Facile synthesis of multisubstituted buta-1,3-dienes via Suzuki–Miyaura and Kumada cross-coupling strategy of 2,4-diiodo-buta-1-enes with arylboronic acids and Grignard reagents
作者:Li-Xiong Shao、Min Shi
DOI:10.1039/b504071j
日期:——
One-pot SuzukiâMiyaura-type and Kumada-type cross-coupling reactions of 2,4-diiodo-buta-1-enes with arylboronic acids and alkyl/aryl magnesium bromides were carried out in the presence of accessibly simple catalysts under mild conditions. As a result, some 1,1,2-trisubstituted buta-1,3-dienes were obtained including the Tamoxifen-type, which have potential adjuvant therapy in women who have suffered from breast cancer and cyclooxygenase-2-type (COX-2-type) inhibitors, some of which have been proved to elicit efficient anti-inflammatory analgesic activities and less adverse gastrointestinal side effects and to be very useful in the prophylactic treatment of a wide variety of cancers and neurodegenerative disorders.
Novel Tunable CuX<sub>2</sub>-Mediated Cyclization Reaction of Cyclopropylideneacetic Acids and Esters for the Facile Synthesis of 4-Halomethyl-2(5<i>H</i>)-furanones and 4-Halo-5,6-dihydro-2<i>H</i>-pyran-2-ones
作者:Xian Huang、Hongwei Zhou
DOI:10.1021/ol026911q
日期:2002.12.1
[GRAPHICS]A mixture of cyclopropylideneacetic acids (or esters) and CuBr2 (or Cul/l(2)) in aqueous acetonitrile afforded 4-substituted 2(5H)-furanones or 3,4-substituted 5,6-dihydro-2H-pyran-2-ones in moderate to good yields. The selectivity of the reaction greatly depended on the reaction temperature.
CuX<sub>2</sub>-Mediated Halogenation of Alkylidenecyclopropanes: A Highly Efficient and Stereoselective Method for the Preparation of<i>Z</i>-2, 4-Dihalobutenes
作者:Xian Huang、Hongwei Zhou、Wanli Chen
DOI:10.1055/s-2003-41480
日期:——
A convenient and efficient method for the synthesis of (Z)-2,4-dihalobutenes, a useful building block in organic synthesis, was reported in good yield by the reaction of alkylidenecyclopropanes and CuX2 (or CuI/I2).