Results 91 to 100 of about 1,879 (233)

1,3-Dipolar cycloaddition approach to novel dispiro[pyrazolidine-4,3′-pyrrolizidine-2′,3″-indoline]-2″,3,5-triones

, 2017
A simple and convenient 1,3-dipolar cycloaddition of non-stabilised azomethine ylides derived from isatins and L-proline, in a variety of different solvents, to ( Z)-4-arylidene-1-phenylpyrazolidine-3,5-diones as dipolarophiles afforded a series of ...
Essam M. Hussein, Khalid S. Khairou, Nizar El Guesmi, Saleh A. Ahmed   +3 more
core   +1 more source

Dispiro-​oxepine​/thiapine derivatives for optoelectronic semiconductors

The dispiro-oxepine/dispiro-thiapine derivatives for optoelectronic semiconductors is a compound based on a structure having a functionalized dispiro compound of formula (Ia) or (Ib) with the core unit being a seven-membered heterocycle oxepine or ...
Paek, Sanghyun, Nazeeruddin, Mohammad Khaja, Sohail, Muhammad, Damen, Klaus H., Rakstys, Kasparas   +4 more
core  

Dispiro-1,2,4-trioxane Analogues of a Prototype Dispiro-1,2,4-trioxolane:  Mechanistic Comparators for Artemisinin in the Context of Reaction Pathways with Iron(II)

, 2016
Single electron reduction of the 1,2,4-trioxane heterocycle of artemisinin (1) forms primary and secondary carbon-centered radicals. The complex structure of 1 does not lend itself to a satisfactory dissection of the electronic and steric effects that ...
Xiaofang Wang (163746), Yuxiang Dong (1377870), James K. Wood (2739484), Kamaraj Sriraghavan (2296156), Jonathan L. Vennerstrom (503780), Yuanqing Tang (2325898)   +5 more
core   +1 more source

Synthesis of penta- and tetra-cyclic cage-like compounds and dispiro heterocycles through microwave-assisted solvent-free multi-component domino reactions

, 2017
Novel penta- and tetra-cyclic cage-like compounds and dispiro heterocycles were obtained as a result of a microwave-assisted three-component domino reaction.
Abdulrahman I. Almansour, Seeni Maharani, Anitha Kandasamy, Raju Ranjith Kumar, Sundaravel Vivek Kumar, Raju Suresh Kumar   +5 more
core   +1 more source

CyclopropyI building blocks for organic synthesis, 60 Synthesis and properties of optically active dispiro[2.0.2.1]heptane derivatives as novel ferroelectric liquid crystalline compounds

, 2000
Enantioselective enzymatic acylation, using Lipase PS(R) (Pseudomonas sp., immobilized on Celite, Amano Pharmaceutical Co., Ltd.), of endo-dihalosubstituted and nonsubstituted dispiro[2.0.2.1]heptylmethanol and endo-4-methylene-spiropentylmethanol ...
Miyazawa, K., Yufit, Dmitry S., de Meijere, Armin, Howard, JAK   +3 more
core   +1 more source

Effective and diastereoselective preparation of dispiro[cyclopent-3′-ene]bisoxindoles via novel [3 + 2] annulation of isoindigos and MBH carbonates

, 2018
Efficient, one-step preparation of highly steric dispiro[cyclopent-3′-ene]bisoxindoles with two all-carbon quaternary spirocenters and three adjacent cycles in excellent yields and diastereoselectivities under mild conditions.
Li-Guo Liao, Li-Xin Wang, Lin Peng, Hong-Xia Ren, Fang Tian, Xiang-Jia Song, Ying Zou   +6 more
core   +1 more source

Methyl-Substituted Dispiro-1,2,4,5-tetraoxanes:  Correlations of Structural Studies with Antimalarial Activity

, 2016
Two tetramethyl-substituted dispiro-1,2,4,5-tetraoxanes (7,8,15,16-tetraoxadispiro[5.2.5.2]hexadecanes) 3 and 4 were designed as metabolically stable analogues of the dimethyl-substituted dispiro-1,2,4,5-tetraoxane prototype WR 148999 (2). For a positive
Yuxiang Dong (1377870), James K. Wood (2739484), Kevin J. McCullough (2462725), Dennis E. Kyle (341177), Wilbur K. Milhous (41809), Apurba K. Bhattacharjee (2324788), Jonathan L. Vennerstrom (503780)   +6 more
core   +1 more source

Azomethine Ylides-Versatile Synthons for Pyrrolidinyl-Heterocyclic Compounds. [PDF]

Molecules, 2023
Panda SS, Aziz MN, Stawinski J, Girgis AS.   +3 more
europepmc   +1 more source

Preliminary communication PRELIMINARY COMMUNICATION

, 2004
: Several C2 symmetrical mixed tetraoxanes were prepared starting from a gemdihydroperoxide and a ketone. The obtained tetraoxanes showed pronounced antimalarial activity against P.
Igor Opsenica, Dejan Opsenica, Tetraoxa-dispiro�. �hexadecane--carboxylic Acid, Wilbur K. Milhous   +3 more
core  

Cyclodimerization of 3-phenacylideneoxindolines with amino esters for the synthesis of dispiro[indoline-3,1′-cyclopentane-3′,3″-indolines]

, 2017
Triethylamine-promoted domino cyclodimerization reaction of 3-phenacylideneoxindolines with amino ester hydrochlorides in acetonitrile afforded substituted dispiro[indoline-3,1′-cyclopentane-3′,3″-indolines] in good yields.
Jing Sun, Chao-Guo Yan, Ren-Yin Yang, Ju Xie   +3 more
core   +1 more source