查询词典 annulation

Photoinduced reactions of 1 with 15, 16 and 19 gave the corresponding annulation products 21 (58%), 30 (71%) and 35 (87%) directly in one pot sequential reactions.

二氯香豆素（1）可分别与2-和3-苯基苯并呋喃以及2-甲基-4-苯基噻唑在光照条件下经一锅内的连续反应直接合成增环产物21（58％），30（71％）和35（87％）。

Part 2. Annulation reaction of 3, 4-dichlorocoumarin (1) and 3, 4-dichloromaleimide (8) by a new general annulation strategy developed in this group with 2-phenylbenzofuran (15), 3-phenylbenzofuran (16), 2, 5-diphenyloxazole (17), 2, 5-diphenylthiazole (18), 2-methyl-4-phenylthiazole (19) and 2, 3-dimethoxy-1, 3-butadiene (40) were investigated.

二。在本课题组前一阶段提出的从二氯代环烯酮与1，1-二芳基乙烯的光化反应以及光化反应中得到的环丁烷产物的连续电环化反应对3，4-二氯马来酰亚胺以及3，4-二氯香豆素进行增环反应的工作基础上，研究了3，4-二氯香豆素（1）和3，4-二氯马来酰亚胺（8）与5个α-苯基取代的环烯烃2-苯基苯并呋喃（15），3-苯基苯并呋喃（16），2，5-二苯基噁唑（17），2，5-二苯基噻唑（18），2-甲基-4-苯基噻唑（19），以及一个丁二烯——2，3-二甲氧基丁二烯（40）进行的芳香族增环反应。

Photoreactions of 8 with 15-19, on the other hand, furnished the corresponding [2+2] cyclobutane products and the annulation products together.

二氯马来酰亚胺（8）与15—19的光化反应中则分别得到相应[2+2]的环丁烷产物和增环产物，在与19的反应中，还得到由环丁烷产物脱氯化氢后得到的环丁烯开环的二烯产物。

A one-pot synthesis of indoles by a palladium-catalyzed annulation of ortho haloanilines and aldehydes is reported by the group of Zhu J.

一个锅合成吲哚的钯催化圆环邻haloanilines报道，由77醛朱 J查看。

A series of 3--1,2,3-triazolo[4,5-d]pyrimidin-7-ones were synthesized via the tandem Aza-Wittig reaction annulation.

用串联的氮杂Wittig关环反应合成了一系列3--1，2，3-三唑[4，5-d]嘧啶-7-酮。

The strategy toward the synthesis of spirotryprostatin B is focused on MgI2-catalyzed intramolecular annulation reaction of cyclopropanyl spiroox--indole and imine.

以天然产物的全合成为目标，设计了MgI_2催化的螺氧吲哚化合物与亚胺分子内环合反应，构建目标分子骨架的策略。

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A mechanism involved in the second [5 + 1] annulation step, includinga formal [5 + 1] annulation and accompanied chlorovinylation, chloroformylation,amination and aromatization reactions, is proposed.

并对第二步反应机理进行了推测，其中包括了一个一般的[5 + 1]加成反应及伴随此加成反应而发生的氯化乙烯化，氯化甲酰化，氨化和芳构化反应。

In the first step of thedouble annulation route, 2-amino-3-carbamoyl-5,6-dihydro-4-pyridones 2 werecreated in high to excellent yields by a formal [5C + 1N] annulation reaction ofketene--acetals 1 with ammonia.

第一步，二硫缩烯酮1和氨源通过[5C + 1N]加成反应产率极高的得到了2-氨基-3-氨基甲酰基-5，6-二氢-4-吡啶酮2。

The annulation of stilbene compounds were studied. Phenanthrene derivates-interme diates of tylophorine were synthesized by annulation from-2,3-bis(3,4-dimethoxyphen yl)acrylic acid and-2,3-bis(3,4-dimethoxyphenyl) acrylonitrile with phenyliodine diace tate as a friendly and high efficient catalyzer.The route was first reported, whose application foreground would be promising.The catalyzer will be used to study of synthesi- zing a series of new phenanthrenes.

本文还探索了简单类化合物关环反应，并研究出用廉价高效对环境友好的催化剂-二乙酸碘苯成功地将类化合物－3，4-二甲氧基-α-(3，4-二甲氧苯基)-肉桂酸和-2-(3，4-二甲氧苯基)-3-(3，4-二甲氧苯基)-丙烯关环形成相应的菲环衍生物－娃儿藤碱重要中间体，此方法在国内尚属首次，具有重要的应用价值，此外可用此催化剂研究一系列类化合物的关环反应。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。