Efficient Baylis–Hillman reactions promoted by mild cooperative catalysts and their application to catalytic asymmetric synthesis
作者:Yoichi M.A Yamada、Shiro Ikegami
DOI:10.1016/s0040-4039(00)00125-8
日期:2000.3
Baylis–Hillmanreactions were promoted by mild cooperative catalysts of tributylphosphine with phenols such as (±)-1,1′-bi-2-naphthol (BINOL) in THF to give α-methylene-β-hydroxyalkanones in high yield. The reactions proceeded much faster in the presence of 1,1′-bi-2-naphthol than in its absence. The 1H NMR studies suggested that 1,1′-bi-2-naphthol functions as a Brønsted acid to activate the carbonyl
三丁基膦与酚类的温和协同催化剂(例如(±)-1,1'-联-2-萘酚(BINOL)在THF中)促进了Baylis-Hillman反应,从而以高收率得到α-亚甲基-β-羟基链烷酮。在有1,1'-联-2-萘酚存在下,该反应进行得比在没有它的情况下进行得快得多。的1项1 H NMR研究表明,1,1'-联-2-萘酚用作布朗斯台德酸来激活醛和偏振烯烃的羰基。通过使用三丁基膦与钙手性催化剂的协同催化剂来检查反应在催化不对称合成中的应用,以相当好的收率得到具有相当好的%ee的所需产物。
Azobenzene-Tethered Bis(Trityl Alcohol) as a Photoswitchable Cooperative Acid Catalyst for Morita-Baylis-Hillman Reactions
作者:Tatsushi Imahori、Ryo Yamaguchi、Seiji Kurihara
DOI:10.1002/chem.201201383
日期:2012.8.27
Incorporation of an azobenzene core into tethered bis(tritylalcohol) allows the photoswitchable arrangement of the two tritylalcohol units through photoisomerization of azobenzene. The differently arranged tritylalcohol units change their cooperative function to reflect the positional relationships, and thus, the activity as a cooperativeacid can be controlled by light stimuli (see figure).
Development of a novel Brønsted acid UiO-66 metal–organic framework catalyst by postsynthetic modification and its application in catalysis
作者:Zongcheng Miao、Chao Qi、Allison M. Wensley、Yi Luan
DOI:10.1039/c6ra14365b
日期:——
A novel Bronsted acid derived metal-organicframework (MOF) has been developed to serve as an efficient heterogeneous catalyst for the acetalization and Morita-Baylis-Hillman reaction. Aromatic sulfonic acid groups were successfully...
Tributylphosphine or dimethylphenylphosphine (1-5 mol%) catalyzed the Morita-Baylis-Hillman reaction of 2-cyclopenten-1-one (1) with 1.2 equivalents of formalin proceeded nicely to give 2-hydroxymethyl-2-cyclopenten-1-one (2) within a short period and in an excellent yield. The efficiency of the reaction (yield and time) was strongly dependent on the solvent and the best result was obtained in the case of an aqueous MeOH-CHCl3 solvent system.
A highly effective Morita-Baylis-Hillman (MBH) reaction was developed employing Cu (II) derived Cu3TDPAT as the dual-functional metal-organicframeworks (MOFs) catalyst. Four kinds of copper salts were employed as precursors to synthesize Cu3TDPAT. The resultant Cu3TDPAT MOFs were used as catalysts for the MBH model reaction of 4-fluorobenzaldehyde and 2-cyclopentene-1-one under various reaction conditions
使用 Cu (II) 衍生的 Cu 3 TDPAT 作为双功能金属有机骨架 (MOF) 催化剂,开发了一种高效的 MOrita-Baylis-Hillman (MBH) 反应。以四种铜盐为前驱体合成了Cu 3 TDPAT。得到的 Cu 3 TDPAT MOFs 被用作 4-氟苯甲醛和 2-cyclopentene-1-one 在各种反应条件下的 MBH 模型反应的催化剂。结果表明,硝酸铜衍生的Cu 3 TDPAT-c 是实现高收率(高达99%)的最佳催化剂。由于 Cu 3 TDPAT中存在芳香醛和碱性三嗪基团,Cu 3中的路易斯酸和碱位TDPAT MOF在4-氟苯甲醛和2-环戊烯-1-酮之间形成C-C单键生成苄基甲基丙烯腈产物的反应过程中发挥了重要作用。此外,经过优化,该催化剂对MBH反应表现出良好的催化性能,具有较高的热稳定性、可靠性和可回收性。这种最佳的催化性能显示出进一步发展的巨大潜力。