One-Pot, Three-Step Synthesis of Cyclopropylboronic Acid Pinacol Esters from Synthetically Tractable Propargylic Silyl Ethers
作者:Jonathan A. Spencer、Craig Jamieson、Eric P. A. Talbot
DOI:10.1021/acs.orglett.7b01778
日期:2017.7.21
propargylic silyl ethers can be converted to complex cyclopropylboronic acid pinacol esters in an efficient one-pot procedure. Terminal acetylenes undergo a Schwartz’s reagent catalyzed hydroboration; subsequent addition of further Schwartz’s reagent and Lewis acid-mediated activation of neighboring silyl ether allows cyclization to access a range of cyclopropylboronic acid pinacol esters. The scope includes
A manufacturing method for one of, or a mixture of, an optically active allylboron compound and racemic or optically active boryl cyclopropane, including a coupling reaction, in the presence of a catalyst, between allyl compound and diboron compound. It is preferred that a copper (I) complex is used as the catalyst. It is preferred that a counterion of the copper (I) complex is an alkoxide or a hydride. It is preferred that the copper (I) complex has a phosphine ligand. It is preferred that the phosphine ligand is a chiral phosphine ligand.