Expeditious Construction of a Carbobicyclic Skeleton via sp3-C−H Functionalization: Hydride Shift from an Aliphatic Tertiary Position in an Internal Redox Process
摘要:
Described herein is the first example of an aliphatic, nonbenzylic hydride shift/cyclization sequence that contains two types of novel sp(3)-C-H functionalization: (1) construction of a tetraline skeleton via [1,5]-hydride shift/cyclization and (2) [1,6]-hydride shift/cyclization to form a five-membered ring (indane derivatives).
Visible-light induced generation of bifunctional nitrogen-centered radicals: a concise synthetic strategy to construct bicyclo[3.2.1] octane and azepane cores
A photocatalytic tandem cyclization of o-alkenylbenzaldehydes using pyridinium salts as the amination reagent is described. A variety of valuable seven-membered nitrogenous heterocyclic skeletons are prepared in modest to excellent yields in concise one-step. This transformation features mild reaction conditions and exceptional functional group tolerance. In addition, combining control experiments and density functional theory (DFT) calculations on the mechanism can explain the reaction selectivity.
Expeditious Construction of a Carbobicyclic Skeleton via sp<sup>3</sup>-C−H Functionalization: Hydride Shift from an Aliphatic Tertiary Position in an Internal Redox Process
作者:Keiji Mori、Shosaku Sueoka、Takahiko Akiyama
DOI:10.1021/ja110520p
日期:2011.3.2
Described herein is the first example of an aliphatic, nonbenzylic hydride shift/cyclization sequence that contains two types of novel sp(3)-C-H functionalization: (1) construction of a tetraline skeleton via [1,5]-hydride shift/cyclization and (2) [1,6]-hydride shift/cyclization to form a five-membered ring (indane derivatives).
Tandem intramolecular carbolithiation–transmetallation: from lithium to copper or boron chemistry
作者:Rosa Ortiz、Miguel Yus
DOI:10.1016/j.tet.2004.12.047
日期:2005.2
with eletrophiles, such as allylic or propargylic halides, acyl chlorides or α,β-unsaturated carbonyl compounds giving the expected compounds 6–10, which are not possible to be obtained directly from the organolithium 3. On the other hand, lithium/boron transmetallation affords the corresponding alkylboronic acid 11 which, after palladium-catalysed Suzuki–Miyaura cross-coupling reaction with different