A torquoselective extrusion of isoxazoline N-oxides. Application to the synthesis of aryl vinyl and divinyl ketones for Nazarov cyclization
摘要:
A mild, convenient reaction sequence for the synthesis of Nazarov cyclization substrates is described, The [3+2] dipolar cycloaddition of a nitrone and an electron-deficient alkyne gives all isolable isoxazoline intermediate, which upon oxidation undergoes stereoselectivc extrusion of nitrosomethane to give aryl vinyl or divinyl ketones. (C) 2008 Elsevier Ltd. All right, reserved.
A cobalt‐catalyzed regioselective [4+2] annulation/lactonization reaction of benzamides with 4‐hydroxy‐2‐alkynoates is reported. This reaction utilizes air as an oxidant rather than metal salts. The method is operationally simple, mild, and sustainable. This protocol exhibits a broad substrate scope and compatible with a variety of functional groups furnishing the corresponding 1,4‐dihydrofuro[3,4‐c]isoquinoline‐3
据报道,苯甲酰胺与4-羟基-2-链烷酸酯发生钴催化的区域选择性[4 + 2]环化/内酯化反应。该反应利用空气而不是金属盐作为氧化剂。该方法操作简单,温和且可持续。该方案具有广泛的底物范围,并与提供相应的1,4-二氢呋喃[3,4- c ]异喹啉-3,5-二酮衍生物的各种官能团兼容,具有良好的产率和较高的区域选择性。
Gold-Catalyzed One-Step Practical Synthesis of Oxetan-3-ones from Readily Available Propargylic Alcohols
作者:Longwu Ye、Weimin He、Liming Zhang
DOI:10.1021/ja1033952
日期:2010.6.30
A general solution for the synthesis of various oxetan-3-ones is developed. This reaction uses readily available propargylic alcohols as substrates and proceeds without the exclusion of moisture or air ("open flask"). Notably, oxetan-3-one, a highly valuable substrate for drug discovery, can be prepared in one step from propargyl alcohol in a fairly good yield. The facile formation of the strained
Regioselective Synthesis of 2-Alkenylindoles and 2-Alkenylindole-3-carboxylates through the Cascade Reactions of <i>N</i>-Nitrosoanilines with Propargyl Alcohols
作者:Xia Song、Cai Gao、Bin Li、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.joc.8b01098
日期:2018.8.3
In this paper, a novel and efficient synthesis of 2-alkenylindoles and 2-alkenylindole-3-carboxylates via the cascade reactions of N-nitrosoanilines with propargyl alcohols is presented. Mechanistically, the formation of the title compounds is triggered by a Rh(III)-catalyzed C(sp2)–H alkenylation of N-nitrosoaniline with propargyl alcohol followed by the simultaneous intramolecular amination/cyclization
Expeditious synthesis of pyrano[2,3,4-de]quinolines via Rh(<scp>iii</scp>)-catalyzed cascade C–H activation/annulation/lactonization of quinolin-4-ol with alkynes
作者:Gang Liao、Hong Song、Xue-Song Yin、Bing-Feng Shi
DOI:10.1039/c7cc04113f
日期:——
One-step synthesis of tetracyclic pyrano[2,3,4-de]quinolones via Rh(iii)-catalyzed cascade C–H activation/annulation/lactonization is described.