使用微波辐照从α-甲苯磺酰氧基固态合成2-芳基苯并[ b ]呋喃,1,3-噻唑和3-芳基-5,6-二氢咪唑并[2,1- b ] [1,3]噻唑
摘要:
2-芳酰基苯并的迅速无溶剂合成[ b ]呋喃,1,3-噻唑和3-芳基-5,6-二氢咪唑并[2,1- b ] [1,3]是从容易获得α-tosyloxyketones描述噻唑类和通过暴露于微波而加速的过程中的矿物氧化物。在固态氟化钾掺杂的氧化铝(KF–Al 2 O 3)存在下,从水杨醛和α-甲苯磺酰氧基酮很容易获得2-芳基苯并[ b ]呋喃,而蒙脱土K-10粘土从硫酰胺和α提供了1,3-噻唑。 -甲苯磺酰氧基酮。同样,亚乙基硫脲和α-甲苯磺酰氧基酮可提供桥头氮杂环,3-芳基-5,6-二氢咪唑并[2,1- b] [1,3]噻唑类,其收率很高,在传统的加热条件下不易获得。
Structure–activity relationship of dihydroimidazo-, dihydropyrimido, tetrahydrodiazepino-[2,1-b]-thiazoles, and -benzothiazoles as an acylation catalyst
synthesized by a condensation reaction of cyclic thioureas 15 and α-bromoacetophenones 14. Investigations of the acylation reactions of 1-phenylethanol with acid anhydrides in the presence of these cyclic isothiourea catalysts revealed their structure–activity relationships. Remarkable electronic effects resulting from substituent(s) on a benzo or phenyl moiety and the influence of the size of the annulating
Compounds of formula (I) or pharmaceutically acceptable salts thereof, exhibit 5-HT
1A
agonism in addition to noradrenaline reuptake inhibition and optionally also 5-HT reuptake inhibition are useful for the treatment of obesity.
Phenacylthioimidazolines and 3-aryl-5,6-dihydroimidazo[2,1-b]thiazoles with antidepressant activity
作者:C. J. Sharpe、R. S. Shadbolt、A. Ashford、J. W. Ross
DOI:10.1021/jm00292a023
日期:1971.10
Dramatic Acceleration of an Acyl Transfer-Initiated Cascade by Using Electron-Rich Amidine-Based Catalysts
作者:Nicholas A. Ahlemeyer、Emma V. Streff、Pandi Muthupandi、Vladimir B. Birman
DOI:10.1021/acs.orglett.7b03044
日期:2017.12.15
A tandem rearrangement of alpha,beta-unsaturated, thioesters into tricyclic ene-lactones fails with conventional amidine-based catalysts, but becomes possible when their electron-rich analogs are employed. A highly diastereo- and enantioselective version of this process has been developed using H-PIP 1b, a chiral catalyst prepared over a decade ago, but never utilized since its disclosure.
Prakash, Om; Rani, Neena; Goyal, Seema, Journal of the Chemical Society. Perkin transactions I, 1992, # 6, p. 707 - 710