Synthesis, analytical behaviour and biological evaluation of new 4-substituted pyrrolo[1,2-a]quinoxalines as antileishmanial agents
摘要:
An original series of 4-substituted pyrrolo[1,2-a]quinoxaline derivatives, new structural analogues of Galipea species quinoline alkaloids, was synthesized from various substituted 2-nitroanilines via multistep heterocyclizations and tested for in vitro antiparasitic activity upon Leishmania amazonensis and Leishmania infantum strains. Structure-activity relationships enlighten the importance of the 4-substituted alkenyl side chain on the pyrrolo[1,2-a]quinoxaline moiety to modulate the antileishmanial activity. (c) 2006 Elsevier Ltd. All rights reserved.
dehydrogenative rearomatization of hydrogenation product and poisoning effect of nitrogen atom, asymmetric hydrogenation of polycyclic nitrogen‐containing heteroaromatics is still a great challenge. Herein, through in situ protection of hydrogenation products with acetic anhydride to inhibit rearomatization and poisoning effect, a novel iridium‐catalyzed enantioselectivehydrogenation of polycyclic nitrogen‐containing
由于氢化产物的脱氢重新芳构化和氮原子的中毒作用,多环含氮杂芳族化合物的不对称氢化仍然是一个巨大的挑战。这里,通过在原位用乙酸酐来抑制rearomatization和中毒效果,多环含氮杂的新型铱-催化的对映选择性氢化的氢化产物保护-吡咯并/吲哚并[1,2一]喹喔啉和菲啶-已经成功可以轻松获得高达98%ee的手性二氢吡咯并/吲哚并[1,2- a ]喹喔啉和二氢菲啶。该策略具有广泛的底物范围,易于操作和潜在的医学应用。