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.
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.
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.