(3 + 2)-Cycloaddition of Donor–Acceptor Cyclopropanes with Selenocyanate: Synthesis of Dihydroselenophenes and Selenophenes
作者:Anu Jacob、Peter G. Jones、Daniel B. Werz
DOI:10.1021/acs.orglett.0c03329
日期:2020.11.6
We present a Lewis-acid-catalyzed (3 + 2)-cycloaddition of donor–acceptor cyclopropanes and selenocyanate (as its tetramethylammonium salt) for the synthesis of dihydroselenophenes. The transformation proceeded with moderate to excellent yields and showed a high functional group tolerance. Further oxidation using DDQ delivered selenophenes.
Ring-Opening 1,3-Dichlorination of Donor–Acceptor Cyclopropanes by Iodobenzene Dichloride
作者:Lennart K. B. Garve、Philip Barkawitz、Peter G. Jones、Daniel B. Werz
DOI:10.1021/ol5029139
日期:2014.11.7
Donor–acceptor cyclopropanes are reacted with iodobenzenedichloride to afford ring-opened products bearing chlorine atoms in the 1- and 3-positions, adjacent to the donor and acceptor groups. A variety of different donors (e.g., alkyl, aryl, N, and O) and acceptor moieties (e.g., ketones, diesters, and dinitriles) are used.
Copper-Catalyzed Oxidative Dehydrogenative Reaction of Quinoline-<i>N</i>-Oxides with Donor–Acceptor Cyclopropanes: Installation of a Tertiary Alkyl Motif at C2 Position
作者:Bikash Kumar Sarmah、Monuranjan Konwar、Animesh Das
DOI:10.1021/acs.orglett.1c03115
日期:2021.11.5
A copper-catalyzed oxidativedehydrogenative reaction of quinoline N-oxides with donor–acceptor cyclopropanes has been demonstrated to construct C2-alkylated quinolines containing a γ-keto diester motif. The use of molecularoxygen as an oxidant, excellent site-selectivity, and good functional group tolerance are the important features in this process. The preliminary mechanistic studies demonstrate
Ring-Opening 1-Amino-3-aminomethylation of Donor-Acceptor Cyclopropanes via 1,3-Diazepanes
作者:Lennart K. B. Garve、Peter G. Jones、Daniel B. Werz
DOI:10.1002/anie.201704619
日期:2017.7.24
The first ring‐openingreaction of donor–acceptorcyclopropanes to give diamines is reported. For this reaction, a 1,3‐bisfunctionalization was developed using cyclopropanes, triazinanes, and Sc(OTf)3 as the catalyst, followed by treatment with acid. The reaction proceeds under very mild conditions and tolerates many functional groups. Moreover, a library of various 1,3‐diazepanes, which arise as intermediates
Lewis Acid Catalyzed Nucleophilic Ring Opening and 1,3-Bisfunctionalization of Donor–Acceptor Cyclopropanes with Hydroperoxides: Access to Highly Functionalized Peroxy/(α-Heteroatom Substituted)Peroxy Compounds
作者:Kuldeep Singh、Tishyasoumya Bera、Vandana Jaiswal、Subrata Biswas、Biplab Mondal、Dinabandhu Das、Jaideep Saha
DOI:10.1021/acs.joc.8b02561
日期:2019.1.18
catalyzed ring opening reaction of Donor–Acceptor (D–A) cyclopropanes with alkyl hydroperoxides is reported to furnish various peroxycarbonyls and 1,3-haloperoxygenated compounds in good to excellent yields. This method adds another instance to scarcely reported noncyclilizing 1,3-bisfunctionalization of D–A cyclopropanes with two different functional groups and relies on the dual role of peroxide as nucleophile