title: Synthesis and biological activity of novel series of 4-methoxy, and 4,9-dimethoxy-5-substituted furo[2,3-g]-1,2,3-benzoxathiazine-7,7-dioxide derivatives.
abstract: A novel series of 4-methoxy, and 4,9-dimethoxy-5-substituted furo[2,3-g]-1,2,3-benzoxathiazine-7,7-dioxide derivatives 3a,b, 10a-g and 11a-g were prepared in good yields via the reaction of 4-methoxy (1a) and 4,7-dimethoxy-5-acetyl-6-hydroxybenzofurans (1b) and their α,β-unsaturated keto derivatives 6a-g and 7a-g with chlorosulfonyl isocyanate (CSI). On the other hand, N-chlorosulfonyl carbamate derivatives 4a,b, 12a,b and 13a,b were prepared and allowed to react with piperidine to give the corresponding N-piperidinosulfonyl carbamate derivatives 5a,b, 14a,b and 15a,b, respectively. Sixteen new target compounds 3a,b, 10a-g, and 11a-g were tested for their DPPH radical-scavenging, and in vitro antiproliferative activity against A-549, MCF7 and HCT-116 cancer cell lines. Compounds 10a, 11c, 11e, and 11g showed moderate DPPH radical-scavenging activity compared to ascorbic acid at 100 μg/mL. 4,9-Dimethoxy-5-substituted styrylfuro[3,2-g]-1,2,3-benzoxathiazine-7,7-dioxides 11a, 11b, and 11c were found to be highly active against A-549 and HCT-116 cancer cell lines with IC50 values ranging from 0.02 to 0.08 μmol/mL compared to doxorubicin with IC50 = 0.04 and 0.06 μmol/mL, respectively.
authors: Chemistry Department of Natural Compounds, National Research Centre, 12311 Dokki, Giza, Egypt.
authors: Eslam R
authors: ER
authors: El-Sawy
authors: Chemistry Department of Natural Compounds, National Research Centre, 12311 Dokki, Giza, Egypt.
authors: Manal S
authors: MS
authors: Ebaid
authors: Chemistry Department of Natural Compounds, National Research Centre, 12311 Dokki, Giza, Egypt.
authors: Heba M
authors: HM
authors: Abo-Salem
authors: Pharmacognosy Department, National Research Centre, 12311 Dokki, Giza, Egypt.
authors: Salwa
authors: S
authors: El-Hallouty
authors: Therapeutical Chemistry Department, National Research Centre, 12311 Dokki, Giza, Egypt.
authors: Emad M
authors: EM
authors: Kassem
authors: Chemistry Department of Natural Compounds, National Research Centre, 12311 Dokki, Giza, Egypt.
authors: Adel H
authors: AH
authors: Mandour
keywords: Anticancer activity; Benzofuran; Benzoxathiazin-7,7-dioxide; Chlorosulfonyl isocyanate (CSI); DPPH radical-scavenging activity