Synthesis and Plant Growth Stimulating Action of 2-Amino-6-methylpyrimidine-4(3H)-thione Derivatives
摘要:
A series of new pyrimidine derivatives, including those containing an azole or azine heterocycle linked through a sulfur atom or a thiomethylene group, was synthesized based on 2-amino-6-methylpyrimidine-4(3H)-thione. The synthesized compounds exhibited a pronounced stimulating effect on plants growth in the range of 43-96% compared to heteroauxin.
Dimerisierende Kondensation von Alkylidenpropandinitrilen und Alkylidencyanamiden. - Ein allgemeines Syntheseprinzip für Anilin-, Aminopyridin- und Aminopyrimidin-Derivate
作者:Klaus Hartke、Michaela Sauerbier、Wolfgang F. Richter
DOI:10.1002/ardp.19923250506
日期:——
Diebasenkatalysierte dimerisierende Kondensation von (α‐Methylthioalkyliden)propandinitrilen (z.B. 8) liefert 2‐Aminobenzol‐1,3‐dicarbonitrile (z.B. 13), von (α‐Methylthioalkyliden)cyanamid (z.B. 14) 2‐Aminopyrimidine (z.B. 16, 37). Die gemischte Kondensation von (α‐Aminoalkyliden)propan‐dinitrilen (z.B. 20) mit (α‐Methylthioalkyliden)cyanamiden führt zu Pyrimidin‐5‐carbonitrilen (z. B. 23, 28, 40)
Ultrasound-assisted synthesis and preliminary bioactivity of novel 2H-1,2,4-thiadiazolo[2,3-a]pyrimidine derivatives containing fluorine
作者:Mao Rong Wang、Lin Jiang、Shao Fang Zhou、Ze Yuan Zhang、Zeng Chen Ji
DOI:10.1016/j.cclet.2012.03.005
日期:2012.5
Eight novel 5,7-disubstituted-2-5-methyl-3-(4-trifluoromethylphenyl)isoxazol-4-ylcarbonylimin} -2H-1,2,4-thiadiazolo[2,3-a]pyrimidines were synthesized by multi-step reactions in yields 68-85%. Reactions were carried out either by ultrasound irradiation or conventional method, and found it was faster and more efficient under ultrasonic irradiation. Preliminary herbicidal activities against Echinochloa crus-galli, Digitaria sanguinalis and Chenopodium serotinum were also evaluated by flat-utensil method, and the results indicated that the target compounds exhibited significant activities, some were even higher than the control herbicide. (C) 2012 Lin Jiang. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
The Joint Influence of Agricultural and Nonfarm Factors on Real Estate Values: An Application to the Mid‐Atlantic Region
作者:Ian W. Hardie、Tulika A. Narayan、Bruce L. Gardner
DOI:10.1111/0002-9092.00141
日期:2001.2
AbstractCounty level farmland and residential housing values are estimated for the Mid‐Atlantic region as a function of farm returns, developed land values, household incomes, population densities, and location. Results are based on the hypothesis that farmland owners anticipate land development and that nonfarm factors are important determinants of farmland prices. Response of farmland prices to change in farm returns is found to be inelastic and relatively uniform in rural and urban counties. Response to nonfarm factors is found to be more elastic and substantially greater in rural counties.
Heterocyclization of acetylketeneN,S-acetals with benzoyl cyanamide
作者:V. A. Dorokhov、A. V. Komkov、V. S. Bogdanov
DOI:10.1007/bf02503799
日期:1997.11
N-Unsubstituted mono-and diacetylketene N,S-acetals undergo cyclization with benzoyl cyanamide to form 2-amino-4-methylthiopyrimidine derivatives.