报道了铜催化下 α,β-不饱和砜的不同官能化。使用铜催化剂、磷酸烯丙酯、双(频哪醇)二硼和LiOMe实现了烯基砜的非对映选择性硼基化烯丙基化。在该方法中,将铜-硼基络合物添加到烯基砜中并随后进行烯丙基取代,使得硼烯丙基化产物具有良好的产率和优异的顺式非对映选择性。相反,更强的碱(KO t -Bu)通过消除磺酰基和硼基基团,进一步促进反应形成( E )-跳过的二烯。
Asymmetric synthesis of γ-chiral borylalkanes <i>via</i> sequential reduction/hydroboration using a single copper catalyst
作者:Jung Tae Han、Jin Yong Lee、Jaesook Yun
DOI:10.1039/d0sc03759a
日期:——
The synthesis of γ-chiral borylalkanes through copper-catalyzedenantioselective SN2′-reduction of γ,γ-disubstituted allylic substrates and subsequent hydroboration was reported. A copper–DTBM-Segphos catalyst produced a range of γ-chiral alkylboronates from easily accessible allylic acetate or benzoate with high enantioselectivities up to 99% ee. Furthermore, selective organic transformations of the
Quaternary Carbon Stereogenic Centers through Copper-Catalyzed Enantioselective Allylic Substitutions with Readily Accessible Aryl- or Heteroaryllithium Reagents and Aluminum Chlorides
作者:Fang Gao、Yunmi Lee、Kyoko Mandai、Amir H. Hoveyda
DOI:10.1002/anie.201005124
日期:2010.11.2
of the notorious aryls is solved: The first efficient catalytic and enantioselective method for allylicsubstitutions that furnish quaternary carbon stereogenic centers by additions of aryl‐ or heteroarylmetals is reported (see scheme). Highly site‐ and enantioselective processes begin with readily available organolithium reagents.
Copper‐Catalyzed B(dan)‐Installing Allylic Borylation of Allylic Phosphates
作者:Hiroto Yoshida、Yuya Murashige、Itaru Osaka
DOI:10.1002/adsc.201900342
日期:2019.5.14
γ‐Selective B(dan)‐installing allylic borylation was found to proceed efficaciously by the reaction of an unsymmetrical diboron, (pin)B−B(dan), with allylic phosphates under copper catalysis. The resulting allyl−B(dan) was convertible into 1,3‐, 1,2‐, or 1,1‐diborylalkanes with different boron‐Lewis acidity by B(pin)‐installing hydroboration, and its C(sp3)−B(dan) bond turned out to be preferentially