Sc(OTf)3-Catalyzed [3 + 3] Cycloaddition of Cyclopropane 1,1-Diesters with Phthalazinium Dicyanomethanides
摘要:
The Sc(OTf)(3)-catalyzed diastereoselective [3 + 3] cycloaddition of phthalazinium dicyanomethanides with cyclopropane 1,1-diesters proceeded smoothly under mild reaction conditions, affording a variety of 3,4-dihydro-1H-pyrido[2,1-a]phthalazine derivatives in up to 99% yields with excellent diastereoselectivities.
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
[4+3] Cycloaddition of Donor-Acceptor Cyclopropanes with Amphiphilic Benzodithioloimine as Surrogate for <i>ortho</i>
-Bisthioquinone
作者:Lennart K. B. Garve、Martin Pawliczek、Jan Wallbaum、Peter G. Jones、Daniel B. Werz
DOI:10.1002/chem.201504013
日期:2016.1.11
Donor–acceptorcyclopropanes were reacted with amphiphilic benzodithioloimine to give seven‐membered heterocycles with two sulfur atoms. Formally, this transformation can be regarded as a [4+3] cycloaddition reaction of the three‐membered ring and ortho‐bisthioquinone. The benzodithioloimine serves as a surrogate for this highly reactive diene. The structure of the products was confirmed by X‐ray crystallography
供体-受体环丙烷与两亲性苯并二硫代次氯亚胺反应生成具有两个硫原子的七元杂环。从形式上讲,这种转变可以看作是三元环和邻双硫代醌的[4 + 3]环加成反应。苯并二硫代次氯亚胺用作该高反应性二烯的替代物。产品结构通过X射线晶体学确认。13 C NMR研究中的宽信号表明,室温下存在几个在NMR时标上缓慢相互转化的构象体。
Synthesis of 2-Unsubstituted Pyrrolidines and Piperidines from Donor–Acceptor Cyclopropanes and Cyclobutanes: 1,3,5-Triazinanes as Surrogates for Formylimines
作者:Lennart K. B. Garve、Alexander Kreft、Peter G. Jones、Daniel B. Werz
DOI:10.1021/acs.joc.7b01631
日期:2017.9.1
A synthetic procedure to access 2-unsubstituted pyrrolidines and piperidines is presented. In the presence of MgI2 as Lewis acid, donor–acceptor cyclopropanes or corresponding cyclobutanes were treated with 1,3,5-triazinanes, leading to the five- or six-membered ring systems under mild conditions in yields up to 93%. This protocol tolerates a great variety of functional groups and thus provides an
[3 + 3]-Cycloaddition of Donor–Acceptor Cyclopropanes with Nitrile Imines Generated in Situ: Access to Tetrahydropyridazines
作者:Lennart K. B. Garve、Martin Petzold、Peter G. Jones、Daniel B. Werz
DOI:10.1021/acs.orglett.5b03598
日期:2016.2.5
Donor–acceptor cyclopropanes are reacted under the influence of a Lewis acid with hydrazonyl chlorides to afford tetrahydropyridazines. Formally, this transformation can be regarded as a [3 + 3]-cycloaddition of three-memberedrings and nitrile imines generated in situ. This efficient method provides fast access to a variety of structurally diverse pyridazine derivatives. The structure of a typical product was