酰氧基

The rate of formation of the four acyl-L-serine anilide was studied.

比较了四种酰基-丝氨酸的酰苯胺合成的速度。N-苯甲氧羰酰-L-丝氨酸酰苯胺最快；N-苯甲酰-，N-正己酰-其次；N-异戊酰-最慢。

In this thesis, a convenient and efficient synthesis of highly functionalizeddihydropyrido[2,3-d]pyrimidines via a double [5 + 1] annulation strategy startingfrom easily available α-alkenoyl-α-carbamoyl ketene--acetals 1 and cheapreagents (NH4OAc, DMF, and POCl3) has been developed.

本论文探索了一种简便有效的合成高度官能化的二氢吡啶并[2，3-d]嘧啶的方法，此方法由易得的α-乙酰基-α-氨基乙酰基二硫缩烯酮1和便宜的试剂(醋酸铵，二甲基甲酰胺和三氯氧磷)通过两步[5 + 1]加成而实现。

Target compounds have been synthesized by condensation of the aromatic nucleus and amino heterocylcle with acyl isocyanates or acylisothiocyanates in absolutely anhydrous and aprotic solvent.

为了寻找高活性的农药品种，利用生物等排原理和亚结构连接法，对脲类化合物的母体结构进行了修饰，将芳氧羧酸类及吡唑环引入酰基脲母体结构中，利用酰基异氰酸酯与杂芳环胺类化合物在无水非质子溶剂中发生亲核加成反应，合成了四个系列21种新的酰基脲类目标化合物。

In some cases, its epimer 4 was also obtained. 22 compounds were synthesized, among them 18 were new.3. Using the intramolecular Pictet-Spengler reaction to form the pentacyclic skeleton of Et-743, the byproducts 25 were obtained under various conditions. The structures of them were determined to be 1, 2-dihydro-isoquinoline compounds, and the mechanism of the reaction was proposed.B. The synthesis of the analogs of Et-743Because of the failure of removing the protective groups in compounds 14, the synthetic strategy was adjusted.

对于苄基保护的羟基化合物13a，顺利得到化合物30，然后与不同的羧酸反应得到18个酯化合物33-50；对于苄氧羰基保护的氨基化合物13b，由于脱除保护基的化合物31在空气中不稳定，所以我们采取不经分离纯化，直接与羧酸反应得到酰胺化合物53-62，然后再分别对其C-21位的羰基进行还原氰基化，得到10个酰胺目标化合物63-72，另外，我们还对羟基转化为氨基的反应进行了探索。3。

In this dissertation, two derivatives of aniline containing polyoxyethylene substituent m-phenylene diamino formyl alkylenediamine poly acetate and poly-3-aminobenzoate were designed and synthesized. And then, comb-shaped polyaniline grafted by PEO were prepared by chemical oxidation copolymerization. The structure of copolymers were characterized by FTIR, ultraviolet-visible spectrum, elemental analysis and TEM etc..

本文在设计并合成两种含聚氧乙烯取代基的苯胺衍生物——间苯二氨基甲酰己二氨基甲酸聚氧乙烯乙酸酯和3-聚氧化乙烯单甲醚基苯胺的基础上，采用化学氧化法将它们与苯胺进行共聚，制备出了聚氧乙烯接枝聚苯胺的梳型共聚物。

New compounds of the type of N--N'-(2,4-dichlorophenyloxyacetyl)-semicarbazides were synthesized by a series of reactions of preparing organic isocyanates by Curtius rearrangement with 2,4- dichloro aryloxyacetic acid hydrazide using one-pot procedures.

以芳香取代酸为原料，用Curtius重排的方法合成异氰酸酯，直接与2，4-二氯苯氧乙酰肼作用，一锅法合成了4种N-取代芳基-N'-(2，4-二氯苯氧乙酰基)氨基脲类化合物。

This invention is directed to the-tartaric acid salt of 2-amino-N-{1-(2,4-difluoro-benzyloxymethyl)-2-oxo-2-3-oxo-3a-pyridin-2-ylmethyl-2-(2,2,2-trifluoroethyl-2,3,3a, 4,6,7-hexahydro-pyrazolo(4,3-c) pyridin-5-yl-ethyl}-2-methyl-propionamide which is a growth hormone secretagogue and as such is useful for increasing the level of endogenous growth hormone.

本发明涉及2－氨基－N－{1－－(2，4－二氟－卞氧甲基)－2－氧代－2－3－氧代－3a－(R－吡啶－2－基甲基－2－(2，2，2－三氟－乙基)－2，3，3a，4，6，7－六氢化－吡唑子基(4，3－c)吡啶－5－基－乙基}－2－甲基－丙酰胺的－－酒石酸盐，它是一种生长激素促分泌素，并且可用于提高内源性生长激素水平。

With α-D-glucose as raw material, 3-O-benzoyl-1,2,5,6-O-diisopropylidene-α-D-allofuranose was synthesized by isopropylene protection , oxidation, reduction and benzoylation.

以α-D-葡萄糖为原料，经异丙叉基保护、氧化、还原、苯甲酰化反应合成3-苯甲酰基-1，2，5，6-氧-二异丙叉基-α-D-呋喃阿洛糖。

N,N '- ditertbutyl nitroxyl radical, 2, 2,6,6- tetramethyl-4 - hydroxyl piperdinehy droxylamine and its nitroxyl radical, as inhibitors of the BPO- initiated copolymerization of styrene (M 1 ) with acrylonitrile (M2 ), at 60℃,has been studied.

研究了二叔丁基羟胺，二叔丁基氮氧自由基，2，2，6，6－四甲基－4－羟基哌啶羟胺和2，2，6，6－四甲基－4－羟基哌啶－1－氧自由基对过氧化苯甲酰60℃引发的苯乙烯（M1）－丙烯腈（M2）共聚合的阻聚行为。

Bromo-5-formyl -3-methylpyrrole is an important intermediate of tolyporohin. On the base of introducing the present research and development of tolypo- rohin and pyrroles ramification at home and abroad, an emphasis was made on synthesis of 2-Bromo-5-formyl -3-methylpyrrole and the technical conditions of all steps, which was described as follows. Diethyl 3,5-dimethylpyrrole-2,4-dicarboxylate was made by nitrification, reduction and cycle of ethyl acetoacetate.

由于2-溴-5-甲酰基-3-甲基吡咯是合成托尼卟吩的重要中间体，本文在阐述了当前托尼卟吩及吡咯衍生物的国内外研究和开发的基础上，重点研究了2-溴-5-甲酰基-3-甲基吡咯的合成，并对各步反应进行了工艺研究，具体合成步骤如下：本文通过对乙酰乙酸乙酯的亚硝化、还原、成环，反应生成吡咯单环衍生物2，4-二乙氧羰基-3，5-二甲基吡咯。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。