Stepwise Suzuki−Miyaura Cross‐Coupling of Triborylalkenes Derived from Alkynyl−B(dan)s: Regioselective and Flexible Synthesis of Tetrasubstituted Alkenes
作者:Tomohiro Tani、Naomi Takahashi、Yuuki Sawatsugawa、Mana Osano、Teruhisa Tsuchimoto
DOI:10.1002/adsc.202001116
日期:2021.4.27
tetrasubstituted alkenes with desired carbon frameworks at desired positions can be prepared in high yields. For example, an alkene with four distinct aryl groups, p‐MeOC6H4, p‐CF3C6H4, p‐MeC6H4, and p‐NCC6H4, was obtained in 71% overall yield via six steps, starting with the dehydrogenative borylation of p‐MeC6H4C≡CH with HB(dan). Moreover, a variety of tetrasubstituted alkenes, including regio‐
合成了具有三个不同反应性的硼烷基的烯烃,然后逐步与芳基卤化物进行区域选择性交联,得到四取代的烯烃。关键的三硼烷基烯烃衍生自乙炔基B(dan)s与B 2(pin)2的铂催化二硼酸酯化反应。由于从炔基-B(dan)s开始的每个步骤都具有出色的区域选择性和反应效率,因此可以高收率制备在所需位置具有所需碳骨架的四取代烯烃。例如,具有四个不同芳基的烯烃,p- MeOC 6 H 4,p- CF 3 C 6 H 4,p-MeC 6 ħ 4,和p -NCC 6 ħ 4,经六个步骤以71%的总产率获得,先从的脱氢硼化p -MeC 6 ħ 4 C≡CH与HB(旦)。此外,通过制定的策略可以使用多种四取代烯烃,包括上述四芳基烯烃的区域和立体异构体,AIE活性TPTPE及其衍生物,以及著名的乳腺癌药物(Z)-他莫昔芬。