Synthetic Studies on Cyclocitrinol: Construction of the ABC Ring System Based on Epoxy–Nitrile Cyclization
作者:Keiji Tanino、Kazuto Sato
DOI:10.1055/a-1334-6100
日期:2021.4
The stereoselective synthesis of a model compound containing the ABC ring system of cyclocitrinol was accomplished. After connecting a C-ring allyltitanium segment with an A ring bicyclo[4.1.0]heptanone segment, the seven-membered B ring moiety was constructed by an intramolecular cyclization reaction of an epoxy nitrile. The enone moiety was introduced through an oxidative decyanation reaction, and
完成了含有环柠檬醇ABC环系的模型化合物的立体选择性合成。在将 C 环烯丙基钛链段与 A 环双环 [4.1.0] 庚酮链段连接后,通过环氧腈的分子内环化反应构建了七元 B 环部分。通过氧化脱氰反应引入烯酮部分,并通过双环[4.1.0]庚烷亚结构的开环反应形成具有高度应变烯烃部分的双环[4.4.1]十一烷骨架。
Medium-dependent lithiated side products in the reductive lithiation of allylic phenyl thioethers. Diethyl ether versus tetrahydrofuran
作者:Constantinos G. Screttas、Georgios A. Heropoulos、Maria Micha-Screttas、Barry R. Steele
DOI:10.1016/j.tetlet.2005.04.080
日期:2005.6
Diethyl ether is a convenient solvent for the reductive lithiation of allylic phenyl thioethers without the serious complications, which occur when the reaction is carried out in tetrahydrofuran.
Allylcerium(III) compounds, powerful new synthetic reagents. A new stereocontrolled approach to olefins and methylene-interrupted polyenes
作者:Bao Shan Guo、Wendel Doubleday、Theodore Cohen
DOI:10.1021/ja00249a038
日期:1987.7
Synthese en particulier d'octadiene-1,5ol-3 et undecatriene-1,5,8ol-3 a partir de la reaction de sulfures allyliques avec des enaldehydes ou enones en presence d'allyl-cerium
合成这些 en particulier d'octadiene-1,5ol-3 和 undecatriene-1,5,8ol-3 a partir de la reaction desulfes allyliques avec des enaldehydes ou enones en存在 d'allyl-cerium
A Novel Method for Furan Annelation by the Regioselective Acylation of Allylic Sulfides<i>via</i>α-Silyl Intermediates
作者:Kunio Hiroi、Hiroyasu Sato
DOI:10.1055/s-1987-28081
日期:——
Aluminum chloride-catalyzed acylations of allylic phenyl sulfides 3 with acid chlorides 5 were carried out via α-silyl intermediates 4 to give γ-acylated vinylic sulfides 6 with complete regioselectivity. Treatment of the γ-acylated compounds with concentrated sulfuric acid in refluxing benzene led to the formation of α-phenylthiofurans 7, which on reductive desulfurization with Raney nickel afforded various furan derivatives 8.
Silica gel catalysed generation of episulfonium ions: a mild method for the synthesis of heterocycles
作者:Lorenzo Caggiano、David J. Fox、Stuart Warren
DOI:10.1039/b207542n
日期:2002.10.18
β-Carbonyloxy sulfides fragment when heated with silica or alumina to produce reactive episulfonium ion intermediates. Intramolecular activation of the leaving group and concurrent protection of a nitrogen or oxygen nucleophile via a cyclic carbamate or carbonate leads to the formation of pyrrolidines or cyclic ethers.