Correction to: Synthesis, characterization and in vitro antimicrobial activity of novel fused pyrazolo[3,4-c]pyridazine, pyrazolo[3,4-d]pyrimidine, thieno[3,2-c] pyrazole and pyrazolo[3',4':4,5]thieno[2,3-d]pyrimidine derivatives.

After the publication of this work [1] it was noticed that on page 3 of the article beginning in the paragraph-'Hydrazide 14 is used as a key producer…' the compound-"Not ethyl-N'-5-amino-1,3-diphenyl-1H-thieno[3,2-c]pyrazole-6-carbonylformohydrazonate" should be deleted. Also on page 10 of the PDF beginning in paragraph-'Synthesis of 5-amino-…' the compound-"Not ethyl-N'-5-amino-1,3-diphenyl-1H-thieno[3,2-c]pyrazole-6-carbonylformohydrazonate" should be deleted. We apologise for these errors.

Correction to: Chemistry Central Journal (2017) 11:112 10.1186/s13065-017-0339-4

After the publication of this work [1] it was noticed that on page 3 of the article beginning in the paragraph—‘Hydrazide 14 is used as a key producer…’ the compound—“Not ethyl-N′-5-amino-1,3-diphenyl-1H-thieno[3,2-c]pyrazole-6-carbonylformohydrazonate” should be deleted. Also on page 10 of the PDF beginning in paragraph—‘Synthesis of 5-amino-…’ the compound—“Not ethyl-N′-5-amino-1,3-diphenyl-1H-thieno[3,2-c]pyrazole-6-carbonylformohydrazonate” should be deleted. We apologise for these errors.

The original article was corrected.