Photocatalytic Giese Addition of 1,4-Dihydroquinoxalin-2-ones to Electron-Poor Alkenes Using Visible Light
作者:Jaume Rostoll-Berenguer、Gonzalo Blay、José R. Pedro、Carlos Vila
DOI:10.1021/acs.orglett.0c02953
日期:2020.10.16
The optimized reaction conditions provide a good yield for the radical conjugate addition products (44 examples) with a wide range of structurally different Michael acceptors. A gram scale reaction using sunlight irradiation is also described. Furthermore, several transformations were carried out with the Giese addition products.
使用Ru(bpy)3 Cl 2作为光催化剂和(PhO)2 PO 2 H作为添加剂,实现了1,4-二氢喹喔啉-2-酮与Michael受体的可见光光氧化还原催化偶联。优化的反应条件为具有广泛结构上不同的迈克尔受体的自由基共轭加成产物(44个实例)提供了良好的收率。还描述了使用阳光照射的克级反应。此外,使用Giese添加产品进行了几次转化。
Diels-alder reactions of pyrano[3,4-b]indol-3-ones with substituted alkenes : synthesis of 1,2-dihydrocarbazoles - part II
作者:P. Van Doren、F. Compernolle、G. Hoornaert
DOI:10.1016/s0040-4020(01)90537-x
日期:1990.1
The Diels-Alder reaction of pyrano[3,4-b]indol-3-ones 1 with trisubstituted dienophiles 2 yields stable 1,2-dihydrocarbazoles 4. Electronic and steric factors, together with a gradual change in mechanism from a concerted to a more stepwise reaction, are invoked to explain the regiochemical distribution of products.
Reaction of Corey Ylide with α,β-Unsaturated Ketones: Tuning of Chemoselectivity toward Dihydrofuran Synthesis
作者:Alexey O. Chagarovsky、Ekaterina M. Budynina、Olga A. Ivanova、Elena V. Villemson、Victor B. Rybakov、Igor V. Trushkov、Mikhail Ya. Melnikov
DOI:10.1021/ol500877c
日期:2014.6.6
A straightforward, efficient, and reliable approach to synthetically valuable 2,3-dihydrofurans via a reaction between Corey ylide and α,β-unsaturated ketones has been developed. The use of simple and widely spread starting materials as well as mild reaction conditions and scalability provide a broad scope of 2,3-dihydrofurans.
Efficient promiscuous Knoevenagel condensation catalyzed by papain confined in Cu<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub> nanoflowers
作者:Jianyun Yu、Xinxin Chen、Min Jiang、Anming Wang、Linlin Yang、Xiaolin Pei、Pengfei Zhang、Stephen Gang Wu
DOI:10.1039/c7ra12940h
日期:——
have been investigated for Knoevenagelcondensation reactions with hNFs as catalyst. At optimal conditions, product yield of the hNFs catalyzed reaction was 1.3 fold higher than that of the free enzyme with benzaldehyde and acetylacetone as substrates. A few aldehydes and methylene compounds have also been used to test the generality and scope of this new enzymatic promiscuity. To sum up, the obtained
The invention relates to a method of preparation of fluoroquinolones of formula (I) from compounds of formula (II):
in which R
1
, R
2
, R
3
, R
4
, R
5
, R
6
, R
7
, and X are as defined in Claim
1.