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文章名     作者     期刊名     摘要     卷     期         如果没有找到您所需要的文献，请点击 ——此处申请     共17条记录   Convenient synthesis of 1,4-dihydro-2H-3,1-benzoxazin-2-ones by iodocyclization of t-butyl 2-vinylphenylcarbamates. [作者：Kobayashi, Kazuhiro;Fukamachi, Shuhei;Nakamura, Daizo;Morikawa, Osamu;Konishi, Hisatoshi;,期刊：Heterocycles, 页码：95-105 , 文章类型： 研究论文，,卷期：2008年75-1] Tert-Bu N-(2-vinylphenyl)carbamates underwent iodocyclization on treatment with I2 in the presence of NaHCO3 to afford 4-iodomethyl-1,4-dihydro-2H-3,1-benzoxazin-2-ones in generally good yields. Redn. of these 4-iodomet... Synthesis of cycloalkanoindoles, the carba analogs of physostigmine. [作者：Kiraly, Imre;Hornyanszky, Gabor;Kupai, Katalin;Novak, Lajos;,期刊：Heterocycles, 页码：43-56 , 文章类型： 研究论文，,卷期：2008年75-1] The title compds. I (n = 0-1) were prepd. by combined aza-Claisen rearrangement/intramol. ring-closure reaction of appropriate N-(cycloalk-1-enylmethyl)-4-methoxyanilines, followed by BBr3-mediated cleavage of methoxy gr... Studies with functionally substituted enamines: synthesis of 2-aroyl-3-dimethylamino-2-propenenitrile and their reactivity toward nitrogen nucleophiles. [作者：Al-Qalaf, Fawzia;Abdelkhalik, Mervat Mohammed;Al-Enezi, Amal;Al-Ajmi, Johara Rashed;,期刊：Heterocycles, 页码：145-156 , 文章类型： 研究论文，,卷期：2008年75-1] A facile and efficient synthesis of 2-substituted 3-dimethylamino-2-propenenitriles, RCOC(CN):CHNMe2 (I; R = 2-thienyl, 2-furyl, Ph) is described. Reaction of I with N2H4.H2O afforded 3-substituted 1H-4-pyrazolecarbonit... An efficient three-component, one-pot synthesis of new pyrimido[4,5-d]pyrimidine-2,4-diones. [作者：Dabiri, Minoo;Azimi, Seyyedeh Cobra;Arvin-Nezhad, Hamid;Bazgir, Ayoob;,期刊：Heterocycles, 页码：87-93 , 文章类型： 研究论文，,卷期：2008年75-1] New pyrimido[4,5-d]pyrimidine-2,4-(1H,3H,5H,8H)-dione derivs. were synthesized in good yields in a three-component, one-pot, and efficient process by condensation reaction of 6-amino-1,3-dimethyluracil, aldehydes, and S-... Electrooxidative cyclization of benzylideneaminothiophenols to the corresponding 2-arylbenzothiazoles. [作者：Okimoto, Mitsuhiro;Yoshida, Takashi;Hoshi, Masayuki;Hattori, Kazuyuki;Komata, Masashi;Tomozawa, Kenta;Chiba, Tomohito;,期刊：Heterocycles, 页码：35-42 , 文章类型： 研究论文，,卷期：2008年75-1] Several 2-(benzylidenamino)thiophenols were electrochem. oxidized in MeOH contg. NaOAc as the supporting electrolyte, to afford the corresponding 2-arylbenzothiazoles. The reaction proceeded via intramol. cyclization in... Sulfuric acid mediated heterocyclization of ortho-cyanomethylnitroarenes to benzo[c]isoxazoles and fused benzo[c]isoxazoles. [作者：Bakavoli, Mehdi;Pordel, Mehdi;Rahimizadeh, Mohammad;Jahandari, Pooneh;Seresht, Esmaeel Rezaei;,期刊：Heterocycles, 页码：165-171 , 文章类型： 研究论文，,卷期：2008年75-1] The vicarious nucleophilic substitution of hydrogen (VNS) is used as the key step to convert 1-benzyl- and 1-methyl-5-nitrobenzimidazole into the resp. 4-cyanomethyl derivs. Conc. H2SO4-mediated heterocyclization of the... Synthesis of 2,4-dibromopyridine and 4,4'-dibromo-2,2'-bipyridine. [作者：Efficient usage in selective bromine-substitution under palladium-catalysis. Garcia-Lago, Ramon;Alonso-Gomez, Jose-Lorenzo;Sicre, Cristina;Cid, Maria-Magdalena;,期刊：Heterocycles, 页码：57-64 , 文章类型： 研究论文，,卷期：2008年75-1] An efficient method for prepn. of 2,4-dibromopyridine and 4,4'-dibromo-2,2'-bipyridine from 2-bromo-4-nitropyridine N-oxide and 4,4'-dinitro-2,2'-bipyridine N,N'-dioxide, resp., via a tandem nucleophilic substitution - N... A concise approach to (?