centered around ring-opening carbon–carbon bond cleavage/fluorination of strained cycloalkanols, either using precious silver catalysis or superstoichiometric ceric ammonium nitrate (CAN). Careful study of these methods has allowed us to design and develop a general Earth-abundant-element-catalyzed method for remotely fluorinated ketone synthesis via C–C bond cleavage. Critically, the use of manganese
Rapid and scalable synthesis of fluoroketones <i>via</i> cerium-mediated C–C bond cleavage
作者:Yen-Chu Lu、Helen M. Jordan、Julian G. West
DOI:10.1039/d0cc08183c
日期:——
Ketones with remote fluorination are an important motif in the synthesis of bioactive molecules. Here we demonstrate that ceric ammonium nitrate (CAN) is able to produce this functionality under incredibly mild conditions and short reaction times (30 min) while eliminating the need for precious metals in previous methods. Importantly, this method allows the efficient synthesis of a wide variety of
Manganese-Catalyzed Electrochemical Deconstructive Chlorination of Cycloalkanols via Alkoxy Radicals
作者:Benjamin D. W. Allen、Mishra Deepak Hareram、Alex C. Seastram、Tom McBride、Thomas Wirth、Duncan L. Browne、Louis C. Morrill
DOI:10.1021/acs.orglett.9b03652
日期:2019.11.15
A manganese-catalyzedelectrochemicaldeconstructivechlorination of cycloalkanols has been developed. This electrochemical method provides access to alkoxyradicals from alcohols and exhibits a broad substrate scope, with various cyclopropanols and cyclobutanols converted into synthetically useful β- and γ-chlorinated ketones (40 examples). Furthermore, the combination of recirculating flow electrochemistry
TFA‐Catalyzed [3+2] Spiroannulation of Cyclobutanols: A Route to Spiro[cyclobuta[
<i>a</i>
]indene‐7,1′‐cyclobutane] Skeletons
作者:Zhenyu An、Yafeng Liu、Yanwei Sun、Rulong Yan
DOI:10.1002/asia.202001048
日期:2020.11.16
A straightforward method for the synthesis of spiro[cyclobuta[a]indene‐7,1′‐cyclobutane] derivatives from cyclobutanols has been developed viaone‐pot [3+2] spiroannulation. A series of new spiro[cyclobuta[a]indene‐7,1′‐cyclobutane] derivatives are facilely synthesized in good yields under mildreaction conditions.
一种通过单锅[3 + 2]螺环合成法开发了一种从环丁醇合成螺[cyclobuta [ a ] indene-7,1'-cyclobutane]衍生物的简单方法。在温和的反应条件下,以高收率容易地合成了一系列新的螺[cyclobuta [ a ] indene-7,1'-cyclobutane]衍生物。
Visible‐Light Photoredox‐Catalyzed Semipinacol‐Type Rearrangement: Trifluoromethylation/Ring Expansion by a Radical–Polar Mechanism
作者:Basudev Sahoo、Jun‐Long Li、Frank Glorius
DOI:10.1002/anie.201503210
日期:2015.9.21
semipinacol‐type rearrangement proceeding via 1,2 alkyl migration was developed. In this transformation, trifluoromethylation of the CC bond of α‐(1‐hydroxycycloalkyl)‐substituted styrene derivatives is followed by ringexpansion of the 1‐hydroxycycloalkyl group to deliver novel cycloalkanones with all‐carbon quaternary centers. The reaction proceeds via a radical–polar mechanism, with trifluoromethylation