Terminal Alkyne Addition to Diazodicarboxylates: Synthesis of Hydrazide Linked Alkynes (Ynehydrazides)
摘要:
A new route to form C-sp-N bonds has been developed via addition of in situ generated lithium acetylides to sterically hindered diazodicarboxylates. The reaction provides straightforward access to a previously unexplored ynehydrazide class of stable N-linked alkynes directly from commercially available precursors. Preliminary results show that alkynyl hydrazides are useful reagents for the selective installation of nitrogen functional groups and as precursors to pharmaceutically relevant heterocycles using metal catalyzed cycloadditions and condensations.
Short and Modular Synthesis of Substituted 2-Aminopyrroles
作者:Raquel Diana-Rivero、Beate Halsvik、Fernando García Tellado、David Tejedor
DOI:10.1021/acs.orglett.1c01345
日期:2021.5.21
We herein describe a simple and metal-free domino methodology to synthesize 2-aminopyrroles from alkynyl vinyl hydrazides. The domino reaction involves a novel propargylic 3,4-diaza-Cope rearrangement and a tandem isomerization/5-exo-dig N-cyclization reaction. By using this approach, a number of 2-aminopyrroles with diverse substituents have been prepared.
Terminal Alkyne Addition to Diazodicarboxylates: Synthesis of Hydrazide Linked Alkynes (Ynehydrazides)
作者:Ramsay E. Beveridge、Robert A. Batey
DOI:10.1021/ol2031608
日期:2012.1.20
A new route to form C-sp-N bonds has been developed via addition of in situ generated lithium acetylides to sterically hindered diazodicarboxylates. The reaction provides straightforward access to a previously unexplored ynehydrazide class of stable N-linked alkynes directly from commercially available precursors. Preliminary results show that alkynyl hydrazides are useful reagents for the selective installation of nitrogen functional groups and as precursors to pharmaceutically relevant heterocycles using metal catalyzed cycloadditions and condensations.
Radical Cyclization of Ynamides to Nitrogen Heterocycles
amounts of AIBN in toluene at 80 °C, a range of ynamides bearing a N-iodopropyl chain could be smoothly cyclized, in a highly regio- and stereoselective manner, to the corresponding 2-arylidenepyrrolidines in good to excellent yields. The exocyclic double bond was in addition shown to be an excellent anchor for further chemical diversification and the generality of this radical cyclization could be
报道了将适当官能化的ynamides有效地自由基环化为含氮杂环。在催化量 AIBN 的存在下,在甲苯中于 80 °C 与三丁基氢化锡反应,一系列带有N-碘丙基链的炔酰胺可以以高度区域选择性和立体选择性的方式顺利环化为相应的 2-亚芳基吡咯烷在良好的产量。此外,环外双键被证明是进一步化学多样化的极好锚,并且这种自由基环化的普遍性可以通过其扩展到其他氮杂环的合成来突出,包括哌啶、氮杂环己烷、吡唑烷和六氢哒嗪。