Diastereodivergent Hydrosilylative Enyne Cyclization Catalyzed by
<scp>
<i>N</i>
‐Heterocyclic Carbene‐Ni
</scp>
(0)
<sup>†</sup>
作者:Meng Yu、Xuefeng Yong、Weiwei Gao、Chun‐Yu Ho
DOI:10.1002/cjoc.202000651
日期:2021.6
activated N-heterocyclic carbene-Ni(0) as a catalyst and R3SiH as silane (IPrCl, syn- : anti-selectivity from up to 98 : 2 to 7 : 93 by Z = O, NH vs. NMs, R1 = n-pentyl). Heterocycles bearing homoallylsilane rather than vinylsilane was obtained chemoselectively. The undesired yet highly competitive reactivity was suppressed, like direct hydrosilylation of alkene and alkyne concurrently. Optionally, the
使用电子激活达到高通用性和广泛范围催化diastereodivergent hydrosilylative烯炔的环化ñ -杂环卡宾-镍(0)作为催化剂和R 3的SiH硅烷(IPR氯,顺式- :抗从多达-选择性至98:2到7:93(Z = O,NH对NMs,R 1 =正戊基)。化学选择性地获得了带有均烯丙基硅烷而不是乙烯基硅烷的杂环。抑制了不希望的但极富竞争性的反应性,例如同时进行烯烃和炔烃的直接氢化硅烷化。可选地,使用IPr Me可以在一锅中进一步还原均烯丙基硅烷产品(EtO)3 SiH (作为配体)和(EtO)3 SiH(作为硅烷),在与上述相同的其他标准条件下,提供了从炔烃获得更多立体中心和更多样化产品结构的实用途径。