Palladium-catalyzed reactions of vinylidenecyclopropanes with acetic acid
作者:Jian-Mei Lu、Min Shi
DOI:10.1016/j.tet.2006.07.052
日期:2006.9
Pd(PPh3)4-catalyzed reactions of vinylidenecyclopropanes 1 with acetic acid proceeded smoothly at 80 °C in toluene to give the corresponding acetylated dienes 2 in moderate to good yields in the presence of DPEphos ligand. The plausible mechanism is proposed on the basis of the control and deuterium labeling experiments.
Montmorillonite K-10-catalyzed intramolecular rearrangement of vinylidenecyclopropanes
作者:Jian-Mei Lu、Min Shi
DOI:10.1016/j.tet.2007.05.090
日期:2007.8
A series of naphthalene, indene, and 6aH-benzo[c]fluorene derivatives are synthesized by intramolecular rearrangement of vinylidenecyclopropanes using a heterogeneous solid acid catalyst, montmorilloniteK-10, under mild reaction conditions in good to excellent yields. The solid acidic catalyst, montmorilloniteK-10, can be recovered and reused.
在温和的反应条件下,采用多相固体酸催化剂蒙脱石K-10,通过亚乙烯基环丙烷的分子内重排反应,以良好的收率获得了一系列的萘,茚和6a H-苯并[ c ]芴衍生物。固体酸性催化剂蒙脱石K-10可回收再利用。
Reactions of Vinylidenecyclopropanes with Diphenyl Diselenide in the Presence of AIBN and Further Transformation To Produce New Naphthalene Derivatives
作者:Min Shi、Jian-Mei Lu
DOI:10.1021/jo0522613
日期:2006.3.1
mild conditions. The transformation of 4 to the corresponding methylenecyclopropanes 6 was achieved by treatment with hydrogen peroxide (H2O2) in toluene, and these were further transformed to the corresponding naphthalene derivatives 7 by treatment with 30 mol % of TfOH in dichloromethane.
Reactions of Arylvinylidenecyclopropanes with Bromine and Iodine
作者:Min Shi、Ming Ma、Zhi-Bin Zhu、Li Wei
DOI:10.1055/s-2006-947337
日期:2006.8
Reactions of arylvinylidenecyclopropanes 1 with equimolar amount of bromine or iodine at low temperature produced the corresponding addition products 2,3 and 5, 6 in moderate to good yields at -40 °C and -100 °C, respectively. On the other hand, the reactions of 1 with equimolar amount of iodine gave the corresponding iodinated naphthalene derivatives 4 via the corresponding addition products 3 under
芳基亚乙烯基环丙烷 1 与等摩尔量的溴或碘在低温下反应,分别在 -40 °C 和 -100 °C 下以中等至良好的产率生成相应的加成产物 2,3 和 5、6。另一方面,1与等摩尔量的碘在25°C的类似条件下通过相应的加成产物3反应得到相应的碘化萘衍生物4。已经介绍了加成产物 6a 的进一步转化。
Regiocontrolled Halohydroxylations of Bicyclic Vinylidenecyclopropanes: A Versatile Strategy for the Construction of Diverse Highly Functionalized Carbocyclic Scaffolds
means of proximalcleavage of the cyclopropane ring. In addition, vinylidenecyclopropanes that bore one aryl group at the cyclopropyl ring reacted with NBS or I2 at room temperature, thereby producing the corresponding divinyl ketones 4 in moderate to good yields with excellent E selectivity. Unexpectedly, 2‐vinylic cyclohex‐2‐enols 6 were generated through a very different distal CC bondcleavage of the