作者:Alan R. Katritzky、Qiu-He Long、Ping Lue、Andrzej Jozwiak
DOI:10.1016/s0040-4020(01)81471-x
日期:——
A new, facile preparation of enamines was achieved via a two-step sequence: (i) the ready formation of an N-(α-aminoalkyl)benzotriazole derivative from equimolar amounts of benzotriazole, an aldehyde, and a secondary amine, (ii) the elimination of benzotriazole from the derivative by sodium hydride in tetrahydrofuran (THF). The method provides enamines in good overall yields based on the quantity of
Iron-Catalyzed Tunable and Site-Selective Olefin Transposition
作者:Xiaolong Yu、Haonan Zhao、Ping Li、Ming Joo Koh
DOI:10.1021/jacs.0c08631
日期:2020.10.21
earth-abundant iron-based complex, a base and a boryl compound promote efficient and controllable alkene transposition. Mechanistic investigations reveal that these processes likely involve in situ formation of an iron-hydride species which promotes olefin isomerization through sequential olefin insertion/β-hydride elimination. Through this strategy, regiodivergent access to different products from
CC 双键的催化异构化是必不可少的化学转化,用于提供更高价值的类似物,在化学工业中具有重要用途。尽管在该领域取得了进展,但仍然迫切需要一种通用催化解决方案,能够精确控制环状和非环状体系中的 C=C 键迁移位置,以提供二取代和三取代烯烃。在这里,我们展示了催化量的合适的地球丰富的铁基络合物、碱和硼基化合物促进有效和可控的烯烃转位。机理研究表明,这些过程可能涉及原位形成铁氢化物物种,该物种通过顺序烯烃插入/β-氢化物消除促进烯烃异构化。通过这个策略,
Highly efficient synthesis of aldenamines from carboxamides by iridium-catalyzed silane-reduction/dehydration under mild conditions
The combination of IrCl(CO)(PPh3)2 with 1,1,3,3-tetramethyldisiloxane or poly(methylhydrosiloxane) (PMHS) is found to be an efficient catalyst system for the preparation of aldenamines from carboxamides; in particular, facile removal of silicone and iridium residues from the product can be achieved by the use of PMHS.
Boranes in Synthesis. 1. Asymmetric synthesis of β-amino alcohols. A facile conversion of enamines to the corresponding β-amino alcohols in high enantiomeric purity
作者:Gary B. Fisher、Christian T. Goralski、Lawrence W. Nicholson、Bakthan Singaram
DOI:10.1016/s0040-4039(00)61541-1
日期:1993.11
The asymmetric hydroboration of aldehyde enamines with dIpc2BH at 0 °C, followed by oxidation with NaOH(s)/H2O2, yields the corresponding β-amino alcohols in good yields and high enantiomeric excess.
醛烯胺与d Ipc 2 BH在0°C下不对称氢硼化,然后用NaOH / H 2 O 2氧化,得到相应的β-氨基醇,收率高,对映体过量高。
Highly Selective Synthesis of Enamines from Olefins