The use of organic catalysis AcrH2 enables the direct β‐trifluoromethylation of carbonylcompounds by atom transfer radical addition reactions with broad substrate scopes under mild conditions. This operationally simple and robust protocol successfully converts a variety of β‐chloro carbonylcompounds into the corresponding α‐chloro‐β‐fluoroalkylcarbonyl products. A significant advantage of this method
Highly efficient arylations of β‐chloro ketones and their ester and amide derivatives were achieved by means of domino dehydrochlorination/Rh(I)‐catalyzed conjugate addition. In situ generated vinyl ketones and their analogues were identified as the reaction intermediates. The present synthetic protocol provides a concise route to (chiral) β‐aryl ketones, esters, and amides.
Copper-Catalyzed Tandem Asymmetric Borylation of β-Chloroalkyl Aryl Ketones and Related Compounds
作者:Quanbin Jiang、Tenglong Guo、Zhengkun Yu
DOI:10.1002/cctc.201402823
日期:2015.2
The Cu‐catalyzed, one‐pot tandem (asymmetric) borylation of β‐chloroalkyl aryl ketones via the in situ generated acyclic enones with bis(pinacolato)diboron was achieved efficiently to reach up to 97 % yield and 99 % enantioselectivity for the formal sp3 CCl borylation products. The present methodology provides an efficient alternative route to (chiral) alkylboron compounds.
A compound of formula (I), wherein X is O, CH.sub.2, S, SO or SO.sub.2 ; R is F or Cl; R.sub.1 is H, C.sub.1 -C.sub.6 alkyl or C.sub.2 -C.sub.6 alkenyl; R.sub.2 is H, C.sub.1 -C.sub.6 alkyl or C.sub.2 -C.sub.6 alkenyl; R.sub.3 is H, C.sub.1 -C.sub.6, alkyl, a pharmaceutically acceptable salt thereof, an enantiomer thereof, and a pharmaceutically acceptable salt of said enantiomer for use in therapy. A pharmaceutical preparation containing as active ingredient any one of said compounds. A process for the preparation of a compound of formula (I).
A new method has been developed for the cross-coupling of aryl halides with beta-chloroalkyl aryl ketones and their ester and amide analogs through a domino dehydrochlorination/Pd(OAc)(2)-catalyzed Heck reaction sequence. The enone intermediates generated in situ reduced the occurrence of side reactions and therefore enhanced the efficiency of the reaction. This reaction exhibited good tolerance to various functional groups on both substrates and provides rapid access to a wide range of chalcone derivatives. (C) 2015, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.