Synthesis of 2,3-Dihydrobenzo[b]thiophen-3-amine 1,1-Dioxide Derivatives via LDA-Mediated Cyclization of o-(Alkylsulfonyl)benzyl Azides with Denitrogenation
摘要:
A new and efficient method for the synthesis of 2,3-dihydrobenzo[b]thiophen-3-amine 1,1-dioxide derivatives has been developed. Thus, treatment of o-(alkylsulfonyl)benzyl azides, which are readily obtainable from commercially available starting materials by easily operational sequences, with lithium diisopropylamide (LDA) in THE at -78 degrees C gives, after aqueous workup, 2,3-dihydrobenzo[b]thiophen-3-amine 1,1-dioxides. These products can be isolated in moderate to fair yields after N-protection with acylating agents.
One‐Pot Synthesis of 3‐Halo‐2‐organochalcogenylbenzo[
<i>b</i>
]chalcogenophenes from 1‐(2,2‐Dibromovinyl)‐2‐organochalcogenylbenzenes
作者:Eduardo Q. Luz、Gabriel L. Silvério、Diego Seckler、David B. Lima、Francielli S. Santana、Ronilson V. Barbosa、Caroline R. Montes D'Oca、Daniel S. Rampon
DOI:10.1002/adsc.202001586
日期:2021.5.18
A transition-metal-free one-pot synthesis of 3-halo-2-organochalcogenylbenzo[b]chalcogenophenes has been developed using 1-(2-organochalcogenylethynyl)-2-butylchalcogenylbenzenes generated in situ from 1-(2,2-dibromovinyl)-2-organochalcogenylbenzenes and diorganoyl dichalcogenides. By this method, several 2,3-disubstituted benzo[b]chalcogenophenes were prepared in yields of 48–93%. The mechanistic
使用由1-(2,2-二溴乙烯基)就地生成的1-(2-有机氧代乙炔基乙炔基)-2-丁基硫代碳酰苯开发了一种无过渡金属的一锅合成3-卤代-2-有机硫代烷基苯并[ b ]硫属茂金属。 -2-有机锡烷基苯和二有机基二硫代双氰化物。通过这种方法,制备了2,3-二取代的苯并[ b ]硫属元素oph,产率为48-93%。机理研究表明,在此一锅法的第一步中,含有相邻硫族元素原子的硫属元素炔的形成涉及由1-(2,2-二溴乙烯基)-2-有机碳烷基苯和弱碱形成的乙炔根阴离子。
Synthesis of 2-phenylthiazolidine derivatives as cardiotonic agents. I. 2-Phenylthiazolidine-3-thiocarboxamides.
A series of novel 2-phenylthiazolidine-3-thiocarboxamides (II) was synthesized and tested for positive inotropic activity in the isolated guinea pig heart and in anesthetized dogs. Reaction of the benzaldehydes (VI, XI, XIV and XV) with cysteamine followed by treatment with isothiocyanates readily gave II. Structure-activity relationships were investigated by varying the structural parameters. N-Methyl-2 -phenylthiazolidine-3-thiocarboxamides having an ortho substituent such as a Me or OMe group exhibited significant positive inotropic action, which was not blocked by propranolol. Among the various ortho-alkoxyphenyl derivatives synthesized, the 2- (2- (3- (4-phenylpiperazino) propoxy) phenyl) derivative (I67) was found to exhibit more potent and longerlasting activity than amrinone without any significant effect on heart rate or blood pressure
BF
<sub>3</sub>
Mediated [1,5]‐Hydride Shift Triggered Cyclization: Thioethers Join the Game
作者:Elvira R. Zaitseva、Alexander Yu. Smirnov、Vladimir I. Timashev、Vadim I. Malyshev、Ekaterina A. Zhigileva、Andrey A. Mikhaylov、Michael G. Medvedev、Nadezhda S. Baleeva、Mikhail S. Baranov
DOI:10.1002/ejoc.202200547
日期:2022.7.7
1,5-Hydride shift triggered the cyclization of 2-(2-(benzylthio)benzylidene)malonates to thiachromanes, which are presented for the first time. Boron trifluoride as a reaction promotor is the key of this C−H activation success. Quantum chemical calculations have shown that the studied reaction proceeds via a O–BF2–O chelate, which was confirmed by NMR-analysis.
2-Pyridyl-1,4-dihydropyridine, Verfahren zu ihrer Herstellung sowie ihre Verwendung als Arzneimittel
申请人:BAYER AG
公开号:EP0001054A2
公开(公告)日:1979-03-21
Die vorliegende Erfindung betrifft neue 2-Pyridyl-1 4-dihydropyridine, mehrere Verfahren zu ihrer Herstellung sowie ihre Verwendung als Arzneimittel, vorzugswelse als gefäßesinflussende Mittel. insbosondore @ Coronarmittel.
1-N-Aryl-1,4-dihydropyridine, Verfahren zu ihrer Herstellung und ihre Verwendung als Arzneimittel
申请人:BAYER AG
公开号:EP0002231A1
公开(公告)日:1979-06-13
1-N-Aryl-1,4-dihydropyridine der Formel
in welcher
R' für einen gegebenenfalls substituierten Arylrest steht,
R2 und R6 für gegebenenfalls substituiertes Alkyl oder Alkoxyalkyl stehen,
R3 und R4 gleich oder verschieden, jeweils für gegebenenfalls substituiertes Alkyl, Alkenyl oder Alkinyl stehen,
X für einen gegebenenfalls substituierten Alkyl-oder Arylrest steht oder für gegebenenfalls substituiertes Aralkyl, Styryl, Cycloalkyl, Cycloalkenyl, Chinolyl, lsochinolyl, Pyridyl, Pyrimidyl, Furyl, Thienyl oder Pyrryl steht,
mehrere Verfahren zu ihrer Herstellung sowie ihre Verwendung als Arzneimittel, insbesondere als kreislaufbeeinflussende Mittel.