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。
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。
Dehydrative Cross-Coupling of Allylic Alcohols with Alkynes
the directly dehydrative cross-coupling of allylicalcohols with terminal alkynes was developed. This calcium salt cocatalyst facilitates the oxidative addition of the palladium catalyst (1 mol %) to the C-OH bond. Then, the in situ-generated hydroxide ion deprotonates the terminal alkynes to promote the formation of the allylalkynylpalladium intermediate, liberating water as the only byproduct. This
Acyloins from Morita–Baylis–Hillman adducts: an alternative approach to the racemic total synthesis of bupropion
作者:Giovanni W. Amarante、Patrícia Rezende、Mayra Cavallaro、Fernando Coelho
DOI:10.1016/j.tetlet.2008.04.040
日期:2008.6
In this Letter, we describe an easy and straightforward strategy for the preparation of acyloins (α-hydroxyketones) from Morita–Baylis–Hillman adducts, based on a Curtius rearrangement. Different acyloins were obtained with good overall yield (>40% for three steps). To exemplify the synthetic usefulness of this strategy, total synthesis of (±)-bupropion, a dopamine, and nor-epinefrine reuptake inhibitor
In the present work, 103 novel acyclic nucleosides were designed, synthesized, and evaluated for their anticancer activities in vitro and in vivo. The structure–activity relationship (SAR) studies revealed that most target compounds inhibited the growth of colon cancer cells in vitro, of which 3-(6-chloro-9H-purin-9-yl)dodecan-1-ol (9b) exhibited the most potent effect against the HCT-116 and SW480
在目前的工作中,设计、合成了 103 种新型无环核苷,并评估了它们的体外和体内抗癌活性。构效关系(SAR)研究表明,大多数目标化合物在体外均能抑制结肠癌细胞的生长,其中3-(6-氯-9 H -purin-9-yl)dodecan-1-ol ( 9b )对 HCT-116 和 SW480 细胞表现出最有效的作用,IC 50值分别为 0.89 和 1.15 μM。此外,所有( R )-构型的无环核苷衍生物与其( S )-对应物相比都表现出更有效的抗癌活性。机理研究表明,化合物9b通过线粒体膜去极化引发癌细胞系凋亡,并有效抑制集落形成。重要的是,化合物9b可抑制小鼠模型中 SW480 异种移植物的生长,且全身毒性较低。这些结果表明,无环核苷化合物可作为强效且有效的抗癌药物,而化合物9b可能作为一种有前途的先导化合物,在未来的抗癌药物发现中值得进一步关注。
Visible-Light-Induced Trifluoromethylation of Allylic Alcohols
organic photoredox-catalyzed dehydroxylative trifluoromethylation of allylic alcohols was developed in an environmentally benign manner. In this reaction, the readily available CF3SO2Na was selected as the trifluoromethylation reagent. The in situ generated byproduct SO2 was reutilized to activate C–OH bond, which enabled this dehydroxylative trifluoromethylation to be performed conveniently. A variety
以环境友好的方式开发了有机光氧化还原催化的烯丙醇脱羟基三氟甲基化。本反应选用易得的CF 3 SO 2 Na作为三氟甲基化试剂。在原位通过产品生成SO 2被再利用来激活C-OH键,这使此dehydroxylative三氟甲基化将被方便地进行。以高产率和优异的立体选择性获得了多种多功能化的 CF 3 -烯丙基化合物。