Cross-linked sulfonated polyacrylamide (Cross-PAA-SO3H) attached to nano-Fe3O4 as an efficientheterogeneous solid acid catalyst has been used for the preparation of spiro[pyrazoloquinoline-oxindoles]and spiro[chromenopyrazolo-oxindoles] through a four-component reactions of phenylhydrazineor hydrazine hydrate, isatins, ketoesters and naphthylamine or 2-naphthol under reflux co...

The reactivity of quinoneimines towards ketene and diphenylketene was examined. N-Phenylbenzoquinoneirnines (I), (2) and also N-phenylnaphthoquinoneimine react with ketene to give the spiro-adducts (5), (7) and (1 1) respectively. These adducts were stable even after prolonged heating in high boiling solvent. Reaction of the above imines with diphenylketene also afforded 13- lactam spiro-a...

Cyril Poriel introduces the Journal of Materials Chemistry C Editor's choice web collection on advances in ‘Spiro compounds for electronics’.

ABSTRACT. One-pot, mild and efficient synthesis of various spiro-nitrogen heterocycle compounds, based on the reaction ninhydrin 1,2-diamino-benzene, (indenoquinoxalin), with N-heterocycle compounds dialkylacetylenedicarboxylates is described. Using this approach, at a temperature 50-60 °C in acetonitrile solvent, can be obtained very high yields.
 
 KEY WORDS: Ninhydrin, 1,2-Diaminob...

It is my sad editorial duty to acknowledge that Professor David Hadden, previous editor of this Journal died earlier this year. As a previous editor he has his obituary published here and I thank Professor Patrick Bell for rising to this sad task so diligently. David bore his final illness with great dignity, clearly determined that while he was alive, he would live (dum vivimus, vivamus). The ...

3D-pharmacophore and 2D-QSAR modeling studies describe the anti-oncological properties of spiro-alkaloids. The dispiro[2H-indene-2,3'-pyrrolidine-2',3''-[3H]indole]-1,2''(1''H, 3H)-diones 20-38 were prepared via 1,3-dipolar cycloaddition reactions of azomethine ylides (generated in situ via decarboxylative condensation of isatins 7-9 with sarcosine 10) and 2-(arylmethylidene)-2,3-dihydro-1H-ind...

The title compound {systematic name: spiro-[cyclo-pentane-1,2'(1'H)-quinazolin]-4'(3'H)-one]}, C(12)H(14)N(2)O, has been reported previously [Klemm, Weakley, Gilbertson & Song (1998 ▶). J. Heterocycl Chem. 35, 1269-1273]. Its structure has been redetermined at 113 K with greater precision for all data. The mol-ecule is built up from two fused six-membered rings and one five-membered ring linked...

Increasing interests have been invested in the development of synthetic strategies toward the construction of spiro[pyrrolidine-2,3'-oxindole], which is the core structural skeleton in some compounds with diverse biological activities. In this work, an efficient diastereoselective 1,3-dipolar cycloaddition reaction of azomethine ylides generated in situ from 3-amino oxindoles and aldehydes with...

Only a limited number of spiro compounds has been reported in which both components have a phosphazene or phosphazenelike skeleton. The first member of this class, viz. NP[(NPCl2)2NCH3](NPCl2)2 (Fig. l.A), was prepared by Lehr [2] by means of a Kirsanov conversion of (NPC12)2NP(NH2)2 into (NPC12)2NP(NPC13)2, followed by a ring closure reaction using [(CH3)3Si]2NCH3. Two other routes have been d...