已经开发了烯烃的高度立体选择性的金(I)催化的顺式-乙烯基环丙烷化。通过7-烯基-1,3,5-环庚烯的逆布氏反应生成的烯丙基金卡宾与烯类反应形成乙烯基环丙烷。这些底物的金(I)催化逆布氏反应通过在比7-芳基-1,3,5-环庚烯反应所需的温度低得多的温度下简单加热进行(75°C vs 120°C) 。新开发的Julia–Kocienski试剂可一步一步从现成的醛或酮合成所需的环庚三烯衍生物。在机理研究的基础上,建立了顺式选择性的立体化学模型。前所未有的金催化顺式异构化-对反式-cyclopropanes还发现和DFT计算研究。
Gold(I)-Catalyzed Synthesis of Indenes and Cyclopentadienes: Access to (±)-Laurokamurene B and the Skeletons of the Cycloaurenones and Dysiherbols
作者:Xiang Yin、Mauro Mato、Antonio M. Echavarren
DOI:10.1002/anie.201708947
日期:2017.11.13
between terminal allenes and aryl or styryl gold(I) carbenes generated by a retro-Buchner reaction of 7-substituted 1,3,5-cycloheptatrienes led to indenes and cyclopentadienes, respectively. These cycloaddition processes have been applied to the construction of the carbon skeleton of the cycloaurenones and the dysiherbols as well as to the total synthesis of (±)-laurokamurene B.
Photoreactions of 2,3-diazatetracyclo[5.3.1.04,11.06,8]undeca-2,9 dienes ; the retro-1,3-dipolar cycloadditions and the nitrogen extrusion reactions
作者:Tsutomu Kamagai、Yoshihiro Ohba、Toshio Mukai
DOI:10.1016/s0040-4039(00)86854-9
日期:——
The photochemical reactions of tetracyclic azocompounds (1a–b) giving 5a–b and 8a–bvia diazoethane derivatives (6a–b) were investigated in addition to the nitrogenextrusion reactions leading to tetracyclo[4.3.0.02,9.05,7nonenes (4a–b).