Asymmetric Allylic Monofluoromethylation and Methylation of Morita-Baylis-Hillman Carbonates with FBSM and BSM by Cooperative Cinchona Alkaloid/FeCl2 Catalysis
yields with high ee values (see scheme, (DHQD)2AQN=hydroquinidine(anthraquinone‐1,4‐diyl) diether). The cooperativecatalysis of bis(cinchona alkaloid) and Lewis acid, particularly FeCl2, was effective for these transformations and gave the monofluoromethylation products with over 90 % ee and methylation products with up to 97 % ee.
Core-Structure-Motivated Design of a Phosphine-Catalyzed [3 + 2] Cycloaddition Reaction: Enantioselective Syntheses of Spirocyclopenteneoxindoles
作者:Bin Tan、Nuno R. Candeias、Carlos F. Barbas
DOI:10.1021/ja110147w
日期:2011.4.6
A novel organocatalytic asymmetric [3+2] cycloaddition reaction between methyleneindolinones and allylic compounds yielding complex spirocyclopentaneoxindoles has been developed. It provides extraordinary levels of enantioselective control involving a chiral phosphine as a nucleophilic organocatalyst. Simple precursors were used under mild conditions to construct oxindole derivatives with high enantiopurity
Chemoselective S<sub>N</sub>2′ Allylations of Detrifluoroacetylatively In Situ Generated 3-Fluoroindolin-2-one-Derived Tertiary Enolates with Morita–Baylis–Hillman Carbonates
作者:Yi Zhu、Haibo Mei、Jianlin Han、Vadim A. Soloshonok、Jie Zhou、Yi Pan
DOI:10.1021/acs.joc.7b02409
日期:2017.12.15
n derivatives has been described. The SN2′ substitution takes place in a highly chemoselective manner as no corresponding SN2 products were observed in the reaction mixtures. Due to the excellent stereochemical outcome, the reactions seem to have an apparent synthetic value for the preparation of structurallynewfluorinated oxindoles.
已经描述了在未催化的与森田-贝利斯-希尔曼衍生物的未催化反应中,原位生成的三氟乙酰化叔三氟乙酰基的S N 2'反应类型的第一个例子。在S Ñ 2'取代在一个高度化学选择性地无相应的S Ñ 2产物在反应混合物中观察到的。由于出色的立体化学结果,该反应对于制备结构上新的氟化羟吲哚似乎具有明显的合成价值。
A Highly Regio- and Diastereoselective Phosphane-Catalyzed [3+2] Annulation of Morita-Baylis-Hillman Carbonates with Cyclic<i>N</i>-Acyl Ketimines
作者:Li-Jun Yang、Hua Cai、Jing Nie、Jun-An Ma
DOI:10.1002/ejoc.201300342
日期:2013.7
A highlyregio- and diastereoselectivephosphane-catalyzed [3+2] annulation of Morita–Baylis–Hillman (MBH) carbonates with cyclic N-acyl-substituted ketimines was developed. In the presence of the catalyst PBu3 (10 mol-%), a series of N-fused tricyclic products were obtained in excellent yields and diastereoselectivities under mild conditions. An example of a catalytic enantioselective annulation is