Catalytic Ynone–Amidine Formal [4 + 2]-Cycloaddition for the Regioselective Synthesis of Tricyclic Azepines
作者:T. Prabhakar Reddy、Jagjeet Gujral、Pritam Roy、Dhevalapally B. Ramachary
DOI:10.1021/acs.orglett.0c03711
日期:2020.12.18
A Ca(OTf)2- and self-promoted ynone–amidine atom-economic formal [4 + 2]-cycloaddition of various ynones with amidines is reported for the construction of highly functionalized tricyclic azepines. High reaction rate, ease of operation, and high product selectivity with wide substrate scope are the key advantages of the present annulation protocol.
Trichloromethylative olefin lactonization was reported. A photoredox iridium catalyst irradiated with blue LEDs promoted the reaction without using hazardous reagents. The mechanistic studies were performed by experimental and theoretical means. The trichloromethyl moiety of the product could be converted to the corresponding dichloroalkene and chloroalkyne in addition to the carboxyl group.
报道了三氯甲基化烯烃内酯化。用蓝色 LED 照射的光氧化还原铱催化剂在不使用危险试剂的情况下促进了反应。通过实验和理论手段进行了机理研究。除羧基外,产物的三氯甲基部分还可转化为相应的二氯烯烃和氯炔。
Asymmetric Transfer Hydrogenation of Functionalized Acetylenic Ketones
作者:Zhijia Fang、Martin Wills
DOI:10.1021/jo401284c
日期:2013.9.6
A systematic study of the asymmetric transfer hydrogenations of functionalized acetylenic ketones and diketones has been completed, together with a total synthesis of (S,S)-(-)-yashabushidiol B. In several cases, excellent enantioselectivities and yields were achieved.
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