A Rh-catalyzed 1,2-sulfur migration/aza-Diels–Alder cascade initiated by aza-vinyl carbenoids from sulfur-tethered N-sulfonyl-1,2,3-triazoles
作者:Yu Jiang、Xiang-Ying Tang、Min Shi
DOI:10.1039/c4cc08829h
日期:——
A novel Rh(ii) catalyzed intramolecular 1,2-sulfur migration/intermolecular aza-Diels–Alder cascade of sulfur-tetheredN-sulfonyl-1,2,3-triazoles has been developed, efficiently affording sulfur-containing tetrahydropyridine derivatives.
Total Syntheses of (+)-Australine and (−)-7-Epialexine
作者:William H. Pearson、Jennifer V. Hines
DOI:10.1021/jo000689q
日期:2000.9.1
naturally occurring 3-(hydroxymethyl)pyrrolizidines. A third approach to these compounds was successful. The transformation of L-xylose into the azido epoxy tosylate 46 was accomplished using two Wittigreactions and an epoxidation, in addition to other standard functional group manipulations. Reductive double-cyclization of 46 afforded the pyrrolizidines 47a and 47b, which were debenzylated to afford
Structure–activity studies on the anti-proliferation activity of ajoene analogues in WHCO1 oesophageal cancer cells
作者:Catherine H. Kaschula、Roger Hunter、Nashia Stellenboom、Mino R. Caira、Susan Winks、Thozama Ogunleye、Philip Richards、Jonathan Cotton、Kani Zilbeyaz、Yabing Wang、Vuyolwethu Siyo、Ellen Ngarande、M. Iqbal Parker
DOI:10.1016/j.ejmech.2012.01.058
日期:2012.4
organosulfur compound ajoene derived from the rearrangement of allicin found in crushed garlic can inhibit the proliferation of tumour cells by inducing G2/M cell cycle arrest and apoptosis. We report on the application of a concise four-step synthesis (Hunter et al., 2008 [1]) that allows access to ajoene analogues with the end allyl groups substituted. A library of twelve such derivatives tested for
Epoxide ring opening of α,β-epoxysilanes with prop-2-ynyl sulfide dianion—synthesis of (11R,12S,5Z,7E,9E,14Z )-dihydroxyeicosa-5,7,9,14-tetraenoic acid
作者:Yuichi Kobayashi、Kiyoshi Shimizu、Fumie Sato
DOI:10.1039/a608429j
日期:——
A new methodology for synthesis of lipoxygenase metabolites possessing
vic-diol substructures coupled with the conjugated alkene system
is developed and successfully applied to the synthesis of
(11R,12S,5Z,7E,9E,14Z
)-di-hydroxyeicosa-5,7,9,14-tetraenoic acid (DiHETE).
under mild aqueous basic conditions through [2,3]-sigmatropic rearrangement of propargyl/allyl sulfur-ylides derived from in situ-generated Rh-(E)-enalcarbene. Various synthetically challenging allene- and allyl-functionalized (E)-enals with a γ-C(sp3) quaternary center were obtained in good to high yields. InCl3-catalyzed cascadecyclization of allenyl-enal and aniline gave a valuable pyrrolo[1,2-a]quinoline
在此,我们报告了一种用于功能化烯醛的简单方法,该方法涉及水溶性N-甲氧基哒嗪鎓盐的烯醛转移反应。这种开瓶反应在温和的水性碱性条件下通过原位生成的 Rh-( E )-烯醛卡宾衍生的炔丙基/烯丙基硫叶立德的 [2,3]-σ 重排进行。以良好至高产率获得了具有 γ-C(sp 3 ) 季中心的各种合成具有挑战性的丙二烯和烯丙基官能化 ( E )-烯醛。InCl 3催化的烯丙基-烯醛和苯胺的级联环化产生了有价值的吡咯并[1,2- a ]喹啉基序。