The stereochemistry of the intramolecular electrophilic attack of an aldehyde on a carbon-tin bond
作者:Ian Fleming、Michael Rowley
DOI:10.1016/s0040-4020(01)87383-x
日期:1986.1
The cyclopentane-forming reaction (20–43) of (4),5)-2, 2,4-trimethyl-5-trimethylstannylhexanal takes place with retention of configuration at the carbon atom undergoing electrophilicsubstitution, in contrast to similar cyclopropane-forming reactions (e.g. 47–48), which take place with inversion of configuration. The hydride transfer (24–45) of the 4,5 diastereoisomeric hexanal takes place from a conformation
(4 ),5 )-2,2,4-三甲基-5-三甲基锡烷基己醛的环戊烷形成反应(20–43)与亲电取代的碳原子形成相反,发生了亲电取代的碳原子上保留了构型反应(例如47–48),这是随着配置反转而发生的。4,5非对映异构己醛的氢化物转移(24-45)是从氢化物构象到苯乙烯基的。对于可能形成四元环的反应,会发生断裂(16–28和17–30)。带有苯乙烯基的碳上存在苯环会干扰旨在测试S E 2反应的立体化学的反应,从而使该反应转向形成四氢化萘(10-26和34-38)或苯环庚烯(34 –37)。
Facile Installation of 2-Reverse Prenyl Functionality into Indoles by a Tandem N-Alkylation-Aza-Cope Rearrangement Reaction and Its Application in Synthesis
作者:Xiaobei Chen、Huaqiang Fan、Shilei Zhang、Chenguang Yu、Wei Wang
DOI:10.1002/chem.201503355
日期:2016.1.11
approach to the preparation of synthetically and biologically important, but challenging, 2‐reverse quaternary‐centered prenylated indoles with high efficiency. Notably, unusual nonaromatic 3‐methylene‐2,3‐dihydro‐1H‐indole architectures, instead of aromatic indoles, are produced. Furthermore, the aza‐Cope rearrangement reaction proceeds highly regioselectively to give the quaternary‐centered reverse prenyl
Synthesis of 6<i>H</i>-Dibenzo[<i>b</i>,<i>d</i>]pyran-6-ones Using the Inverse Electron Demand Diels–Alder Reaction
作者:Ian R. Pottie、Penchal Reddy Nandaluru、Wendy L. Benoit、David O. Miller、Louise N. Dawe、Graham J. Bodwell
DOI:10.1021/jo201775e
日期:2011.11.4
These dienes reacted with the enamine derived from cyclopentanone and pyrrolidine to afford the corresponding cyclopenteno-fused 6H-dibenzo[b,d]pyran-6-ones, most likely via a domino inverseelectrondemandDiels–Alder (IEDDA)/elimination/transfer hydrogenation sequence. The parent diene (EWG = CO2Me, no substituents) was reacted with a range of electron-rich dienophiles (mostly enamines) to afford
合成了一组香豆素稠合的缺电子的1,3-二烯,它们在二烯单元末端的吸电子基团(EWG)的性质不同(当EWG = CO 2 Me时),其性质和取代基的位置。这些二烯与衍生自环戊酮和吡咯烷的烯胺反应,生成相应的环戊烯稠合的6 H-二苯并[ b,d ]吡喃-6-酮,很可能是通过多米诺逆电子需求Diels-Alder(IEDDA)/消除/转移加氢顺序。使母体二烯(EWG = CO 2 Me,无取代基)与一系列富电子的亲二烯体(主要是烯胺)反应,得到相应的6 H-二苯并[ b],d ] pyran-6-ones或它们的未脱氢前体,用合适的氧化剂处理后会被芳香化。烯胺可以在反应之前合成或就地产生。报道了30种二苯并吡喃酮的合成。
Formation of the 5-Azoniafulvene Ion and its Benzo-annellated Analogue from N-<i>Mannich</i>Bases of Pyrrole and Indole
作者:Ulrich Burger、Alain O. Bringhen、Philippe J. Wirthner、Jean-Claude Schärer
DOI:10.1002/hlca.19850680822
日期:1985.12.18
N-atom rather than at the pyrrole ring. Spontaneous cleavage of the resulting quaternary acylammonium salts affords the 5-azoniafulvene ion (3). This higly reactive iminium ion, and its benzo-annellated analogue (4) can be trapped by electron rich aromatic compounds such as N-methylpyrrole or N,N-dimethylaniline. More elaborate N-Mannich bases are accessible by addition of indoles to enamines.
Difluoro(trimethylsilyl)acetonitrile: Synthesis and Fluoroalkylation Reactions
作者:Mikhail D. Kosobokov、Alexander D. Dilman、Vitalij V. Levin、Marina I. Struchkova
DOI:10.1021/jo301094b
日期:2012.7.6
A new silicon reagent, difluoro(trimethylsilyl)acetonitrile, was prepared by insertion of difluorocarbene into silyl cyanide. The obtained silane served as a good cyanodifluoromethylating reagent toward aldehydes, N-tosylimines, N-alkylimines, and enamines under basic or acidic conditions.