Regioselective preferential C H activation of sterically hindered 1,3-dienes over [4+2] cycloaddition
作者:Rakesh K. Saunthwal、Kapil Mohan Saini、Monika Patel、Akhilesh K. Verma
DOI:10.1016/j.tet.2017.03.028
日期:2017.4
Pd-catalyzed preferential CH activation of sterically hindered α, β-olefinic indoles onto alkenes beyond [4 + 2] cycloaddition has been described. The carbazole derivatives were readily synthesized via activation of vinylic CH bonds with excellent regioselectivity. Further, the one-pot strategy has been employed for the synthesis of tricyclic carbazoles. The double and triple CH activation followed by concomitant
Compounds are described that are active on at least one of PPARα, PPARδ, and PPARγ, which are useful for therapeutic and/or prophylactic methods involving modulation of at least one of PPARα, PPARδ, and PPARγ.
Compounds are described that are active on at least one of PPARα, PPARδ, and PPARγ, which are useful for therapeutic and/or prophylactic methods involving modulation of at least one of PPARα, PPARδ, and PPARγ, wherein the compounds have the formula:
wherein:
X2 and X3 are independently CH or N; and
one of X1 and X4 is N or CR4 and the other of X1 and X4 is N or CH.
Phosphoric Acid-Catalyzed Alkene Difunctionalization of 2-Vinylpyridines via HOMO/LUMO Biactivated Diels–Alder Reaction
作者:Shu-Shu Xiong、Cui Jian、Yan-Qing Mo、Wei Hu、Yong-Ke He、Bao-Yi Ren、Yu-Ming Yang、Shaoyu Li
DOI:10.1021/acs.joc.4c00929
日期:2024.7.19
contrast to the well-developed hydrogen functionalization. Current exploration on [4 + 2] cyclization of vinylpyridines mainly relies on extremely high temperatures and the LUMO activation of vinylpyridines using boron trifluoride as a strong Lewis acid. Herein, we established a phosphoricacid-catalyzed [4 + 2] cyclization reaction of 3-vinyl-1H-indoles and 2-vinylpyridines by means of the LUMO/HOMO