DMAP catalyzed synthesis of some new pyrrolo[3,2-e][1,2,4]triazolo[1,5-c]pyrimidines

Phosphomolybdic acid supported on Schiff base functionalized graphene oxide nanosheets: Preparation, characterization, and first catalytic application in the multi‐component synthesis of tetrahydrobenzo[a]xanthene‐11‐ones

“…Taking all these facts into consideration, and in line with our interest in catalysis, [50][51][52][53][54][55][56][57] in this paper, for the first time, a new SB functionalized GO containing a phosphomolybdic counter-anion H 2 PMo 12 O 40¯( H 2 PMo) was prepared by grafting of APTS on GO nanosheets followed by condensation with benzil and finally reaction with phosphomolybdic acid (H 3 PMo 12 O 40 , denoted as H 3 PMo) and fully characterized (Scheme 1). The catalytic activity of this new material which was denoted as GO-SB-H 2 PMo was also investigated in one-pot synthesis of tetrahydrobenzo[a]xanthene-11-ones by reaction of βnaphthol, aldehydes, and dimedone (Scheme 2).…”

Phosphotungstic acid supported on functionalized graphene oxide nanosheets (GO-SiC3-NH3-H2PW): Preparation, characterization, and first catalytic application in the synthesis of amidoalkyl naphthols

“…Based on these precedents and in line with our interest in catalysis [47][48][49][50][51][52][53][54][55], herein, we report the preparation of a new functionalized GO containing a phosphotungstic counter-anion H2PW12O40¯ (H2PW) by grafting of APTS on GO nanosheets followed by a reaction with phosphotungstic acid (H3PW12O40, denoted as H3PW) which was fully characterized (Scheme 1). The catalytic activity of this new material which was denoted as GO-SiC3-NH3-H2PW was then investigated in one-pot synthesis of amidoalkyl naphthols by reaction of β-naphthol, aromatic aldehydes, and acetamide (Scheme 2).…”

Synthesis of New Imino Containing Tetrahydrochromeno[2,3‐d]pyrimidines

“…These findings encouraged us to synthesize some new 4-imino tetrahydrochromeno[2,3-d]pyrimidine derivatives. Therefore, in continuation of our previous works in the synthesis of new heterocyclic compounds with potential biological activities [37][38][39][40][41][42][43][44][45][46][47][48], in this paper, we report a convenient synthesis of new 3,5-diaryl-4-imino-5,7,8,9tetrahydro-3H-chromeno[2,3-d]pyrimidines 5a-i through a condensation reaction of 2-amino-4-aryl-3-cyano-5,6,7,8tetrahydrobenzo[b]pyrans 1a-d with triethyl orthoformate 2 in boiling acetic anhydride obtaining compounds 3a-d followed by cyclization with primary aryl amines 4a-d in the presence of a catalytic amount of triethylamine in refluxing ethanol (Scheme 1).…”