Journal of Catalysts / 2013 / Article / Tab 2

Research Article

Microwave-Assisted Synthesis of Spirofused Heterocycles Using Decatungstodivanadogermanic Heteropoly Acid as a Novel and Reusable Heterogeneous Catalyst under Solvent-Free Conditions

Table 2

H6GeW10V2O40·22H2O catalyzed synthesis of spiroheterobicyclic rings 1(a-l).

EntryX–Z–XGProductYield (%)M.P. (°C)

1O–C(Me)2–OH1a80223–225
2O–C(Me)2–OMe1b68199-200
3O–C(Me)2–OCl1c66204–206
4O–C(Me)2–OF1d67216–218
5HN–CO–NHH1e87240–242
6HN–CO–NHMe1f84246–248
7HN–CO–NHCl1g82291–293
8HN–CO–NHF1h77213–215
9MeN–CO–NMeH1i83232–234
10MeN–CO–NMeMe1j85228–230
11MeN–CO–NMeCl1k77271–273
12MeN–CO–NMeF1l75244–246