Fe(0)-Mediated Synthesis of Tri- and Tetra-Substituted Olefins from Carbonyls: An Environmentally Friendly Alternative to Cr(II)
作者:J. R. Falck、Romain Bejot、Deb K. Barma、Anish Bandyopadhyay、Suju Joseph、Charles Mioskowski
DOI:10.1021/jo061445u
日期:2006.10.1
carbonyls by activated polyhalides. In many instances, Fe(0) was equivalent or superior to Cr(II). Notably, Fe(0), but not Cr(II), proved compatible with a wide range of functionality, inter alia, unprotected phenol, aryl nitro, carboxylic acid, and alkyl nitrile. A surprising reversal of stereoselectivity for aldehydes versus ketones was observed using both metals. The resultant α-halo-α,β-unsaturated or α
A 2-pyridone compound represented by the formula [1]:
wherein in the formula [1],
the ring represented by A represents a benzene ring or a pyridine ring,
X represents any of the structures represented by the formulas [3] shown below:
V represents a single bond or a lower alkylene group, and
W represents a single bond, an ether bond or a lower alkylene group (wherein the lower alkylene group may contain an ether bond)},
a tautomer or stereoisomer of the compound, a pharmaceutically acceptable salt thereof, or a solvate thereof is a compound that has an excellent GK activating effect and is useful as a pharmaceutical.
<i>gem</i>-Halofluorocyclopropanes via [2 + 1] Cycloadditions of In Situ Generated CFX Carbene with Alkenes
作者:Colby Barrett、Vinayak Krishnamurti、Xanath Ispizua-Rodriguez、Ziyue Zhu、Christopher J. Koch、G. K. Surya Prakash
DOI:10.1021/acs.orglett.2c02126
日期:2022.7.29
developed. The method employs ethyl dibromofluoroacetate (EDBFA) as an accessible and inexpensive source of the bromofluorocarbene (:CFBr) intermediate. The protocol provides the bromofluorocyclopropane products in excellent yields, including examples synthesized in multigram scales. The chlorinated ester, ethyl dichlorofluoroacetate (EDCFA), is also utilized to make the analogous gem-chlorofluorocyclopropanes
Synthesis of Small 3-Fluoro- and 3,3-Difluoropyrrolidines Using Azomethine Ylide Chemistry
作者:Indrawan McAlpine、Michelle Tran-Dubé、Fen Wang、Stephanie Scales、Jean Matthews、Michael R. Collins、Sajiv K. Nair、Mary Nguyen、Jianwei Bian、Luis Martinez Alsina、Jianmin Sun、Jiaying Zhong、Joseph S. Warmus、Brian T. O’Neill
DOI:10.1021/acs.joc.5b00853
日期:2015.7.17
Here, we report accessing small 3-fluoropyrrolidines and 3,3-difluoropyrrolidines through a 1,3-dipolar cycloaddition with a simple azomethine ylide and a variety of vinyl fluorides and vinyl difluorides. We demonstrate that vinyl fluorides within alpha,beta-unsaturated, styrenyl and even enol ether systems can participate in the cycloaddition reaction. The vinyl fluorides are relatively easy to synthesize through a variety of methods, making the 3-fluoropyrrolidines very accessible.
Aminophenylethanols and Related Compounds
作者:Seymour L. Shapiro、Harold Soloway、Louis Freedman