A general and atom‐economical synthesis of 1,1‐diborylalkanes fromalkenes and a borane without the need for an additional H2 acceptor is reported for the first time. The key to our success is the use of an earth‐abundant zirconium‐based catalyst, which allows a balance of self‐contradictory reactivities (dehydrogenative boration and hydroboration) to be achieved. Our method avoids using an excess
Synthesis of 1,1-Organodiboronates
via Rh(I)Cl-Catalyzed Sequential Regioselective Hydroboration
of 1-Alkynes
作者:Kohei Endo、Takanori Shibata、Munenao Hirokami
DOI:10.1055/s-0028-1088131
日期:——
A Rh(I)Cl-DPPB-complex-catalyzed sequential hydroboration of aryl alkynes and aliphatic alkynes was achieved. The reaction proceeded with almost perfect regioselectivity to afford 1,1-organodiboronate compounds in moderate to good yield.
Regio- and chemoselective hydroboration of terminal alkynes with pinacolborane catalyzed by organo rare earth metal complexes
作者:Muhammad Asif Iqbal、Xiangqian Yan、Ruoling Li、Fu Zhijia、Shaowen Zhang、Xiaofang Li
DOI:10.1039/d3nj04957d
日期:——
chemoselective hydroboration of terminal alkynes with pinacolborane by a series of constrained-geometry catalyst-type or CGC-type rareearthmetal monoalkyl complexes. This protocol offers a 100% atom-efficient and straightforward route for the synthesis of a variety of (E)-1-alkenylborons with the advantages such as high yield, high E-selectivity up to >99.9%, multiple metal center, broad substrate scope
我们在此报道了通过一系列受限几何催化剂型或CGC型稀土金属单烷基配合物对末端炔烃与频那醇硼烷进行区域和化学选择性硼氢化反应。该方案为合成各种( E )-1-烯基硼提供了100%原子效率且简单的路线,具有产率高、E选择性高达>99.9%、多金属中心、底物广泛等优点适用范围、广泛的官能团耐受性,并且不需要溶剂。( E )-1-烯基硼的克级合成和随后转化为几种功能化合物表明了这种合成方法的实际应用。通过ESI-MS、同位素标记实验和原位 1 H NMR 光谱探索了反应机理。