Ruthenium-Catalyzed Decarboxylative Allylation of Nonstabilized Ketone Enolates
摘要:
Bipyridyl(pentamethylcyclopentadienyl)ruthenium chloride is an efficient catalyst for the formal [3,3] rearrangement of allyl beta-ketoesters. The mechanism of the transformation involves formation of pi-allyl ruthenium intermediates, which are selectively attacked at the more substituted allyl terminus by freely diffusing enolates. Decarboxylation of beta-ketocarboxylates allows generation of enolates under extremely mild conditions.
that of the previously reported examples. The developed reaction system displays improved regioselectivity and enantioselectivity and a broad substratescope. Mechanisticstudies using NMR experiments, substrate-structure/reactivity relationship studies, and cross-over experiment reveal a possible reaction pathway involving the enolate of the β-keto acid.
Ruthenium-Catalyzed Decarboxylative Insertion of Electrophiles
作者:Chao Wang、Jon A. Tunge
DOI:10.1021/ol050466s
日期:2005.5.1
A ruthenium complex, Cp*Ru(bipyridyl)CI, has been developed as a catalyst for the first regioselective tandem Michael addition-allylic alkylation of activated Michael acceptors. The net transformation is the decarboxylative insertion of Michael acceptors into allyl beta-ketoesters.
Dihydropyridine derivative
申请人:Ajinomoto Co., Inc.
公开号:US06350766B1
公开(公告)日:2002-02-26
Dihydropyridine derivatives of the following formula, analogs thereof and pharmaceutically acceptable salts thereof have an activity of selectively inhibiting the action of N-type calcium channel. They are used as remedies for various diseases relating to the N-type calcium channel such as encephalopathies caused by the ischemia in the acute phase after the onset of cerebral infarction, cerebral hemorrhage or the like, Alzheimer's disease, etc.
Ruthenium-Catalyzed Decarboxylative Allylation of Nonstabilized Ketone Enolates
作者:Erin C. Burger、Jon A. Tunge
DOI:10.1021/ol049097a
日期:2004.7.1
Bipyridyl(pentamethylcyclopentadienyl)ruthenium chloride is an efficient catalyst for the formal [3,3] rearrangement of allyl beta-ketoesters. The mechanism of the transformation involves formation of pi-allyl ruthenium intermediates, which are selectively attacked at the more substituted allyl terminus by freely diffusing enolates. Decarboxylation of beta-ketocarboxylates allows generation of enolates under extremely mild conditions.