Gold(I)/(III)-Catalyzed Synthesis of Cyclic Ethers; Valency-Controlled Cyclization Modes
作者:Nobuyoshi Morita、Arisa Yasuda、Motohiro Shibata、Shintaro Ban、Yoshimitsu Hashimoto、Iwao Okamoto、Osamu Tamura
DOI:10.1021/acs.orglett.5b01046
日期:2015.6.5
Strategic use of oxophilic (hard) gold(III) and π-philic (soft) gold(I) catalysts provides access to two types of cyclic ethers from propargylic alcohols. Thus, heating propargylic alcohols with an oxophilic gold(III) catalyst (AuBr3) results in cyclization to afford cyclic ethers bearing an acetylenic moiety, due to coordination of gold(III) to the oxygen of the propargylic hydroxyl group. On the
嗜酸(硬)金(III)和π-亲和(软)金(I)催化剂的战略性使用提供了从炔丙醇中获得两种类型的环醚的途径。因此,由于金(III)与炔丙基羟基的氧的配位,用亲氧的金(III)催化剂(AuBr 3)加热炔丙醇导致环化以提供带有炔属部分的环状醚。另一方面,带有π-亲和金(I)催化剂(Ph 3 PAuNTf 2)的炔丙醇会诱导迈耶-舒斯特重排,以提供α,β-不饱和酮,然后进行金(III)催化的分子内氧杂-迈克尔加成反应由于金(III)与羰基的氧配位,从而得到带有羰基的环状醚。