Novel Microwave-Assisted One-Pot Synthesis of Isoxazoles by a Three-Component Coupling-Cycloaddition Sequence
作者:Thomas Müller、Benjamin Willy、Frank Rominger
DOI:10.1055/s-2007-1000856
日期:2008.1
The consecutive Sonogashira coupling of acid chlorides with terminal alkynes, followed by 1,3-dipolar cycloaddition under dielectric heating of in situ generated nitrile oxides from hydroximinoyl chlorides furnishes isoxazoles in moderate to good yields in the sense of a one-pot three-component reaction.
Cascade C═O/C═C/C–N Bond Formation: Metal-Free Reactions of 1,4-Diynes and 1-En-4-yn-3-ones with Isoquinoline and Quinoline <i>N</i>-Oxides
作者:Bing Zhang、Long Huang、Shiwei Yin、Xuetong Li、Tao Xu、Biyang Zhuang、Tao Wang、Zunting Zhang、A. Stephen K. Hashmi
DOI:10.1021/acs.orglett.7b01996
日期:2017.8.18
The metal-free reactions of 1,4-diynes and 1-en-4-yn-3-ones with isoquinoline and quinoline N-oxides are developed, resulting in the formation of 3,4-dihydro-2H-pyrido[2,1-a]isoquinolines and 2,3-dihydro-1H-pyrido[1,2-a]quinolines via cascade C═O/C═C/C–N bondformation. It is the first report in which in the alkyne oxidation by N-oxides both the oxygen atom of N-oxides and the nitrogen atom are involved
发展了1,4-二炔和1-en-4-yn-3- one与异喹啉和喹啉N-氧化物的无金属反应,导致形成3,4-二氢-2H-吡啶[2, 1- a ]异喹啉和2,3-二氢-1H-吡啶并[1,2- a ]喹啉通过级联C═O/C═C/ C-N键形成。它是其中在由炔烃氧化的第一份报告Ñ -oxides两者的氧原子Ñ -oxides及氮原子参与了第二个C -杂原子键的形成。反应显示出较宽的底物范围和官能团耐受性。此外,发现该产物在DMSO中显示绿蓝色荧光,荧光量子产率高达0.59。
Mechanistic Aspects of Alkyne Migration in Alkylidene Carbenoid Rearrangements
作者:Paul Bichler、Wesley A. Chalifoux、Sara Eisler、Annabelle L. K. Shi Shun、Erin T. Chernick、Rik R. Tykwinski
DOI:10.1021/ol8023665
日期:2009.2.5
The mechanism of the Fritsch−Buttenberg−Wiechell rearrangement of 13C labeled precursors has been examined to determine the propensity of the alkynyl (R−C≡C−) group to migrate in an alkylidene carbenoid species. Reaction of dibromoolefins with n-BuLi and ketones with Me3SiC(Li)N2 both demonstrate that the alkynyl moiety readily undergoes 1,2-migration from carbenoid intermediates.
已经对13 C标记前体的Fritsch-Buttenberg-Wiechell重排机制进行了研究,以确定炔基(RC- C - C)基团在亚烷基类胡萝卜素物质中迁移的倾向。二溴烯烃与n- BuLi的反应与酮与Me 3 SiC(Li)N 2的反应均表明炔基部分易于从类胡萝卜素中间体进行1,2-迁移。