Silaborative Carbocyclizations of 1,7-Enynes. Diastereoselective Preparation of Chromane Derivatives
作者:You-Cai Xiao、Christina Moberg
DOI:10.1021/acs.orglett.5b03479
日期:2016.1.15
Palladium(0)-catalyzed carbocyclization of 1,7-enynes mediated by (chlorodimethylsilyl)pinacolborane proceeds with 1,8-addition of the silicon and boron functions to give functionalized cyclohexane derivatives with boron attached to the exocyclic olefin. A variety of chromane dervatives are accessible by this method. In contrast to the analogous reactions with 1,6-enynes, the configuration of the newly
Catalytic Dicyanative 5-exo- and 6-endo-Cyclization Triggered by Cyanopalladation of Alkynes
作者:Shigeru Arai、Yuka Koike、Atsushi Nishida
DOI:10.1002/adsc.200900813
日期:2010.3.22
A stereoselective dicyanative 5‐exo‐ and 6‐endo‐cyclization using various enynes has been investigated. The mode of cyclization is critically controlled by the structure of the substrates. For example, N‐allyl derivatives prefer 5‐exo‐cyclization, while methacryloyl amides are transformed to the corresponding lactams with tetra‐substituted carbons at the alpha‐position via 6‐endo‐cyclization. Both
We developed novel one-pot multiple Diels–Alder reactions, which are frequently used in the construction of six-membered rings in functional molecular synthesis. We report triple and double Diels–Alder reactions with styrene derivatives, where the secondary Diels–Alder reaction takes place at a different position from that of the conventional Wagner-Jauregg reaction.
Ruthenium-catalyzed tandem enyne metathesis/hydrovinylation
作者:Jason Gavenonis、Ruben V. Arroyo、Marc L. Snapper
DOI:10.1039/c0cc00008f
日期:——
In situ modification of Grubbs' first-generation metathesis catalyst allows for a tandem enyne metathesis/hydrovinylation that is complementary to the regioselectivity of known ruthenium-catalyzed hydrovinylations.