Synthesis of 2-Fluoro- Acids, Esters, and Amides From Ã-Dicyanoepoxides
作者:A. Ould Amanetoullah、M. M. Chaabouni、A. Baklouti
DOI:10.1080/00397919608003723
日期:1996.3
Abstract The opening of A-dicyanoepoxides by pyridine polyhdrofluoride yields polymerisable 2-fluorocyanoformyls which may be kept intact when diluated in dichloromethane or ether. These intermediates react with nuclecophiles such as water, methanol or amines to give respectivly 2-fluoroacids, esters or amides.
Methods of halogenating a carbon containing compound having an sp3 C—H bond are provided. Methods of fluorinating a carbon containing compound comprising halogenation with Cl or Br followed by nucleophilic substitution with F are provided. Methods of direct oxidative C—H fluorination of a carbon containing compound having an sp3 C—H bond are provided. The halogenated products of the methods are provided.
VERFAHREN ZUR HERSTELLUNG FLUORIERTER CYCLISCHER ALIPHATISCHER VERBINDUNGEN
申请人:Westfälische Wilhelms-Universität Münster
公开号:EP3601203A1
公开(公告)日:2020-02-05
Simple procedure for preparation of α-fluoro esters by fluorination of ester enol silyl ethers with perchloryl fluoride
作者:Hidehito Fujisawa、Yoshio Takeuchi
DOI:10.1016/s0022-1139(02)00185-9
日期:2002.10
Fluorination of ester enol silyl ethers in THF at room temperature using diluted perchlorylfluoride (FClO3) in the presence of ca. 0.5 M eq. of t-BuNH2 as an additive produced the corresponding α-fluoro esters in over 80% yields.
Introduction of a fluorine atom into position 16 of the Ï-chain is a useful tool for modulation of biological activity in the prostanoid field. We devised a facile, four-step synthesis of 1-fluorocyclohexanecarboxylic acid, a precursor of phosphoranes and phosphonates required for building up the Ï-chain of the fluorinated prostacyclin 1. This method is generally applicable to the synthesis of α-fluoro-α-branched carboxylic acids from ketones.