A novel and efficient Pd-catalyzed intermolecular [3 + 2] carbocyclization of alkynols and electron-deficient alkynes for the synthesis of halo-cyclopentadienes (Cps) has been developed. The present protocol employs simple propargyl alcohols as the C3 group to participate in the cyclization reaction, providing a highly convenient and atom-economical entry to the halo-cyclopentadiene framework.
Construction of pyrazolo[5,1-a]isoindol-8(3aH)-one derivatives via phosphine-catalyzed cyclization of electron-deficient alkynes and N-amino substituted phthalimide
作者:Qing-Fa Zhou、Fei-Fei Ge、Qing-Qing Chen、Tao Lu
DOI:10.1039/c5ra17267e
日期:——
A novel method for the synthesis of diversely functionalized pyrazolo[5,1-a]isoindol-8(3aH)-ones is developed via phosphine-catalyzed tandem Michael addition/intramolecular Morita–Baylis–Hillman reaction of electron-deficientalkynes and N-amino substituted phthalimide. This cyclization is operationally simple under metal-free reaction conditions.
通过膦催化串联迈克尔加成反应/缺电子炔烃和氮的分子内Morita-Baylis-Hillman反应,开发了一种新颖的合成功能多样的吡唑并[5,1- a ] isoindol-8(3 aH)-ones的新方法-氨基取代的邻苯二甲酰亚胺。在无金属的反应条件下,这种环化操作简单。
Metal-free synthesis of N-vinyl sulfoximines via DABCO-participated Michael addition of terminal carbonyl alkynes with N-chlorosulfoximines
A newmethod has been developed to prepare N-vinyl sulfoximines via a DABCO-participated Michael addition of carbonyl alkynes with N-chlorosulfoximines in the absence of metal. Various N-chlorosulfoximines and carbonyl alkynes were used as substrates in this novel protocol successfully, and only the corresponding (E)-N-vinyl sulfoximines were afforded in moderate yields. The establishment of this new
开发了一种新方法,通过 DABCO 参与的羰基炔烃与N-氯亚砜亚胺在无金属存在下的迈克尔加成反应制备 N-乙烯基亚砜亚胺。各种N -氯亚砜亚胺和羰基炔烃被成功地用作该新方案中的底物,并且仅以中等产率提供了相应的 ( E )- N -乙烯基亚砜亚胺。这种与空气相容性好、效率高且避免过渡金属的新合成方法的建立,将为在绿色、简单的条件下获得功能性N-乙烯基亚砜亚胺提供一种替代途径。
Visible‐Light‐Irradiated Multicomponent Reactions of Aliphatic Amines, Propiolate Acid Esters, and CF<sub>3</sub>SO<sub>2</sub>Na for Accessing <i>β</i>‐CF<sub>3</sub> Enamines
A novel visible-light driven two-step one-pot multicomponent reactions of aliphaticamines and propiolate acid esters for preparation of β-CF3 enamines has been reported.