Research Progress of Deprotection for Carboxylic Ester of Cephalosporins 头孢菌素羧基保护基的脱除方法研究进展
In the synthesis of organic intermediate compounds, cesium carbonate could be used as a mild and efficient reagent for deprotection [ 1] and as a base reagent [ 2]. 在有机中间体合成过程中作为一种温和的脱保护基基团[]以及一种有效的碱性试剂[]。
In situ synthesis of DNA microarray by means of deprotection with acid by electrolysis 电解致酸脱保护DNA在片合成研究
Studies on the Protection and Deprotection of Carbonyl Compound Catalysed by Solid Acids& structural analysis 固体酸催化下的羰基的保护和脱保护反应的研究及其结构的表征
The photoinduced electron transfer reaction between N-tosyl amides and2-phenyl-N, N '-dimethyl benzimidazoline ( PDMBI) provides an efficient approach for the deprotection of N-tosyl amides. 对甲苯磺酰基酰胺和2-苯基-N,N'-二甲基苯并咪唑啉(PDMBI)之间的光诱导电子转移反应,为酰胺的保护基&对甲苯磺酰基的脱除反应,提供了一条有效途径。
Studies on C-Glycosides& ⅴ. Protection and Deprotection of Phenolic Hydroxy Group in the Synthesis of Substituted Phenols by Grignard Reagents 碳苷研究&Ⅴ.用Grignard试剂合成取代苯酚中酚羟基的保护及脱保护
The compound, 3 ', 6'-bis ( tetramethylethylenedioxyboryl) fluorane, synthesized in this experiment is a kind of H2O2 fluorescence-strengthened reagent, which depends on deprotection mechanism and can examine the H2O2 concentration sensitively. 合成的3',6'-对戊酰硼荧光素是一种基于去保护机理的高灵敏H2O2荧光增强化合物,能灵敏地检测出样品中H2O2的含量。
Then coupling with A ring synthon, closing, deprotection, the aim product was synthesized finally. 然后再与A环合成子偶联、关环、脱保护完成目标产物的全合成。
Currently, the reaction progress monitoring focuses on amide acylation and deprotection reaction, while there is no method for the reaction progress of the intermediate-active esters. 目前,合成过程的中间监测方法主要集中在胺酰化及脱保护反应,而对于中间体一活化酯的反应进程没有监测方法。
Investigation on the Deprotection of Nucleic Acid with Acid by Electrolysis 核苷酸的电解致酸脱保护研究
The deprotection procedure of phenylacetyl group is the basic way to synthesis many kinds of cephem intermediates. 7-苯乙酰基的脱除工艺是合成众多头孢菌素的基本步骤。
In the first part, Studying on the protection and deprotection carbonyl compounds from aldehyde with Acetic anhydride catalysed by Ti02/ S042. There is high selectivity in protection of aldehyde. 第一部分:在固体酸TiO2/SO4~(2-)催化下,醛和乙酐作用生成1,1-二乙酸酯及1,1-二乙酸酯裂解进行羰基的保护及脱保护的研究。
Synthesis and Application of Novel H_2O_2 Fluorescent Probe Based on the Deprotection Mechanism 基于去保护机理的新型H2O2荧光探针的制备及应用
The hydroxy of the chiral source D-mannitol was protected via the formation of acetal and benzyl ether, and then chiral synthon 4 was prepared after the deprotection and oxygenolysis of the protected D-mannitol. 以D甘露醇作为手性源,分别通过形成缩醛和苄醚对羟基进行保护,然后脱缩醛、氧化裂解得到手性子4。
This method could avoid the complicated disposal steps of radical protection and deprotection in the chemical synthesis, simplify the procedur, improve the yield of the reaction. 该法可以省去化学合成法中复杂的保护和脱保护处理工序,简化反应流程,提高反应收率。
The Protection and Deprotection of Hydroxy in Carbohydrate Chemistry 糖化学中羟基的保护及脱保护
In the last step, we developed two methods of deprotection employing zinc dust and catalytic hydrogenolysis respectively to give the final product, and improved the work-up as well. 在最后一步脱保护基的研究中,我们分别采用了锌粉还原和钯碳氢化两种方法得到最终产品,并对其后处理的方法进行了改进。
Then, the corresponding isoflavone-7-O-glucosides were synthesized by condensation of the compounds with 1-bromo-2,3,4,6-tetra-O-acetyl-α-D-glucopyranose in the presence of phase-transfer catalyst followed by the deprotection of acyl groups, under literature conditions and improved conditions respectively. 相应异黄酮分别在文献条件和改进条件下,与1-溴-2,3,4,6-O-四乙酰基-α-D-吡喃葡萄糖在相转移催化作用下缩合、脱乙酰基保护制备了异黄酮糖苷。
By exploring the synthetic methodology of glycopeptides, we established the synthesis conditions of protection, coupling and deprotection in solution-phase combinatorial synthesis. 对糖肽类化合物合成进行了方法学研究,摸索出糖肽类化合物液相组合合成的保护条件、缩合条件和脱保护条件,确定了糖肽类化合物液相组合合成的通用性方法。
Deprotection of Glycerol Ether Using Iodine-Methanol 碘/甲醇体系对甘油醚脱保护
However, the route 4, which prepare the wanted compounds from erythromycin A, include 7 steps-oximation, protection, methylation, hydrolysis, oxidation, deprotection and addition reaction. 路线四是以红霉素为起始原料,经过肟化、保护、甲基化、水解、氧化、脱保护和取代共7步反应得到目标化合物。
We synthesized a series of glucose-donors by employing the orthogonal protection and functional group protection and deprotection strategies. 本文以D-(+)-葡萄糖为原料,采用正交保护以及官能团的保护与脱保护策略,合成一系列葡萄糖供体。
Compared with the current synthetic route, the new route is shortened, without protection and deprotection steps. 与文献报道的合成路线相比,新的合成路线无需保护与去保护步骤。
After the deprotection of benzyl, a lengthened side chain was linked with Nb, but the ring-closure still failed. 在脱掉苄基后,在Nb上连接了一个延长的侧链用于关环,但仍然没有成功。
But these conditions are not for the substrates which are sensitive to acid or alkali in the deprotection procedure. 羧酸酯类化合物的分解在酸性条件下和碱性条件下的研究较为普遍,但不适合用于去保护过程中有酸、碱敏感的底物。
There are still many problems of glucoside synthesis to be solved at the regioselectivity, stereo-selectivity and yield, etc. In general, such reactions need to deal with protection and deprotection of hydroxyl, leading to tedious steps, more by-products and lower yield. 糖苷合成在区域选择性,立体选择性,收率等方面仍有不少亟待解决的问题。一般来说,此类反应需要对羟基保护与脱保护,处理繁琐,反应收率降低,副产物增多。
After the deprotection of the block copolymer, we got the amphiphilic block copolymer. 我们对嵌段共聚物进行脱保护,得到了两亲性嵌段共聚物。
Thus, we expect that this methodology will find widespread use in the deprotection of this class of protecting group. 2. 因此,我们希望该脱除方法可以在脱除这一类的保护基团时得到广泛的应用。
The conventional chemical approach is characterized by low regioselectivity, the requirement of protection/ deprotection, and being environmentally unfriendly. 化学法糖基化存在区域选择性差、需要保护/脱保护步骤和环境不友好等诸多问题。