-tubifoline based on the palladium-catalyzed cross-coupling reaction of indolylborate. [作者：Ishikura, Minoru;Takahashi, Norinobu;Yamada, Koji;Abe, Takumi;,期刊：Heterocycles, 页码：107-118 , 文章类型： 研究论文，,卷期：2008年75-1] The palladium-catalyzed tandem cyclization-cross-coupling protocol using 1H-indol-2-yl trialkyl borate (indolyl borate) proved to be a versatile approach to the generation of 2-(4-piperidylmethyl)indole, which was succes... Synthesis of vinca alkaloids and related compounds. Part 109. An intramolecular [4+2] cycloaddition mediated biomimetic synthesis of (?-iboxyphylline. [作者：Toth, Florian;Kalaus, Gyorgy;Pipa, Gergely;Greiner, Istvan;Szollosy, Aron;Rill, Attila;Gomory, Agnes;Hazai, Laszlo;Szantay, Csaba;,期刊：Heterocycles, 页码：65-76 , 文章类型： 研究论文，,卷期：2008年75-1] The pentacyclic alkaloid iboxyphylline could be synthesized by an intramol. [4+2] cycloaddn. of intermediate I, which was obtained from tryptamine II and OCH(CH2)2CH(OAc)CHMeCO2Me. After full epimerization of III the cy... A convenient one-pot preparation of N-substituted 4-phenylpiperidines. [作者：Asano, Shigehiro;Ban, Hitoshi;,期刊：Heterocycles, 页码：183-188 , 文章类型： 研究论文，,卷期：2008年75-1] N-Substituted 4-phenylpiperidines were readily synthesized by one-pot cyclization of diols with amines via bis-triflate intermediates. The new synthesis under mild conditions gave various N-substituted 4-phenylpiperidin... On the tautomerism of cinnolin-4-ol, cinnoline-4-thiol, and cinnolin-4-amine. [作者：Holzer, Wolfgang;Eller, Gernot A.;Schoenberger, Simeon;,期刊：Heterocycles, 页码：77-86 , 文章类型： 研究论文，,卷期：2008年75-1] Detailed NMR spectroscopic investigations (1H, 13C, 15N) with cinnolin-4-ol (1) reveal this compd. to exist exclusively in the cinnolin-4(1H)-one form in deuteriodimethyl sulfoxide soln. This finding is confirmed by com... Heteropentalene mesomeric betaines of type C: progress since the early 1980s. [作者：Moderhack, Dietrich;,期刊：Heterocycles, 页码：1-33 , 文章类型： 研究论文，,卷期：2008年75-1] This review briefly summarizes the achievements made in the last 25 years. Synthesis, properties, and reactivity are dealt with here. AZINYL SULFIDES. CII. 1H NMR sulfinyl group substituent effects of dithiinodiazine S-oxides as a key for structure assignment of parent dithiinodiazines. [作者：Maslankiewicz, Andrzej;Maslankiewicz, Maria J.;Zieba, Andrzej;Marciniec, Krzysztof;,期刊：Heterocycles, 页码：119-129 , 文章类型： 研究论文，,卷期：2008年75-1] 1,4-Dithiinodipyridine 1 (I) was prepd. by redn. of 4-chloro-3-chlorosulfonylpyridine (8) with HI/H3PO3 system. Sulfur-assisted thermal isomerization of 1 resulted in a mixt. of 1 and 2 (II). Treatment of dithiinodiazin... Densispicnins A and B, two unusual monoterpenes from Pedicularis densispicad Franch. [作者：Chu, Hong-biao;Luo, Du-qiang;Tan, Ning-hua;Tian, Xuan;,期刊：Heterocycles, 页码：177-181 , 文章类型： 研究论文，,卷期：2008年75-1] Two unusual monoterpenes, densispicnins A (I), B (II), together with the four known monoterpenes, mussaenoside, yuheinoside, mussaenin A, argyol, were isolated from the whole plant of Pedicularis densispica Franch. The ... A new cyclo-thioglucoside from the seeds of Raphanus sativus L. [作者：Feng, Bao-Min;Duan, Li-Xin;Tang, Ling;Pei, Yue-Hu;Wang, Yong-Qi;,期刊：Heterocycles, 页码：173-176 , 文章类型： 研究论文，,卷期：2008年75-1] seeds of Raphanus sativus L.. The structure of raphanuside was detd. on the basis of extensive spectroscopic means including HR-FAB-MS, 1D and 2D NMR expts. Three mexicanolides from the root bark of Entandrophragma angolense. [作者：Kipassa, Nsiama Tienabe;Okamura, Hiroaki;Doe, Matsumi;Morimoto, Yoshiki;Iwagawa, Tetsuo;Nakatani, Munehiro;,期刊：Heterocycles, 页码：157-164 , 文章类型： 研究论文，,卷期：2008年75-1] Three new mexicanolide-type rings B,D-seco limonoids (angolensin A(I)-C) were isolated together with four known rings B,D-seco compds., Me angolensate, secomahoganin, 3b-hydroxy-3-deoxycarapin, and xyloccensin K from the...