I / I III催化使用新型C 2对称间苯二酚衍生物进行烯烃的对映选择性催化邻位二氟化反应。通过Selectfluor氧化和添加廉价的HF-胺络合物,可以原位生成ArI III F 2物种进行催化剂转换。此过程中使用的HF:胺比率为布朗选择性酸度的区域选择性正交性提供了一个解决方案。公开了从1,1-二氟化途径(基因)向所需的1,2-二氟化途径(邻位)的选择性逆转(两个方向均> 20:1)。用电子不足的苯乙烯进行验证有助于产生古老的CF 3的手性生物等排体药物发现中普遍使用的单元(20个示例,最高94:06 er)。还使用p- TolI(高达> 95%的收率)显示了反应的非手性变体。
Enantioselective, Catalytic Vicinal Difluorination of Alkenes
作者:Felix Scheidt、Michael Schäfer、Jérôme C. Sarie、Constantin G. Daniliuc、John J. Molloy、Ryan Gilmour
DOI:10.1002/anie.201810328
日期:2018.12.10
The enantioselective, catalytic vicinal difluorination of alkenes is reported by II/IIII catalysis using a novel, C2‐symmetric resorcinol derivative. Catalyst turnover via in situ generation of an ArIIIIF2 species is enabled by Selectfluor oxidation and addition of an inexpensive HF–amine complex. The HF:amine ratio employed in this process provides a handle for regioselective orthogonality as a function
I / I III催化使用新型C 2对称间苯二酚衍生物进行烯烃的对映选择性催化邻位二氟化反应。通过Selectfluor氧化和添加廉价的HF-胺络合物,可以原位生成ArI III F 2物种进行催化剂转换。此过程中使用的HF:胺比率为布朗选择性酸度的区域选择性正交性提供了一个解决方案。公开了从1,1-二氟化途径(基因)向所需的1,2-二氟化途径(邻位)的选择性逆转(两个方向均> 20:1)。用电子不足的苯乙烯进行验证有助于产生古老的CF 3的手性生物等排体药物发现中普遍使用的单元(20个示例,最高94:06 er)。还使用p- TolI(高达> 95%的收率)显示了反应的非手性变体。
US4173706A
申请人:——
公开号:US4173706A
公开(公告)日:1979-11-06
Catalytic <i>Geminal</i> Difluorination of Styrenes for the Construction of Fluorine-rich Bioisosteres
A geminal difluorination of alkenes based on I(I)/I(III) catalysis is disclosed, which is compatible with a range of electronically and substitutionally diverse styrenes (27 examples, up to 89% yield). Employing inexpensive p-Toll as the organocatalyst, turnover is enabled by Selectfluor-mediated oxidation to generate the ArIF2 species in situ. Extension to include alpha-substituted styrenes bearing fluorine-containing groups is disclosed and provides an expansive platform for the generation of fluorine-rich architectures.
Yagupol'skii,L.M. et al., Journal of Organic Chemistry USSR (English Translation), 1971, vol. 7, p. 737 - 739