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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72条记录   Enantiomeric synthesis of 2-C-methyl-D-erythritol 2,4-cyclodiphosphate. [作者：Narayanasamy, Prabagaran;Crick, Dean C.;,期刊：Heterocycles, 页码：243-247 , 文章类型： 研究论文，,卷期：2008年76-1] synthesized from 1,2-O-isopropylidene-a-D-xylofuranose with facile phosphorylation in good yield. Subsequently, the synthesized enantiomerically pure I can be used as a substrate in IspG assays to identify inhibitors th... Studies on synthesis of OSW-1 analog with thiazole ring at side chain employing Wittig rearrangement. [作者：Tsubuki, Masayoshi;Matsuo, Sohichiro;Honda, Toshio;,期刊：Heterocycles, 页码：257-265 , 文章类型： 研究论文，,卷期：2008年76-1] OSW-1 analog with thiazole at the side chain was synthesized employing a tandem Williamson etherification and [2,3]-Wittig rearrangement, which provided a one-pot producer for the formation of (20S)-22-hydroxy steroids f... Formal total synthesis of (-)-physostigmine. [作者：Asakawa, Kaori;Noguchi, Naoyoshi;Nakada, Masahisa;,期刊：Heterocycles, 页码：183-190 , 文章类型： 研究论文，,卷期：2008年76-1] The formal total synthesis of (-)-physostigmine is described via (R)-2-(2-chlorophenyl)-2-(methoxycarbonyl)propanoate (99% ee), newly prepd. by pig liver esterase (PLE) mediated asym. hydrolysis of the corresponding dies... Photodimerization of pyrido[2,1-a]isoindol-6(4H)-one. [作者：Paquette, Leo A.;Dura, Robert D.;Gallucci, Judith C.;,期刊：Heterocycles, 页码：129-132 , 文章类型： 研究论文，,卷期：2008年76-1] When subjected to acetone-sensitized irradn., the title compd. V undergoes near-quant. self-coupling to give an uncommon [4+2] dimer VI, whose reaction with several oxidants demonstrated the enamide double bond of the ph... Asymmetric synthesis of the ABCD ring system of daphnilactone B via a tandem, double intramolecular, [4+2]/[3+2] cycloaddition strategy. [作者：Denmark, Scott E.;Nguyen, Son T.;Baiazitov, Ramil Y.;,期刊：Heterocycles, 页码：143-154 , 文章类型： 研究论文，,卷期：2008年76-1] An asym. synthesis of the ABCD ring system of daphnilactone B is described. The synthesis features a tandem, double intramol., [4+2]/[3+2] cycloaddn. of a highly functionalized, enantiomerically enriched nitro alkene to... Regioselective introduction of electrophiles into piperidine derivatives at the 4-position. [作者：Onomura, Osamu;Fujimura, Noriyuki;Oda, Takahisa;Matsumura, Yoshihiro;Demizu, Yosuke;,期刊：Heterocycles, 页码：177-182 , 文章类型： 研究论文，,卷期：2008年76-1] Regioselective introduction of various electrophiles (aldehydes, ketones, and imines) into piperidine skeleton at the 4-position was achieved with a catalytic amt. of Pd(OAc)2/PPh3 in the presence of excess Et2Zn. In ad... Phosphinomethyl-oxazolines as efficient ligands for the iridium-catalyzed enantioselective hydrogenation of unfunctionalized tetrasubstituted olefins. [作者：Schrems, Marcus G.;Neumann, Eva;Pfaltz, Andreas;,期刊：Heterocycles, 页码：771-781 , 文章类型： 研究论文，,卷期：2008年76-1] Iridium-catalyzed enantioselective hydrogenation has become the method of choice for the enantioselective redn. of unfunctionalized olefins. In particular, tetrasubstituted olefins are interesting substrates, which allo... Marchantiophyta (liverworts): rich sources of macrocyclic bis(bibenzyls). [作者：Asakawa, Yoshinori;Toyota, Masao;Hashimoto, Toshihiro;Tori, Motoo;Nagashima, Fumihiro;Harinantenaina, Liva;,期刊：Heterocycles, 页码：99-127 , 文章类型： 研究论文，,卷期：2008年76-1] bis(bibenzyls) which show interesting biol. activity such as antimicrobial, antifungal, antiobesity and muscle relaxing activity etc. and are of very valuable for the chemosystematic and evolutionary study of the Marchan... Simultaneous formation of antiparallel b-sheet-like and type II b-turn-like structures based