regioselective, stereodivergent catalytic hydroarylation of unsymmetrical dialkyl alkynes with arylboronic acids that allows highly selective access to either the E or Z diastereoisomer of trisubstituted alkenes. The E selectivity is achieved through syn-carbopalladation of the alkyne by Ar–Pd species followed by protodepalladation in which a 2-pyridyl sulfonyl (SO2Py) directing group enables complete
我们报道了不对称的二烷基
炔烃与芳基
硼酸的区域选择性,立体发散性催化氢芳基化反应,从而允许高度选择性地获得三取代烯烃的E或Z非对映异构体。所述Ë选择性是通过实现顺由Ar -
钯物种炔随后protodepalladation,其中2-
吡啶基磺酰基(SO的-carbopalladation 2 PY)引导组使区域选择性的完全控制。通过串联的Pd / Ir序列(包括氢芳基化和E→Z)可获得互补的立体
化学光异构化。最后,通过还原,Julia–Kocienski烯烃化或Cu催化的C(sp 3)–C(sp 2)或C(sp 3)–C(sp 3)交叉偶联容易地除去导向基团,从而可以进行选择性制备立体定义的烯烃和二烯的合成。