Regioselective Formation of (
<i>E</i>
)‐β‐Vinylstannanes with a Topologically Controlled Molybdenum‐Based Alkyne Hydrostannation Catalyst
作者:Kyle A. Mandla、Curtis E. Moore、Arnold L. Rheingold、Joshua S. Figueroa
DOI:10.1002/anie.201802397
日期:2018.6.4
long‐standing challenge in transition‐metal‐catalyzed alkyne hydrostannation. Herein, we report a well‐defined molybdenum‐based system featuring two encumbering m‐terphenyl isocyanides that reliably and efficiently delivers (E)‐β‐vinylstannanes from a range of terminal and internal alkynes with high regioselectivity. The system is particularly effective for aryl alkynes and can discriminate between alkyl chains
(E)-β-乙烯基锡烷的区域选择性形成一直是过渡金属催化的炔烃氢化的长期挑战。在本文中,我们报道了良好定义的基于钼的系统具有两个拖累米三联苯异腈该可靠且有效地传递(ë)从一系列具有高的区域选择性末端和内部炔-β-乙烯基锡烷。该体系对于芳基炔烃特别有效,并且可以在不对称取代的二烷基炔烃中区分低位阻的烷基链。该系统的催化氢锡化还具有电子效应,当炔烃底物上存在吸电子基团时,会导致区域选择性降低。