Synthesis of the Bicyclic Welwitindolinone Core via an Alkylation/Cyclization Cascade Reaction
摘要:
Synthesis of an advanced welwitindolinone intermediate via an alkylation/cyclization reaction Is reported. The key step involves a one pot Lewis acid-mediated alkylation of a silylketene aminal with a furan alcohol followed by an intramolecular cyclization. The reaction is stereoselective and takes place at low temperature. The cycloadduct was highly functionalized and contains the welwitindolinone core structure.
Organocatalytic condensation–ring opening–annulation cascade reactions between N-Bocindolin-2-ones/benzofuran-2(3H)-ones and salicylaldehydes for synthesis of 3-arylcoumarins
作者:Yuyu Cheng、Pengfei Zhang、Yanwen Jia、Zhiqiang Fang、Pengfei Li
DOI:10.1039/c7ob01730h
日期:——
An organocatalytic cascade synthesis of 3-arylcoumarins has been developed.
The present invention relates to compounds of formula (I):
or pharmaceutically acceptable salts thereof, as well as processes for their manufacture, pharmaceutical compositions comprising them, and their use as medicaments.
The trivalent phosphine-catalyzed [4+1] spiro-annulation reaction of allenyl imide and activated methylene cyclocompounds has been developed for the construction of various spiro-2-cyclopenten-1-ones. Oxindoles, 3-isochromanones, and 2-indanones are selected as 1C synthons to capture the in situ-generated bis-electrophilic α,β-unsaturated ketenyl phosphonium intermediate, affording the corresponding
N-Heterocyclic Carbene-Catalyzed Remote Enantioselective C–C Bond Formation via 1,6-Addition with Formyl Enynes
作者:Xiaolin Peng、Yixian Huang、Wei Wang、Shiguang Li、Ge-fei Hao、Shichao Ren、Yonggui Robin Chi
DOI:10.1021/acscatal.3c04733
日期:2024.2.2
N-Heterocyclic carbenes (NHCs) have emerged as powerful organocatalysts in controlling the stereoselectivities of the reaction sites that are remote from the catalyst-binding position. Meanwhile, the construction of a stereogenic center at the δ-position through NHCcatalysis remains an unmet goal. Herein, we report the NHC-catalyzed enantioselective 1,6-conjugated addition reaction of formyl enynes
N-杂环卡宾(NHC)已成为控制远离催化剂结合位置的反应位点的立体选择性的强大有机催化剂。与此同时,通过 NHC 催化在 δ 位构建立体中心仍然是一个未实现的目标。在此,我们通过氧化 LUMO 激活策略报道了 NHC 催化的甲酰烯炔与亲核试剂的对映选择性 1,6-共轭加成反应。该反应能够在甲酰烯炔底物的δ位上进行有效的手性控制,从而获得高附加值的对映体富集的吡喃并[2,3- b ]吲哚和吡喃并[2,3- c ]吡唑衍生物。此外,通过我们产品的氧化实现了中心到轴的手性转移,从而能够轻松获得轴向手性吡喃。