preparation of allylic phosphorusylides directly from Morita–Baylis–Hillman (MBH) alcohols in an environmentally benign manner was developed. With the assistance of a calcium catalyst, the SN2′ process between phosphines and allylic alcohols occurred smoothly, delivering allylic phosphorus salts and calcium-stabilized hydroxide ions. Then, in situ deprotonation gave the allylic phosphorusylides with water as
开发了一种以环境友好的方式直接从森田-贝利斯-希尔曼(MBH)醇制备烯丙基磷酰化物的新策略。在钙催化剂的辅助下,膦与烯丙基醇之间的S N 2'过程顺利进行,并释放出烯丙基磷盐和钙稳定的氢氧根离子。然后,原位去质子化得到烯丙基磷酰化物,水是唯一的副产物。官能化的1,3-二烯部分可通过Wittig烯化作用捕获酰基化物而方便地获得。
Palladium-Catalyzed Cross-Coupling Reaction of Diazo Compounds and Vinyl Boronic Acids: An Approach to 1,3-Diene Compounds
作者:Yamu Xia、Ying Xia、Zhen Liu、Yan Zhang、Jianbo Wang
DOI:10.1021/jo5012703
日期:2014.8.15
A palladium-catalyzed oxidative cross-coupling of vinyl boronic acids and cyclic α-diazocarbonyl compounds has been reported. The reaction constitutes an efficient method for the synthesis of 1,3-diene compounds bearing a ring structure. Mechanistically, the reaction involves migratory insertion of palladium carbene as the key step.
An efficient synthesis of poly-substituted benzene and tricyclo[3.2.1.02,7]oct-3-ene derivatives starting from Morita–Baylis–Hillman adducts
作者:Cheol Hee Lim、Sung Hwan Kim、Ka Hyun Park、Junseong Lee、Jae Nyoung Kim
DOI:10.1016/j.tetlet.2012.11.020
日期:2013.1
Various poly-substituted benzenes including terphenyl, quaterphenyl, and quinquephenyl were synthesized starting from the Morita–Baylis–Hillmanbromides. The synthesis was carried out via a three-step protocol, namely, a sequential Wittigreaction, Diels–Alder reaction with DMAD, and an aerobic oxidation.
Palladium catalyzed reactions of α-bromo-α,β-unsaturated carbonyl compounds with 1-(E)-alkenylboronic acids
作者:Neudo Urdaneta、Jacqueline Ruíz、Antonio J. Zapata
DOI:10.1016/0022-328x(94)87030-6
日期:1994.1
A new synthesis of functionalized 1,3-dienes is described based on the palladium catalyzed coupling reaction of 1-(E)-alkenylboronic acids with alpha-bromo-alpha,beta-unsaturated carbonyl compounds.