- 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...
- 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...
- 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...
- 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...
- 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...
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