Synthesis of Silylated Cyclobutanone and Cyclobutene Derivatives Involving 1,4‐Addition of Zinc‐Based Silicon Nucleophiles
作者:Ming Cui、Martin Oestreich
DOI:10.1002/chem.202102993
日期:2021.11.22
intermediate metal enolate can be trapped as an enol phosphate and further reacted with Grignard reagents in Kumada cross-coupling reactions. By this, a range of silylated cyclobutanone and cyclobutenederivatives becomes accessible.
Synthesis of Highly Substituted Quinolines via a Tandem Ynamide Benzannulation/Iodocyclization Strategy
作者:Thomas P. Willumstad、Paul D. Boudreau、Rick L. Danheiser
DOI:10.1021/acs.joc.5b01648
日期:2015.12.4
A two-stage “tandem strategy” for the regiocontrolled synthesis of very highly substitutedquinolines is described. Benzannulation based on the reaction of cyclobutenones or diazo ketones with N-propargyl-substituted ynamides proceeds via a cascade of several pericyclic reactions to generate multiply substitutedaniline derivatives. In the second stage of the tandem strategy, triflate derivatives of
Synthesis of Polycyclic Benzofused Nitrogen Heterocycles via a Tandem Ynamide Benzannulation/Ring-Closing Metathesis Strategy. Application in a Formal Total Synthesis of (+)-FR900482
作者:Xiao Yin Mak、Aimee L. Crombie、Rick L. Danheiser
DOI:10.1021/jo2000308
日期:2011.3.18
variety of functionalized substituents at the position ortho to the nitrogen. In the second stage of the tandem strategy, ring-closingmetathesis generates the nitrogen heterocyclic ring. This two-step sequence provides efficient access to highly substituted dihydroquinolines, benzazepines, benzazocines, and related benzofused nitrogen heterocyclic systems. The application of this chemistry in a concise
Enantioselective Synthesis of 3‐Substituted Cyclobutenes by Catalytic Conjugate Addition/Trapping Strategies
作者:Changxu Zhong、Yingchao Huang、Haocheng Zhang、Qiang Zhou、Yu Liu、Ping Lu
DOI:10.1002/anie.201913825
日期:2020.2.10
A copper-catalyzed tandem process to generate chiral cyclobutene derivatives has been developed. It is based on an enantioselective conjugate addition or reduction of a cyclobutenone and sequential trapping with a chlorophosphate in a one-pot process. These phosphates are stable under mildly acidic conditions and serve as good electrophiles in Negishi coupling reactions.
[4+3]-Cycloaddition Reaction of Sulfilimines with Cyclobutenones: Access to Benzazepinones
作者:Xiaozhou Xie、Jiangtao Sun
DOI:10.1021/acs.orglett.1c03413
日期:2021.11.19
A catalyst-free [4+3]-cycloadditionreaction of N-aryl sulfilimines with cyclobutenones is described, which provides a straightforward protocol for synthesizing 1,5-dihydro-2H-benzo[b]azepin-2-ones under mild reaction conditions. This reaction features a broad substrate scope and good functional group tolerance and does not require catalysts or additives. Moreover, using N-pyridinyl sulfilimine as
描述了N-芳基硫亚胺与环丁烯酮的无催化剂 [4+3] -环加成反应,为在温和反应下合成 1,5-二氢-2 H-苯并 [ b ]azepin-2-ones提供了一个简单的方案状况。该反应具有广泛的底物范围和良好的官能团耐受性,并且不需要催化剂或添加剂。此外,以N-吡啶基硫亚胺为底物,还制备了一系列吡啶并氮杂酮类化合物。