on introduction of dipeptide chains with heterochiral sequence into ferrocene scaffold. [作者：Moriuchi, Toshiyuki;Nagai, Takayoshi;Fujiwara, Takashi;Honda, Nami;Hirao, Toshikazu;,期刊：Heterocycles, 页码：595-603 , 文章类型： 研究论文，,卷期：2008年76-1] (Organometallic and Organometalloidal Compounds) Section Simultaneous formation of antiparallel b-sheet-like and type II b-turn-like structures through the intramol. hydrogen bonds was achieved by the sym. introduction o... Dechalcogenation of pentachalcogenadistannabicyclo[3.1.1]heptanes. [作者：Saito, Masaichi;Hashimoto, Hizuru;Tajima, Tomoyuki;,期刊：Heterocycles, 页码：515-520 , 文章类型： 研究论文，,卷期：2008年76-1] Pentathia- and pentaselena-distannabicyclo[3.1.1]heptanes reacted with tributylphosphine to afford tetrathia- and tetraselena- distannabicyclo[2.1.1]hexanes, resp. The novel heterocyclic framework of a tetrathiadistanna... Selective synthesis of cyclic phosphoric acid diesters through oxorhenium(VII)-catalyzed dehydrative condensation of phosphoric acid with alcohols. [作者：Sakakura, Akira;Sakuma, Masayuki;Katsukawa, Mikimoto;Ishihara, Kazuaki;,期刊：Heterocycles, 页码：657-665 , 文章类型： 研究论文，,卷期：2008年76-1] The selective synthesis of phosphate diesters was achieved through the direct catalytic dehydrative condensation of H3PO4 with 2 equiv. of alcs. The present method works esp. well for the synthesis of cyclic phosphate d... Syntheses, structures, and properties of bithiophenophanes bridged at 1,8-positions of naphthalenes. [作者：Nakao, Kazumi;Nishiuchi, Tomohiko;Iyoda, Masahiko;,期刊：Heterocycles, 页码：727-745 , 文章类型： 研究论文，,卷期：2008年76-1] The 2,2'-bithiophenophanes I (R = H, Et) bridged at the 1,8-positions of naphthalenes together with their linear dimers, trimers and a tetramer were synthesized by the homo-coupling of 1,8-di(5-lithio-2-thienyl)naphthale... Synthesis, molecular structure, and oxidation behavior of exhaustively methylated azacalix[6]arene. [作者：Ishibashi, Koichi;Tsue, Hirohito;Takahashi, Hiroki;Tokita, Satoshi;Matsui, Kazuhiro;Tamura, Rui;,期刊：Heterocycles, 页码：541-550 , 文章类型： 研究论文，,卷期：2008年76-1] The mol. structure and oxidn. behavior of an exhaustively methylated aza calix[6]arene were investigated with the intention of developing high-spin materials. The aza calix[6]arene adopted a distorted 1,3-alternate conf... Synthesis and mercurophilic properties of dithiocrown ethers having an azulene pendant. [作者：Kubo, Kanji;Mori, Akira;Nishimura, Tatsuya;Kato, Nobuo;,期刊：Heterocycles, 页码：209-214 , 文章类型： 研究论文，,卷期：2008年76-1] Dithiacrown ethers I (n = 1-3) having an azulene pendant were synthesized by regioselective reaction of appropriate 8,8-dicyanoheptafulvenes with malononitrile in the presence of NaOEt to examine their ability for extn. ... Facile synthesis of (2-benzimidazolyl)-1-azaazulenes, (2-benzothiazolyl)-1-azaazulenes, and related compounds and evaluation of their anticancer in vitro activity. [作者：Yamauchi, Noriko;Fujii, Hiroyuki;Kakehi, Akikazu;Shiro, Motoo;Kurosawa, Masaki;Konakahara, Takeo;Abe, Noritaka;,期刊：Heterocycles, 页码：617-634 , 文章类型： 研究论文，,卷期：2008年76-1] Facile syntheses of 2-, 3,- and 8-(2-benzimidazolyl)-1-azaazulenes and 2-, 3-, and 8-(2-benzothiazolyl)-1-azaazulenes were achieved by the condensation of corresponding 1-azaazulenecarbaldehydes with o-phenylenediamine a... Synthesis of 2,5-diaminopyrazine derivatives via dimerization of 2H-azirin-3-amines. [作者：Mekhael, Maged K. G.;Linden, Anthony;Heimgartner, Heinz;,期刊：Heterocycles, 页码：689-698 , 文章类型： 研究论文，,卷期：2008年76-1] 2-Methyl-3-(methylphenylamino)-2H-azirine (I) was prepd. conveniently by subsequent treatment of N-methyl-N-phenylpropanamide in THF with LDA, (PhO)2POCl (DPPCl), and NaN3 in DMF. In the absence of nucleophiles, the rea...