反应 d'oxepannethone-2 avec des 烷基锂 puis avec l'iodomethane; 获得 d'烷基-2 甲硫基-2 oxepannes(le groupemethylthio est ensuite elimine par Ph 3 SnH-AIBN)。应用辅助硫代内酯 suvantes: oxocannethone-2, oxonannethone-2, oxacycloheptadecannethion-2 et perhydro pyranno [3,2-b] oxocinne- et -oxoninnethone
Synthesis of medium-sized ring ethers from thionolactones. Applications to polyether synthesis
作者:K. C. Nicolaou、D. G. McGarry、P. K. Somers、B. H. Kim、W. W. Ogilvie、G. Yiannikouros、C. V. C. Prasad、C. A. Veale、R. R. Hark
DOI:10.1021/ja00173a013
日期:1990.8
Reductive desulfurization using triphenyltin hydride under radical conditions afforded the corresponding cyclicethers rapidly and efficiently and, in most cases, with complete stereocontrol. This methodology has been proven through the construction of model systems of rings B and D of brevetoxin A (1) and a synthesis of (±)-lauthisan
已经制备了多种中等大小的硫代内酯,并与亲核试剂缩合,在用甲基碘淬灭后得到烷基化硫代缩醛。在自由基条件下使用三苯基氢化锡进行还原脱硫可以快速有效地提供相应的环醚,并且在大多数情况下具有完全立体控制。该方法已通过构建短杆菌毒素 A (1) 的 B 环和 D 环模型系统以及 (±)-lauthisan 的合成得到证明
Indium Triiodide Catalyzed Direct Hydroallylation of Esters
作者:Yoshihiro Nishimoto、Yoshihiro Inamoto、Takahiro Saito、Makoto Yasuda、Akio Baba
DOI:10.1002/ejoc.201000475
日期:——
InI 3 -catalyzed hydroallylation of esters by using hydro-and allysilanes under mild conditions has been accomplished. Many significant groups such as alkenyl, alkynyl, cyano, and nitro ones survive under these conditions. This reaction system provided routes to both homoallylic alcohols and ethers, in which either elimination of the alkoxy moiety or of the carbonyl oxygen atom could be freely selected
通过在温和条件下使用氢化硅烷和烯丙基硅烷完成了 InI 3 催化的酯的氢化烯丙基化。许多重要的基团,如链烯基、炔基、氰基和硝基基团在这些条件下仍然存在。该反应体系为高烯丙醇和醚提供了途径,其中烷氧基部分或羰基氧原子的消除可以通过改变烷氧基部分和氢硅烷上的取代基自由选择。此外,内酯的氢烯丙基化发生在不开环的情况下,以高产率生产所需的环醚。
A new method for the preparation of the 6,6 and 6,7 ring systems of bicyclic ethers
Preparation of 2,7-dioxabicyclo[4.4.0]decane and 2,8-dioxabicyclo[5.4.0]undecane derivatives in five steps from dihydropyran are reported. Transformation of 3-bromo-2-allyloxepane into 2,7-dioxabicyclo-[5.4.0]-undecane is also described.
A novel one-step method for the reductive allylation of esters and the first total synthesis of (±)-erythrococcamide B
作者:Roman Lagoutte、James A. Wilkinson
DOI:10.1016/j.tetlet.2010.10.159
日期:2010.12
A novel and convenient one-step method for the reductive allylation of aliphatic and alicyclic esters using InBr3 as a catalyst is reported. This methodology has also been applied in the first total synthesis of (+/-)-erythrococcamide B. (C) 2010 Elsevier Ltd. All rights reserved.
Allylation of oxepane rings
作者:Sylvie Robin、Gérard Rousseau
DOI:10.1016/s0040-4039(98)00305-0
日期:1998.4
2-Allyloxepanes have been prepared by reaction of 2-(4-nitrobenzyloxy)oxepanes with allyltrimethylsilane in acetonitrile in die presence of BF3-Et2O or from 2-ethoxyoxepane in liquid sulphur dioxide without catalyst. (C) 1998 Elsevier Science Ltd. All rights reserved.