Nucleophilic Difluoromethylenation of Ketones Using Diethyl (Difluoro(trimethylsilyl)methyl)phosphonate Mediated by 18-Crown-6 Ether/KOAc
作者:Yu-Hui Wang、Zhong-Yan Cao、Jian Zhou
DOI:10.1021/acs.joc.6b01457
日期:2016.9.2
We report a general difluoromethylenation of various types of ketones using diethyl (difluoro(trimethylsilyl)methyl)phosphonate mediated by the combination of 18-crown-6 and KOAc. It provides facile access to structurally diverse β-hydroxy-α,α-difluorophosphonates as interesting targets for medicinal research.
[reaction: see text] Selective and effective fluorination of various types of organiccompounds performed in water as the reaction medium using 1-chloromethyl-4-fluoro-1,4-diazoniabicyclo[2.2.2]octane bis(tetrafluoroborate) (Selectfluor F-TEDA-BF4) is reported. 2-Naphthole and 2-methoxynaphthalene were thus transformed to 1,1-difluoro-2(1H)naphthalenone, estrone to 10beta-fluoro-1,4-estradien-3,17-dione
[反应:参见正文]使用1-氯甲基-4-氟-1,4-二氮杂双环[2.2.2]辛烷双(四氟硼酸酯)(Selectfluor F -TEDA-BF4)。因此,将2-萘酚和2-甲氧基萘转化为1,1-二氟-2(1H)萘酮,将雌酮转化为10β-氟-1,4-雌二醇-3,17-二酮,将苯基取代的烯烃转化为邻位氟代醇,和各种酮,1,3-二酮或β-酮酸酯,以形成相应的α-氟或α,α-二氟酮。
NITROGEN-CONTAINING FUSED RING COMPOUND, NITROGEN-CONTAINING FUSED RING POLYMER, ORGANIC THIN FILM, AND ORGANIC THIN FILM ELEMENT
申请人:Ie Yutaka
公开号:US20130041123A1
公开(公告)日:2013-02-14
Nitrogen-containing fused ring compound having at least one structural unit selected from the group consisting of a structural unit represented by the formula (1-1) and a structural unit represented by the formula (1-2).
Room temperature fluorination of 1,3-diketones and enol acetates with xenon difluoride
作者:Barbara Zajc、Marko Zupan
DOI:10.1039/c39800000759
日期:——
Fluorination of 1,3-diketones with xenon difluoride in the presence of the insoluble cross-linked polystyrene–4-vinylpyridine complex with borontrifluoride and insoluble cross-linked polystyrene–4-vinyl-pyridine resins resulted in the formation of mono- and di-fluoro products, while reactions with enol acetates in the presence of hydrogen fluoride gave α-fluoroketones.
Asymmetric Triple Relay Catalysis: Enantioselective Synthesis of Spirocyclic Indolines through a One-Pot Process Featuring an Asymmetric 6π Electrocyclization
A rare example of a one‐pot process that involves asymmetric triple relay catalysis is reported. The key step is an asymmetric [1,5] electrocyclic reaction of functionalized ketimines. The substrates for this process were obtained in situ in a two‐step process that involved the hydrogenation of nitroarenes with a Pd/C catalyst to yield aryl amines and their subsequent coupling with isatin derivatives