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Ruthenium‐Catalyzed Geminal Hydroborative Cyclization of Enynes.

Authors :
Tan, Yun‐Xuan
Li, Shijia
Song, Lijuan
Zhang, Xinhao
Wu, Yun‐Dong
Sun, Jianwei
Source :
Angewandte Chemie International Edition. Aug2022, Vol. 61 Issue 31, p1-9. 9p.
Publication Year :
2022

Abstract

Disclosed here is the first geminal (gem‐) hydroborative cyclization of enynes. Different from known hydroborative cyclizations, this process adds hydrogen and boron to the same position, leading to a new reaction mode. With [Cp*RuCl]4 as catalyst, a range of gem‐hydroborated bicyclic products bearing a cyclopropane unit could be rapidly assembled from simple enyne substrates. Control experiments and density functional theory (DFT) calculations provided important insights into the reaction mechanism. Notably, two major competing pathways may operate with substrate‐dependence. 1,6‐Enynes favor initial oxidative cyclometalation to form a ruthenacyclopentene intermediate prior to engaging hydroborane, while other enynes (e.g. 1,7‐enynes) that lack strong propensity toward cyclization prefer initial alkyne gem‐(H,B)‐addition to form an α‐boryl ruthenium carbene followed by intramolecular olefin cyclopropanation. This process also represents the first ruthenium‐catalyzed enyne hydroborative cyclization. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
14337851
Volume :
61
Issue :
31
Database :
Academic Search Index
Journal :
Angewandte Chemie International Edition
Publication Type :
Academic Journal
Accession number :
158165490
Full Text :
https://doi.org/10.1002/anie.202204319