The Baylis–Hillman acetates in organic synthesis: Unprecedented sodium nitrite induced intramolecular Friedel–Crafts cyclization of secondary nitro compounds
作者:Deevi Basavaiah、Daggula Mallikarjuna Reddy
DOI:10.1039/c4ra03573a
日期:——
Unprecedented sodium nitrite mediated intramolecularFriedel–Craftscyclization of alkyl (E)-2-arylidene-4-nitroalkanoates and (E)-3-arylidene-5-nitroalkan-2-ones derived from Baylis–Hillman acetates, providing a facile protocol for synthesis of naphthalenes, phenanthrenes, and carbazoles has been described.
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。
A PHOTOCHEMICAL REACTION OF 2-ALKOXY-3-BROMO-1,4-NAPHTHOQUINONE WITH 1,1-DIARYLETHYLENE—A NOVEL SYNTHETIC METHOD OF 5-ARYL-7,12-BENZ (<i>a</i>) ANTHRAQUINONES
作者:Kazuhiro Maruyama、Tetsuo Otsuki
DOI:10.1246/cl.1975.87
日期:1975.1.5
5-Aryl-7,12-benz[a]anthraquinone derivatives (6) was obtained in good yields in the photochemical reaction of 2-alkoxy-3-bromo-1,4-naphthoquinone with 1,1-diarylethylene.
Ni-Catalyzed Reduction of Inert C−O Bonds: A New Strategy for Using Aryl Ethers as Easily Removable Directing Groups
作者:Paula Álvarez-Bercedo、Ruben Martin
DOI:10.1021/ja106943q
日期:2010.12.15
An efficient Ni-catalyzed protocol for the reductive cleavage of inert C-O bonds has been developed. The method is characterized by its simplicity and wide scope, thereby allowing the use of aryl ethers as easily removable directing groups in organic synthesis.