1) dipolar reaction
偶极反应
1.
Fluoroindolizines and 2 fluoro benzo\indolizines 4 were synthesized in yields of 50%~70% via a 1,3 dipolar reaction of fluorinated vinyl tosylate 2 with N ylides of pyridinium or isoquinolinium for 24 h in the presence of K 2CO 3 and Et 3N in DMF.
2-二氟乙烯基对甲苯磺酸酯(2)与吡啶和异喹啉的叶立德(3)在DMF溶剂中,以K2CO3与Et3N作件下通过1,3偶极反应24h,以50%~70%的产率合成得到2位单氟环加成产物,2氟中氮茚及2氟苯并中氮茚衍生物4。
2) 1,3-dipolar reaction
1,3-偶极反应
1.
11β-Hydroxy-16β-methyl-16α,17α-methylene-pregna-1,4-dien-3,20-dione, an important chemical intermediate and excellent medicinal candidate, was prepared from prednisolone through 7 steps of methyl- sulfonylation, methylation, dehydration and double 1,3-dipolar reaction followed by double thermal decom- position with the total yield of 23.
由泼尼松龙(Prednisolone)为原料,经甲磺酰化、甲基化、脱水、两次1,3-偶极反应以及其后的两次热分解共7步反应,以23。
3) dipolar-cycloaddition reaction
偶极环加成反应
1.
The triazole compounds(7b and 8b) were obtained by dipolar-cycloaddition reaction from 3b and some carbonyl nucleophilic reagents containing active methylene.
合成了手性叠氮2(5H)-呋喃酮化合物(3a～3d);3b与含活泼亚甲基化合物发生偶极环加成反应,合成了带手性丁烯内酯的1,2,3-三唑化合物(8b和8b)。
4) dipole photonuclear reaction
偶极光核反应
5) 1,3-dipolar cycloaddition reaction
1,3-偶极环加成反应
1.
The influences of the frontier molecular orbitals and optimized geometry of the precursor on the reaction rates and endo/exo selectivity are discussed,and a reasonable explanation about the steroselectivity of 1,3-dipolar cycloaddition reaction in the presence of copper-(Ⅱ)-or.
用理论计算方法研究了Cu(Ⅱ)和Zn(Ⅱ)-手性二恶唑啉络合物与N-苄基-α-乙氧酰基硝酮形成的反应前驱体与乙基乙烯基醚的1,3-偶极环加成反应过程。
2.
The effect of the complexes of copper(II) or zinc(II) with 2,2-bis[2,2′-4(S)-benzyl-4,5-dihydrooxazole]propane catalysis on the 1,3-dipolar cycloaddition reactions of diphynyl nitrone with electron-rich ethyl vinyl ether under various reaction conditions is determined.
以手性双噁唑啉2,2-(2,2′-4(S)苄-基-4,5-二氢噁唑啉基)丙烷为配体,研究了它与铜或锌的络合物对二苯基硝酮与富电子烯烃乙烯基乙醚的1,3-偶极环加成反应的催化效果,并考察了不同反应条件对催化效果和产物立体选择性的影响。
3.
2%,1-Benzyl-5-phenyl-1,2,3-triazole was prepared through 1,3-dipolar cycloaddition reaction with benzylazide and phenylacetylene,and the yield was 26%.
苯乙炔和叠氮苄,通过1,3-偶极环加成反应制得1-苄基-5-苯基-1,2,3-三氮唑,收率26%。
6) 3 dipolar cycloaddition
3偶极环加成反应
补充资料：“质子-电子偶极-偶极”质子弛豫增强
“质子-电子偶极-偶极”质子弛豫增强
物理学术语。原子核外层中不成对的电子质量小，但磁动性很强，可使局部磁场波动增强，促使氢质子弛豫加快，从而使T1和T2缩短，这种效应即为PEDDPRE。过渡元素和镧系元素大部分在d和f轨道有多个不成对电子，所以其离子往往具有PEDDPRE，可用来作顺磁性对比剂，如钆(Gd)。Gd在外层有7个不成对电子，具有很强的顺磁性。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条