Pharmaceutical compositions and method of producing anti-psychotic
申请人:SmithKline Corporation
公开号:US04086350A1
公开(公告)日:1978-04-25
Tricyclic piperidylidene derivatives administered internally to an animal host, in therapeutically effective amounts, produce antipsychotic activity without extrapyramidal symptoms. Certain of the active ingredients are novel compounds per se.
Monopropargylated xanthydrol silyl ethers were isolated as reaction intermediates and these species could be transformed into symmetrical and non-symmetrical bispropargylated xanthenes. The formation of non-symmetrical bispropargylated xanthenes could also be achieved through an one-pot procedure. Finally, other interesting structures, such as propargylxanthylidenes, propargylxanthenes and bispropargylated xanthenes
Direct Excitation of Aldehyde to Activate the C(
<i>sp</i>
<sup>
<i>2</i>
</sup>
)−H Bond by Cobaloxime Catalysis toward Fluorenones Synthesis with Hydrogen Evolution
highly reactive photoexcited triplet state of aromatic aldehyde intermediates is intercepted by the catalyst in the ground state, thus leading to the synthesis of a series of fluorenones, xanthones and thioxanthones in good to excellent yields without any external oxidants and with hydrogen as the byproduct.
已经成功开发了通过钴肟催化直接激发醛以激活其 C ( sp 2 )-H 键。在照射下,芳香醛中间体的高反应性光激发三重态被基态催化剂拦截,从而导致在没有任何外部氧化剂和氢作为副产品。
Photoredox Catalysis with Visible Light for Synthesis of Thioxanthones Derivatives
作者:Wen Liao、Jing Hou、Hongding Tang、Xinyue Guo、Guanyu Sheng、Ming Jin
DOI:10.1021/acs.orglett.3c02253
日期:2023.9.1
A visible-light-promoted and transition-metal-free photoredox-catalysis strategy is developed for the synthesis of thioxanthone derivatives (TXs). The mechanistic study and density functional theory calculations suggest that visible-light-promoted intramolecular cyclization can be divided into hydrogen atom transfer, C–C formation, and oxidative dehydrogenation with high regioselectivity and reactivity