Palladium-Catalyzed CC Bond Formation To Construct 1,4-Diketones under Mild Conditions
作者:Chao Liu、Yi Deng、Jing Wang、Yingying Yang、Shan Tang、Aiwen Lei
DOI:10.1002/anie.201101638
日期:2011.8.1
palladium‐catalyzed reaction between the bulky α‐carbon centers of two ketones has led to the construction of 2,3‐diaryl‐1,4‐diketones by employing α‐chloroketones as electrophiles and zinc ketone enolates as nucleophiles (see scheme). This reaction allows the synthesis of bulky 1,4‐diketones and is complementary with classic nucleophilic substitution reactions.
Synthesis and photoluminescence properties of star-shaped 2,3,6,7-tetrasubstituted benzo[1,2-b:4,5-b′]difurans
作者:Mariusz J. Bosiak、Piotr Trzaska、Dariusz Kędziera、Jörg Adams
DOI:10.1016/j.dyepig.2016.01.025
日期:2016.6
Elongated benzodifuran derivatives were obtained by the reaction of tetrabromobenzodifuran with aryl-, heteroaryl- or vinylboronic acid MIDA esters in the presence of Pd(dppf)Cl2 catalyst, and tripotassium phosphate as a base in 1,4-dioxane/water mixture. The star-shaped products, obtained in 37–99% yield, exhibit the UV–Vis fluorescence with high quantum yields, 69–100%. Due to the long-chained alkyl groups
描述了α-卤代酮与对苯二酚的新反应,导致高度荧光的星形2,3,6,7-四取代苯并二呋喃。因此,由1,2-得到苯并二呋喃星的核心2,3,6,7-四(4-溴苯基)-4,8-二癸基苯并[1,2- b:4,5- b ']二呋喃。在没有溶剂的氯化锌存在下,双(4-溴苯基)-2-氯乙酮和2,5-二氢对苯二酚。在Pd(dppf)Cl 2存在下,四溴苯并二呋喃与芳基,杂芳基或乙烯基硼酸MIDA酯反应可制得伸长的苯并二呋喃衍生物。催化剂和磷酸三钾盐作为1,4-二恶烷/水混合物的碱。以37–99%的产率获得的星形产品显示出具有高量子产率(69–100%)的UV-Vis荧光。由于位置4和8处的长链烷基,这些高度π共轭的产物可溶于许多有机溶剂。
Iddon,B. et al., Chimica Therapeutica, 1970, vol. 5, p. 149 - 154