Palladium-catalyzed reactions of various 2-bromo-3-exo-methylenecycloalkenes with a stabilized nucleophile were examined. When the carbocycles were nine-membered or larger, the corresponding endocyclic allenes were isolated in excellent yields. In a reaction of the eight-membered cyclic substrate, initial formation of a cycloocta-1,2-diene derivative was detected; however, it dimerized slowly. The
Catalytic Asymmetric Michael Reactions of α,β‐Unsaturated Ketones with Sulfonyl‐Containing Nucleophiles: Chiral Synthesis of (
<i>R</i>
)‐Muscone and (
<i>S</i>
)‐Celery Ketone
作者:Xiaomin Sun、Feng Yu、Tingting Ye、Xinmiao Liang、Jinxing Ye
DOI:10.1002/chem.201002418
日期:2011.1.10
An amine worth its salt: A highly enantioselectiveMichaeladdition reaction of α,β‐unsaturated ketones with the sulfonyl‐containing nucleophiles bis(phenylsulfonyl)methane and 1‐(phenylsulfonyl)propan‐2‐one, catalyzed by a chiral primary amine salt, has been developed and gives excellent enantioselectivities (see scheme). The methodology has successfully demonstrated its synthetic utility in the chiral
Copper-catalyzed asymmetric conjugate addition with Grignard reagents and SimplePhos ligands
作者:Laëtitia Palais、Alexandre Alexakis
DOI:10.1016/j.tetasy.2009.11.016
日期:2009.12
Herein we report the copper-catalyzedasymmetricconjugateaddition of Grignard reagents to cyclic and acyclic enones, with SimplePhos as chiral ligands. A variety of Grignard reagents can be added to a range of cyclic and acyclic enones, with moderate to good enantioselectivities (ee’s up to 86%).
Zincate-mediated rearrangement reaction of 2-(1-hydroxyalkyl)-1-alkylcyclopropanol
作者:Kenichi Nomura、Seijiro Matsubara
DOI:10.1039/b901043b
日期:——
A rearrangement of lithium alkoxide of 2-(1-hydroxyalkyl)-1-alkylcyclopropanol into lithium alkoxide of vic-diol was mediated with an organozincate complex.
3-amino-2-hydroxybornane derivatives, asymmetric Michael reaction using
申请人:Nippon Mining Co., Ltd.
公开号:US05146003A1
公开(公告)日:1992-09-08
A 3-amino-2-hydroxybornane derivative represented by formula (I): ##STR1## wherein R represents a furfuryl group, a 1-methylpyrrolylmethyl group, or a benzyl group, is disclosed. The compound is useful as a ligand in an asymmetric Michael reaction, particularly for the production of an optically active muscone.