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A series of steroidal hybrids with different terminal bioactive scaffolds were synthesized using the molecular hybridization approach and further evaluated for their antiproliferative activity against several cancer cell lines of different origins using the MTT assay. The preliminary results indicated that compounds 12a–h with the terminal isatin motif were remarkably sensitive to SH-SY5Y cells, thereby exerting potent growth inhibition in vitro. This selectivity is possibly attributed to LSD1 inactivation (IC 50 = 3.18 μM). Besides, we also found that the chloro atom at the 7-position on the isatin core was beneficial for the activity through the SARs studies. Among this series, compound 12g showed the best inhibitory activity (IC 50 = 4.06 μM) against SH-SY5Y cells, which was comparable to that of 5-FU. Compound 12g arrested cell cycle at G2/M phase, induced apoptosis accompanied with decrease of mitochondrial membrane potential, and inhibited LSD1 potently (IC 50 = 3.18 μM). Docking studies showed that compound 12g formed interactions with surrounding amino acid residues and the steroid nucleus occupied the tubular hydrophobic cavity of the active site. Compounds 13–18 represented weak to moderate activity against the tested cancer cell lines. The steroidal dimer 20 and the structurally simplified non-steroidal dimer 21 were found to be devoid of the inhibitory activity. [ABSTRACT FROM AUTHOR]

A series of new isatin/triazole conjugates were designed based on the hypothesis that the ester-linked compounds could be enzymatically hydrolyzed by cellular esterases inside the cells. These compounds showed moderate to good growth inhibition toward the tested cancer cells, exerted selective inhibition toward MGC-803 cells and were less toxic to normal cells HL-7702 and GES-1. Of these compounds, compound 5a showed the best inhibitory activity against MGC-803 cells (IC 50 = 9.78 μM), induced apoptosis through multiple mechanisms, as well as inhibited migration of MGC-803 cells. [ABSTRACT FROM AUTHOR]

The identification of novel anticancer agents with high efficacy and low toxicity has always been an intriguing topic in medicinal chemistry. The unique structural features of spirooxindoles together with diverse biological activities have made them promising structures in new drug discovery. Among spirooxindoles, CFI-400945 holds its promise as the first potent PLK4 inhibitor, the fumarate of CFI-400945 has entered phase I clinical trials for the treatment of solid tumors. However, questions remain as to whether PLK4 is the only relevant therapeutic target for CFI-400945. To highlight this significant progress of CFI-400945 in last two years, this review centers on the identification from a focused kinase library, structural optimizations and strategies involved, structure-activity relationships, modes of action, target validation, chemical synthesis and, more importantly, the kinase selectivity between PLK4 and other targets. [ABSTRACT FROM AUTHOR]

Highlights: [•] Two series of novel steroidal spiro-oxindoles were efficiently synthesized. [•] Most of these compounds exhibited broad-spectrum antiproliferative activities. [•] Some of them were more potent than 5-Fu against four human cancer cell lines. [•] Compound 3g showed good antiproliferative activity against SMMC-7721 (IC50 =0.71μM). [•] Compound 3n showed cell cycle arrest at G2/M phase and induced early apoptosis. [Copyright &y& Elsevier]

An efficient and practical base-promoted cascade reaction has been developed to access steroidal polysubstituted anilines from simple precursors. The protocol reported herein achieved the formation of a benzene ring as well as three continuous C–C bonds in a single operation. The reaction mechanism was proposed on the basis of the key intermediate obtained. Besides, this method could be potentially employed for the synthesis of biphenyl compounds. The adjacent amine and nitrile groups existed in the final products have the potential for late stage functionalization, which would provide efficient access to steroidal compound collections with structural diversity and complexity. [ABSTRACT FROM AUTHOR]

A series of novel steroidal spirooxindoles 3a – h were synthesized from pregnenolone in a high regioselective manner using the 1,3-dipolar cycloaddition as the key step. This protocol resulted in the formation of two C–C bonds, one C–N bond and the creation of one pyrrolidine ring and three contiguous stereocenters in a single operation. Biological evaluation showed that these synthesized steroidal spirooxindoles exhibited moderate to good antiproliferative activity against the tested cell lines and some of them were more potent than 5-FU. Among them, compounds 3e and 3f displayed the best antiproliferative activity against MCF-7 cells with the IC 50 values of 4.0 and 3.9 μM, respectively. Flow cytometry analysis demonstrated that compound 3d caused the cellular apoptosis and cell cycle arrest at G2/M phase in a concentration-dependent manner. Docking results indicated that compound 3d fitted well into the MDM2 active site 1RV1 by interacting with Lys94 and Thr101 residues. [ABSTRACT FROM AUTHOR]

Highlights: [•] The steroidal dienamides were synthesized stereoselectively through a cascade aldol/cyclization process. [•] These compounds had moderate to excellent cytotoxic activities. [•] Some of these compounds were more potent than 5-fluorouracil. [•] Compound 3c represented excellent inhibition against MCF-7 (IC50 =0.76μM). [ABSTRACT FROM AUTHOR]

Abstract: Two series of steroidal dienamides 4a–q and 5a–f were designed, synthesized and evaluated for cytotoxic activities against five human cancer cell lines (MGC-803, EC109, PC-3, SMMC-7721 and MCF-7). The protocol developed efficiently achieved the construction of carbon–carbon double bond and selective conversion of nitrile group into carboxamide in one-pot procedure. Besides, compounds 4a–q and 5a–f showed moderate to excellent cytotoxic activities with the IC50 values ranging from 0.1 to 40 μM and most of them were more potent than 5-fluorouracil. Particularly, four compounds 4d, 4e, 4q and 5a showed excellent selectivity against MGC-803 with the IC50 values less than 1 μM. Flow cytometry analysis demonstrated that compound 4c caused the cellular early apoptosis and cell cycle arrest in G2/M phase in a concentration-independent manner. [Copyright &y& Elsevier]