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The Syntheses of 3-Substituted 4-(Pyridin-2-ylthio)indoles via Leimgruber-Batcho Indole Synthesis
Srisook, Ekaruth,Chi, Dae-Yoon Korean Chemical Society 2004 Bulletin of the Korean Chemical Society Vol.25 No.6
We have designed a new family of radioligands, 3-(amino- and hydroxymethyl)-4-(5-iodopyridin-2-ylthio)indoles, combining characteristically distinct moieties proven to impart successful binding ability in a variety of structurally diverse selective serotonin reuptake inhibitors recently published. Described in this article are the syntheses of 3-substituted 4-(5-iodopyridin-2-ylthio)-indoles, featuring successful adaptation of the modified Leimgruber-Batcho indole synthesis onto the key intermediate 1-(5-iodopyridin-2-ylthio)-2-methyl-3-nitrobenzene (6) prepared from the nucleophilic aromatic substitution of chloropyridine 7 with thiophenol 8.
Effect of Artificial Defoliation on Cane Regrowth and Fruit Development in ‘Jecy Gold’ Kiwifruit
Witchaya Srisook,임찬규,Eun Ui Oh,이경욱,김성철,송관정 한국원예학회 2015 Horticulture, Environment, and Biotechnology Vol.56 No.1
Leaves of kiwifruit have long petiole and large size, so that they are easily damaged by strong wind. This study was performed to evaluate the effect of leaves loss by typhoon damage on fruit quality and yield and new cane growth with artificial defoliation. Five-year-old ‘Jecy Gold’ kiwifruit vines grown in a plastic house were used in this study. Artificial defoliation was done on August 23 (100 days after anthesis) at the different defoliation levels, such as 0 (control), 50, 75, and 100%. Cane regrowth by axillary bud burst, cane bark carbohydrate reserve, and fruit quality and yield were investigated. Severe defoliation at 75 and 100% level showed significantly higher axillary budburst than the control and the 50% defoliation. Especially, the 100% defoliation induced a few abnormal off-season flowering. Starch and sucrose contents were significantly declined during the first 2 weeks after defoliation at the 75 and 100% defoliation. However, other soluble carbohydrate reserves including fructose, glucose, and myo-inositol were not affected significantly. Fruit drop was promoted and the mean fruit weight, firmness, and soluble solid concentrations were lower by the defoliation. Our results indicated that the loss of leaves above 50% would induce a transient shortage of assimilate supply and reduce fruit quality and yield significantly.
Witchaya Srisook,임찬규,오은의,이경욱,Herath Mudiyanselage Prathibhani Chamidha Kumarihami,김성철,박교선,송관정 한국원예학회 2016 Horticulture, Environment, and Biotechnology Vol.57 No.3
Abrupt and severe loss of leaves caused by a typhoon disrupts physiological development and metabolism in kiwifruit vines. The aim of this study was to evaluate the effects of time of defoliation on off-season flowering, vine regrowth, and fruit quality in ‘Jecy Gold’ kiwifruit. ‘Jecy Gold’ kiwifruit vines were subjected to artificial 100% defoliation on July 28 and August 29, 2014. In October, the occurrence of off-season flowering was observed only on vines that were defoliated on August 29. There was no significant difference in vine regrowth between defoliation on July 28 or August 29. However, defoliation on August 29 showed a significant reduction in soluble solid content in fruits at harvesting time. Furthermore, there was no significant difference in starch and sugar content of cane bark between the different times of defoliation. The results indicate that the floral evocation of ‘Jecy Gold’ kiwifruit might occur in August and that fruit maturation is delayed after defoliation on August 29 in comparison to defoliation on July 28.
‘제시골드’ 참다래에서 적엽 정도와 시기가 이듬 2년의 개화와 과실 품질에 미치는 영향
Witchaya Srisook,Chan-Kyu Lim,EunUi Oh,Doo-Gyung Moon,Kwan Jeong Song 한국국제농업개발학회 2016 韓國國際農業開發學會誌 Vol.28 No.4
The study aimed to evaluate the damage persistence during subsequent years in kiwifruit vines defoliated by strong wind such as typhoons. Artificial defoliation was treated on five-year-old ‘Jecy Gold’ kiwifruit vines grown in a plastic house in year 2013 and 2014 by applying four levels of defoliation, i.e., 0, 50, 75, and 100% in August 23, 2013 and 100% defoliation in July 28 and August 29, 2014, respectively. Return bloom and fruit quality were investigated in the following two years, 2014 and 2015. A significant reduction in number of flowers per shoot in the following year, 2014 was recorded for the vines with 50%, 75%, and 100% defoliations treated in 2013 compared to the control vines. The number of flowers per florescence was significantly reduced for defoliated vines. Nevertheless, the fruit quality parameters, i.e., fruit length, width, weight, firmness, TSS, acidity, and dry matter content were not significantly different for the defoliated vines compared to the control vines. The vines defoliated in 2013 at 75% and 100% levels showed a significant reduction of number of flower per inflorescence in 2015 compared to the 0% defoliation. However, the number of flowers per shoot and fruit quality were not significantly different. Also, the number of flowers per inflorescence in 2015 was significantly reduced by July 28, 2014 or August 29, 2014 defoliation compared to non-defoliated vines while the number of flowers per shoot, and fruit quality in 2015 were not significantly different between treatments and control vines. Accordance with the present findings, the flowering is considerably affected by the shortage of carbohydrate supply than the fruit quality of ‘Jecy Gold’ kiwifruit. In addition, the negative impacts of severe defoliation in flowering of ‘Jecy Gold’ kiwifruit might be persisted more than one season from the time of defoliation and consequently, the total yield might be reduced in the following seasons after defoliation.
Jang, K.S.,Shin, D.S.,Srisook, E.,Song, H.C.,Chi, D.Y. Pergamon Press 2016 Tetrahedron Vol.72 No.33
<P>Divergent functionalized 8-methoxyquinaldines were synthesized via regioselective debromination, 1,3 bromine shift process, aromatization with treatment of a strong base, nucleophilic substitution reaction at the C7 position using amines and cyanide as a nucleophile in the absence of a metal source and a catalyst from an unusual electrophilic aromatic addition (Ad(E)Ar) reaction products 7 and 8. In addition, quinaldine-7,8-dione was prepared by presence of CAN (ceric ammonium nitrate) in AcOH and H2O for 10 min at room temperature from N-(alkylamino)-8-methoxyquinalidines. During the Ad(E)Ar reaction, new stereoselective dearomatized addition products were generated via discriminative reaction routes depending on the methoxy and bromine occupancy position. The Ad(E)Ar reaction not only allowed for the functionalization of electron rich-fused heterocyclic arenes, but also provided a new synthetic route to an alternative mechanism for electrophilic aromatic substitution reactions. (C) 2016 Published by Elsevier Ltd.</P>