通过不对称偕二硼烷的化学选择性氧化获得 MIDA 酰基硼酸盐的模块化和简洁方法:解锁对新型酰基硼的访问†
摘要:
酰基硼酸盐是一类非常有趣且稀有的有机硼酸盐。在温和条件下从容易获得的底物合成这些化合物并获得新型酰基硼一直具有挑战性。我们报告了一种使用不对称偕二硼烷作为关键中间体从末端炔烃/烯烃或乙烯基硼酸酯制备各种 MIDA 酰基硼酸酯的新颖而简洁的途径。该策略的高模块化和温和条件允许轻松获得具有脂肪族、芳香族以及更稀有的杂芳香族、炔基和 α,β-不饱和支架的酰基硼酸盐。据我们所知,这是首个关于双硼化学选择性氧化以及合成 α,β-不饱和酰基硼酸盐的报道。
Automated library synthesis of cyclopropyl boronic esters employing diazomethane in a tube-in-tube flow reactor
作者:Hannes F. Koolman、Stanislaw Kantor、Andrew R. Bogdan、Ying Wang、Jeffrey Y. Pan、Stevan W. Djuric
DOI:10.1039/c6ob00715e
日期:——
The efficient synthesis of cyclopropyl boronic esters in library format using a diazomethane flow reactor has been achieved. A pivotal component of the system is a fully automated tube-in-tube reactor allowing for safe handling of hazardous diazomethane on repeated small scale and for the generation of larger quantities of product. The setup enables the repeated execution of Pd-catalyzed cyclopropanation
A modular and concise approach to MIDA acylboronates <i>via</i> chemoselective oxidation of unsymmetrical geminal diborylalkanes: unlocking access to a novel class of acylborons
organoboronates. Synthesis of these compounds from readily available substrates under mild conditions and access to novel classes of acylborons has been challenging. We report a novel and concise route to various MIDA acylboronates from terminal alkynes/alkenes or vinyl boronic esters using unsymmetrical geminal diborylalkanes as key intermediates. The high modularity and mild conditions of this strategy allowed
酰基硼酸盐是一类非常有趣且稀有的有机硼酸盐。在温和条件下从容易获得的底物合成这些化合物并获得新型酰基硼一直具有挑战性。我们报告了一种使用不对称偕二硼烷作为关键中间体从末端炔烃/烯烃或乙烯基硼酸酯制备各种 MIDA 酰基硼酸酯的新颖而简洁的途径。该策略的高模块化和温和条件允许轻松获得具有脂肪族、芳香族以及更稀有的杂芳香族、炔基和 α,β-不饱和支架的酰基硼酸盐。据我们所知,这是首个关于双硼化学选择性氧化以及合成 α,β-不饱和酰基硼酸盐的报道。
Speciation Control During Suzuki-Miyaura Cross-Coupling of Haloaryl and Haloalkenyl MIDA Boronic Esters
作者:James W. B. Fyfe、Elena Valverde、Ciaran P. Seath、Alan R. Kennedy、Joanna M. Redmond、Niall A. Anderson、Allan J. B. Watson
DOI:10.1002/chem.201500970
日期:2015.6.8
Boronic acid solution speciation can be controlled during the Suzuki–Miyauracross‐coupling of haloaryl N‐methyliminodiacetic acid (MIDA) boronic esters to enable the formal homologation of boronic acid derivatives. The reaction is contingent upon control of the basic biphase and is thermodynamically driven: temperature control provides highly chemoselective access to either BMIDA adducts at room temperature