Iron-Catalyzed Ring Expansion of Cyclobutanols for the Synthesis of 1-Pyrrolines by Using MsONH<sub>3</sub>OTf
作者:Daijiao Zhuang、Tharcisse Gatera、Zhenyu An、Rulong Yan
DOI:10.1021/acs.orglett.1c04304
日期:2022.1.21
The synthesis of 1-pyrrolinesfrom cyclobutanol derivatives and an aminating reagent (MsONH3OTf) has been developed. This one-pot procedure achieves C–N bond/C═N bond formation via ring expansion. A series of 1-pyrroline derivatives are synthesized in moderate to good yields under mild conditions.
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
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
Herein, we first present a nickel-catalyzed arylation and alkenylation of tert-cyclobutanols with aryl/alkenyl triflates via a C–Cbondcleavage. An array of γ-substituted ketones was obtained in moderate-to-good yields, thus featuring earth-abundant nickel catalysis, broad substrate scope, and simple reaction conditions. Preliminary mechanistic experiments indicated that β-carbon elimination pathways
Highly Regioselective C–H Alkylation of Alkenes Through an Aryl to Vinyl 1,4-Palladium Migration/C–C Cleavage Cascade
作者:Quannan Wang、Rongjun Chen、Jiang Lou、Dong H. Zhang、Yong-Gui Zhou、Zhengkun Yu
DOI:10.1021/acscatal.9b04161
日期:2019.12.6
4-palladium migration/ring-opening C–C cleavage cascade, giving trisubstituted alkenes in high yields. The protocol features good regioselectivity, high yields, broad substrate scopes, and good functional group tolerance. The mechanistic studies implicate that the cross-coupling reaction occurs via oxidative addition, 1,4-palladium migration, ring-opening C–C cleavage, and reductive elimination. DFT calculations