The Application of the Schmidt Reaction and Beckmann Rearrangement to the Synthesis of Bicyclic Lactams: Some Mechanistic Considerations
作者:Ian T. Crosby、James K. Shin、Ben Capuano
DOI:10.1071/ch09402
日期:——
The syntheses of some methoxy-substituted bicyclic lactams, of the types 3 and 4, are reported employing two different conditions for the Schmidt reaction of appropriate ketones and employing two different conditions for the Beckmann rearrangement of the corresponding ketoximes. The alkyl to aryl migration ratios of the reactions were determined by high-performance liquid chromatography analysis of
Synthesis of 3-alkyl-8-substituted- and 4-hydroxy-8-substituted-2,3,4,5-tetrahydro-1<i>H</i>-2-benzazepines
作者:Gary L. Grunewald、Vilas H. Dahanukar
DOI:10.1002/jhet.5570310656
日期:1994.11
Based on the Schmidt reaction and an iodolactone ring expansion reaction, two different synthetic routes to substituted 2,3,4,5-tetrahydro-1H-2-benzazepines were developed. The Schmidt reaction on 2,3-dihydro-2H-1-naphthalenone (1) gave 3, the product resulting from the alkyl group migration, as the major product instead of the tetrazole 2. This prompted the investigation of the Schmidt reaction on
基于Schmidt反应和碘内酯扩环反应,开发了两种不同的合成途径来取代2,3,4,5-四氢-1 H -2-苯并ze庚因。2,3-二氢-2-施密特反应ħ -1-萘酮(1),得到3,从烷基转移得到的产物,作为主要产物,而不是四唑2.这促使在施密特反应的调查芳族酮8和12。由于烷基的迁移,产物9是在2-甲基-3,4-二氢-2 H -1-萘酮(8)上进行Schmidt反应的主要产物。β-酮二酯施密特反应后,图12给出了脱碳-氧化内酰胺的混合物。在这种情况下,由芳环的迁移引起的内酰胺13在另一内酰胺14上占优势。当内酰胺14进行硝化时,产生单一的区域异构体并转化为溴醇19。在甲醇氨的存在下,将碘内酯22单锅扩环成内酰胺23。碘代内酯22可以很容易地由2-烯丙基苯甲酸制备。
Effect of Ring Size or an Additional Heteroatom on the Potency and Selectivity of Bicyclic Benzylamine-Type Inhibitors of Phenylethanolamine <i>N</i>-Methyltransferase<sup>1a</sup>
作者:Gary L. Grunewald、Vilas H. Dahanukar、Piao Ching、Kevin R. Criscione
DOI:10.1021/jm9508292
日期:1996.1.1
In the search for potent and selective inhibitors of the enzyme phenylethanolamineN-methyltransferase (PNMT; EC 2.1.1.28), we examined the effect of ring size or an additional heteroatom in the conformationally-restricted benzylamine-type PNMT inhibitors. Based on semiempirical calculations (MNDO) and molecular modeling studies, PNMT-inhibitory activity of these compounds seemed to be dependent on
在寻找有效的和选择性的苯乙醇胺N-甲基转移酶抑制剂(PNMT; EC 2.1.1.28)时,我们研究了环大小或其他杂原子在构象受限的苄胺型PNMT抑制剂中的作用。根据半经验计算(MNDO)和分子模型研究,这些化合物的PNMT抑制活性似乎取决于(a)芳香环平面与内N原子孤对之间的扭转角(tau 2角), tau 2的最佳值约为-75度,(b)1,2,3,4-四氢异喹啉(5,THIQ)3位附近的空间体积。发现2,3,4,5-四氢-1H-2-苯并ze庚因(6)具有最高选择性(PNMT Ki = 3.34 microM,alpha 2 Ki = 11 microM,选择性= 3。2)与THIQ的其他同源物相比(PNMT Ki = 9.67 microM,α2 Ki = 0.35 microM,选择性= 0.036)。6的较高PNMT抑制活性归因于PNMT活性位点6的假定生物活性构象中的褶皱的亚甲基
Sudan, Sangeeta; Gupta, Rajive; Kachroo, P L, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1992, vol. 31, # 9, p. 610 - 612
作者:Sudan, Sangeeta、Gupta, Rajive、Kachroo, P L、Gupta, D K、Bhutani, K K
DOI:——
日期:——
Synthesis of Tricyclic Tetrazoles by Cascade Diazotization/Intramolecular Radical C–H Heteroarylation of Arenes
作者:Heun-Jong Ha、Bora Kim、Subin Jo、Sugyeong Kim、Junho Park、Chang-Woo Cho
DOI:10.1021/acs.joc.2c02187
日期:2023.3.3
A cascade diazotization/intramolecular radical C–H heteroarylation of 1-benzyloxy-5-aminotetrazoles and 1-phenethyl-5-aminotetrazoles as substrates using sodiumnitrite and aceticacid without any heating, catalysis, irradiation, or electrolysis is reported. This one-pot reaction afforded the desired tricyclic tetrazole products in good yields (up to 94%) without isolation of the diazonium salt intermediate