Utilization of Borane-Catalyzed Hydrosilylation as a Dearomatizing Tool: Six-Membered Cyclic Amidine Synthesis from Isoquinolines and Pyridines
作者:Vinh Do Cao、Dong Geun Jo、Seewon Joung、Huiae Kim、Changeun Kim、Seula Yun
DOI:10.1055/s-0040-1707323
日期:2021.2
N-heteroarenes. The reaction mechanism and reactivity of each class of N-heteroarenes has been discussed. The resulting six-membered (Z)-sulfonyl amidine products are rarely reported and are mostly unprecedented. The scalability of this method and versatility of the cyclic amidine products are also presented. Publication History Received: 18 August 2020 Accepted after revision: 09 September 2020 Publication Date:
describe the synthesis of cyclic N-acyl amidines from readily available N-heteroarenes. The synthetic methodology utilized the versatile N-silyl enamine intermediates from the hydrosilylation of N-heteroarenes for the [3 + 2] cycloaddition reaction step. We evaluated various acyl azides and selected an electronically activated acyl azide, thereby achieving a reasonable yield of cyclic N-acyl amidines. We
(3 + 2) Cycloaddition Reaction of the Endocyclic <i>N</i>-Silyl Enamine and <i>N</i>,<i>N′</i>-Cyclic Azomethine Imine
作者:Vinh Do Cao、Huiae Kim、Jaesung Kwak、Seewon Joung
DOI:10.1021/acs.orglett.2c00366
日期:2022.3.18
We describe the (3 + 2) cycloaddition reaction of endocyclic N-silyl enamines and N,N′-cyclic azomethine imines. This process utilized the versatile endocyclic N-silyl enamine intermediates from the dearomative hydrosilylation of N-heteroarenes. The resulting tetracyclic pyrazolidinone structure was synthesized by a straightforward and atom-economical process. We also discussed the plausible origins