Silver-Catalyzed Vinylcarbene Insertion into C–C Bonds of 1,3-Diketones with Vinyl-<i>N</i>-triftosylhydrazones
作者:Yong Wu、Yongquan Ning、Xinyue Han、Peiqiu Liao、Ying Xia、Paramasivam Sivaguru、Xihe Bi
DOI:10.1021/acs.orglett.2c03176
日期:2022.11.11
We describe the silver-catalyzedformalinsertion of a vinylcarbene into unstrained C(CO)–C bonds of 1,3-diketones using vinyl-N-triftosylhydrazones as vinylcarbene precursors. This method allows the rapid synthesis of otherwise inaccessible 2-vinyl-substituted 1,4-diketones from relatively simple substrates. This mild catalytic protocol exhibits a good functional group tolerance and substrate scope
Rhodium‐Catalyzed One‐Carbon Ring Expansion of Aziridines with Vinyl‐N‐triftosylhydrazones for the Synthesis of 2‐Vinyl Azetidines
作者:Yongquan Ning、Hongzhu Chen、Yongyue Ning、Jin Zhang、Xihe Bi
DOI:10.1002/anie.202318072
日期:2024.3.18
A general skeletal ring expansion strategy for the direct conversion of aziridines into 2-vinyl azetidines via one-carbon insertion using vinyl-N-triftosylhydrazones is described. The method is scalable, tolerates diverse functional groups, and is amenable to the synthesis of medicinally relevant molecules.
Synthesis of 9-Fluorenylidenes and 9,10-Phenanthrenes through Palladium-Catalyzed Aryne Annulation by <i>o</i>-Halostyrenes and <i>o</i>-Halo Allylic Benzenes
作者:Shilpa A. Worlikar、Richard C. Larock
DOI:10.1021/jo9017827
日期:2009.12.4
A number of functionally substituted 9-fluorenylidenes and 9,10-phenanthrenes have been synthesized from substituted o-halostyrenes and o-halo allylic benzenes respectively in good yields by the palladium-catalyzed annulation of arynes. The methodology tolerates a variety of functional groups, including cyano, ester, aldehyde, and ketone groups, occurs Under relatively mild reaction conditions, and involves the generation of two new carbon-carbon bonds, thus providing these important carbocyclic ring systems in a single synthetic step.