Holla, B Shivarama; K, Shridhara; Kalluraya, Balakrishna, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1991, vol. 30, # 7, p. 672 - 675
I<sub>2</sub>-Mediated Oxidative C–N Bond Formation for Metal-Free One-Pot Synthesis of Di-, Tri-, and Tetrasubstituted Pyrazoles from α,β-Unsaturated Aldehydes/Ketones and Hydrazines
An I2-mediated metal-free oxidative C–N bond formation methodology has been established for the regioselective pyrazole synthesis. This practical and eco-friendly one-pot protocol requires no isolation of the less stable intermediates hydrazones and provides a facile access to a variety of di-, tri-, and tetrasubstituted (aryl, alkyl, and/or vinyl) pyrazoles from readily available α,β-unsaturated aldehydes/ketones
I 2介导的无金属氧化C–N键形成方法已建立用于区域选择性吡唑合成。这种实用且环保的一锅操作方案无需分离不稳定程度较高的中间体s,并易于从容易获得的多种二,三和四取代(芳基,烷基和/或乙烯基)吡唑中分离α,β-不饱和醛/酮和肼盐。
Synthesis, characterization and biological activities of some new benzo[b]thiophene derivatives
作者:Arun M. Isloor、Balakrishna Kalluraya、K. Sridhar Pai
DOI:10.1016/j.ejmech.2009.11.015
日期:2010.2
Benzo[b]thiophene molecules are found to be important tools in synthetic medicinal chemistry. They are of current interest due to their wide spectrum of pharmacological properties. In view of the biological activities of benzo[b]thiophene containing molecules, in this present research work, we propose the synthesis of some newbenzo[b]thiophenederivatives such as thiadiazoles, oxadiazoles, pyrazolin
Visible Light-Mediated Coupling of α-Bromochalcones with Alkenes
作者:Suva Paria、Viktor Kais、Oliver Reiser
DOI:10.1002/adsc.201400638
日期:2014.9.15
Photoredox catalyzed intermolecular couplings of α‐bromochalcones to olefins have been developed. Employing 1 mol% of the iridium complex Ir(ppy)3 as photocatalyst, vinyl radicals are generated from α‐bromochalcones as the key intermediate, which efficiently engage in a formal [4+2] cyclization with various alkenes. The resulting 3,4‐dihydronaphthalenes can be readily transformed to the corresponding
已经开发了光氧化还原催化的α-溴代查耳酮与烯烃的分子间偶联。使用1 mol%的铱络合物Ir(ppy)3作为光催化剂,乙烯基自由基是由α-溴代查耳酮作为关键中间体生成的,可以有效地与各种烯烃进行正式的[4 + 2]环化反应。生成的3,4-二氢萘可以很容易地转化为相应的萘,并进一步环化为5 H-苯并[ c ]芴。另外,如果烯烃在烯丙基位置具有合适的离去基团,则可以得到Heck型偶联产物与空间受阻更强的烯烃或烯丙基化产物。
Chiral N,N′-dioxide-Sc(NTf<sub>2</sub>)<sub>3</sub> complex-catalyzed asymmetric bromoamination of chalones with N-bromosuccinimide as both bromine and amide source
A chiral N,N[prime or minute]-dioxide-Sc(NTf2)3complex catalytic system has been developed to catalyze the asymmetric bromoamination reaction of chalones with N-bromosuccinimide.
Copper-Catalyzed Enantioselective 1,4-Protosilylation of Alkynyl-substituted Enones to Synthesize the Highly Diastereomeric Chiral Homoallenylsilanes
作者:Qi Li、Zi-Lu Wang、Huan-Xuan Lu、Yun-He Xu
DOI:10.1021/acs.orglett.2c00739
日期:2022.4.22
A copper-catalyzed 1,4-protosilylation of α-alkynyl-enones to form the functionalized chiral homoallenylsilanes was developed. In the presence of a chiral monopyridine oxazoline ligand, a variety of trisubstituted allene derivatives bearing a contiguous stereogenic center and axis were prepared in good yields with excellent enantioselectivities and diastereoselectivities.