六氢吡啶并[3,4- c ] [1,5]苯并硫氮杂s与一氧化氮的简便合成及高度原子经济的1,3-偶极环加成反应:六氢[1,2,4]恶二唑[5,4- d ]的立体选择性形成] pyrido [3,4- c ] [1,5]苯并噻氮平
摘要:
获得了一系列新的2-甲基-11-芳基-4-[(E)-芳基亚甲基] -1,2,3,4,11,11a-六氢吡啶并[3,4- c ] [1,5]苯并噻氮平在无溶剂微波辐射下,在催化量的乙酸存在下,邻氨基苯硫酚与(E)-1-甲基-3,5-双(亚芳基)-4-哌啶酮的反应。这些双亲性化合物与一氧化二氮进行高度原子经济的1,3-偶极环加成反应,得到一系列新颖的6-甲基-1-苯基-8-芳基-4-[[(E)-芳基亚甲基] -4,5,6, 7,7a,8-六氢[1,2,4]恶二唑并[ 5,4- d ]吡啶并[3,4- c ] [1,5]苯并硫氮杂s类化合物。
Organocatalytic Conjugate Addition of Malononitrile to Conformationally Restricted Dienones
作者:Zhi-Peng Hu、Chun-Liang Lou、Jin-Jia Wang、Chun-Xia Chen、Ming Yan
DOI:10.1021/jo200112r
日期:2011.5.20
Organocatalytic conjugateaddition of malononitrile to conformationally restricted dienones has been studied. A series of chiral primary and tertiary amine catalysts were screened. A piperidine-based thiourea-tertiary amine was found to be the efficient catalyst. Chiral pyran derivatives were obtained in excellent yields and enantioselectivities via a cascade conjugate addition–intramolecular cyclization pathway
MCM‐41‐SO3H, an ordered mesoporous silica material in which MCM‐41 with covalently anchored sulfonic acid groups was used as an acidic catalyst for the rapid and ‘green’ synthesis of pyrano[3,2‐c]pyridinederivatives under solvent‐free conditions. Reusability of the catalyst, high yields, short reaction times, simplicity and easy workup are advantages of this novel synthetic procedure compared to the
The 6,7,8,9-tetrahydropyrimido[4,5-b][1,6]naphthyridin-4(3H,5H,10H)-ones 4,5a–g and their oxidized forms 6,7a–g were obtained from the catalyst-free reaction of 6-amino-2-methylthiopyrimidin-4(3H)-one 3 and (E)-3,5-bis(benzylidene)-1-alkyl-4-piperidones 1,2a–g under Microwave irradiation and their subsequent oxidation process with p-chloranil. Eighteen of the new compounds were evaluated in the US
的6,7,8,9-四氢嘧啶并[4,5- b ] [1,6]萘啶-4(3 H ^,5 ħ,10 ħ) -酮4,图5a -克和它们的氧化形式6,图7a -克从6-氨基-2-甲硫基-4(3无催化剂反应获得ħ) -酮3和(ë)-3,5-双(亚苄基)-1-烷基-4-哌啶酮1,图2a – g在微波辐射下及其随后的氧化过程中,p-氯苯胺。在美国国家癌症研究所(NCI)中评估了18种新化合物,其中化合物4g对57种癌细胞具有显着活性,体外试验中最重要的GI 50值范围为1.48至9.92μM。
Sacrificial azomethine ylide cycloaddition controlled chemoselective nitrile oxide cycloaddition to 1-methyl-3,5-bis[(E)-arylmethylidene]tetrahydro-4(1H)-pyridinones: formation of mono-spiro-isoxazolines
作者:Raju Ranjith Kumar、Subbu Perumal
DOI:10.1016/j.tet.2007.09.033
日期:2007.12
The 1,3-dipolar cycloaddition of an azomethine ylide to 1-methyl-3,5-bis[(E)-arylmethylidene]tetrahydro-4(1H)-pyridinones afforded novel spiro-pyrrolidines in good yields. Further cycloaddition of these spiro-pyrrolidines with nitrile oxide afforded mono-spiro-isoxazolines in moderate yields (45–56%), presumably via a di-spiro intermediate, which undergoes a spontaneous cycloreversion of the spiro-pyrrolidine
Rapid Access for the Synthesis of 1‐N‐Methyl‐spiro[2.3′]oxindole‐spiro[3.7″] (3″‐Aryl)‐5″‐methyl‐3″,3a″,4″,5″,6″,7″‐hexahydro‐2H‐pyrazolo[4,3‐<i>c</i>]pyridine‐4‐aryl‐pyrrolidines Through Sequential 1,3‐Dipolar Cycloaddition and Annulation
作者:Gowri Sridhar、R. Raghunathan
DOI:10.1080/00397910500328795
日期:2006.2
various p‐substituted 3,5 bis(aryl methylidene)N‐methyl‐4‐piperidinones in refluxing methanol, proceeded regioselectively to give novel dispiroheterocycles. The product on subsequent annulation with hydrazine hydrate afforded 1‐N‐methyl‐spiro[2.3′]oxindole‐spiro[3.7″](3″‐aryl)‐5″‐methyl‐3″,3a″,4″,5″,6″,7″‐hexahydro‐2H‐pyrazolo[4,3‐c]pyridine‐4‐aryl‐pyrrolidines in good yield.