thereof in an industrially advantageous manner.
Verfahren zur Herstellung von Alkyl- bzw. Arylthiomethyl-phenolen
申请人:BAYER AG
公开号:EP0011091A1
公开(公告)日:1980-05-28
Die vorliegende Erfindung betrifft ein neues Verfahren zur Herstellung von Alkyl- bzw. Arylthiomethylphenolen der Formel I
das dadurch gekennzeichnet ist, daß man Hydrooxymethylphenole der Formel II
mit Mercaptanen oder Thiophenolen bei Temperaturen von 20 bis 200 , gegebenenfalls in Anwesenheit eines Verdünnungsmittels umsetzt.
本发明涉及一种制备式 I 的烷基或芳基硫代甲基苯酚的新工艺,其特征在于:式 II 的氢氧基甲基苯酚是由烷基或芳基硫代甲基苯酚制备而成。
其特征在于:式 II 的羟甲基苯酚与硫醇或噻吩酚在 20℃、20℃、20℃ 和 20℃条件下反应。
与硫醇或噻吩酚反应,反应温度为 20 至 200℃,可选择在稀释剂存在下进行。
Acrylamide derivatives
申请人:Nippon Paint Co., Ltd.
公开号:EP0177122A2
公开(公告)日:1986-04-09
A compound of the formula
wherein R is H or C1-8 alkyl; X is -0-, -S-, -NH- or -N(C1-8 alkyl)-; and Y is the residue of an active hydrogen atom-containing compound (excluding -X-H therefrom).
Such compounds can be dissolved in an organic solvent having a solubility parameter of not less than 8. They can impart excellent physical properties to a polymer produced therefrom.
式中的化合物
其中 R 是 H 或 C1-8 烷基;X 是 -0-、-S-、-NH- 或 -N(C1-8烷基)-;Y 是含活性氢原子化合物的残余物(不包括其中的 -X-H)。
这些化合物可以溶解在溶解度不小于 8 的有机溶剂中。
Process for preparing N-alkylaminophenols
申请人:SUMITOMO CHEMICAL COMPANY, LIMITED
公开号:EP0218350A1
公开(公告)日:1987-04-15
A process for preparing an N-alyklaminophenol represented by the formula (III):
wherein R, represents a hydrogen atom or an alkyl group having from 1 to 6 carbon atoms; and R2 represents an alkyl group having from 1 to 6 carbon atoms, which comprises reacting an aminophenol represented by the formula (I):
wherein R1 is as defined above, with an alkyl halide represented by the formula (II):
wherein R2 is as defined above; and X represents a halogen atom, at 80°-120 °C at 3-30 kg/cm2G pressure in an autoclave in the presence of water under heat and pressure, using ammonia as an acid scavenger,
1-2 mols of alkyl halide are used per mol of alkyl group and 1-3 mols ammonia per mol compound (I).
The ammonia is preferably introduced continuously while the pH is 4-10, and with 0.05-4 parts by wt. water per wt. of aminophenol.