P. Krishnaiah

A new BIS-Andrographolide Ether from Andrographis paniculata Nees and evaluation of anti-HIV activity

Novel bis-andrographolide ether (1) and six known compounds andrographolide, 14-deoxy-11,12-didehydroandrographolide, andrograpanin, 14-deoxyandrographolide, (±)-5-hydroxy-7,8-dimethoxyflavanone, and 5-hydroxy-7,8-dimethoxyflavone have been isolated from the aerial parts of Andrographis paniculata and their structures were established by spectral data. All the isolates were tested for the anti-HIV and cytotoxic activity.

Bismuth triflate catalyzed conjugate addition of indoles to α,β-enones

Reaction of indoles with electron deficient olefins under the influence of bismuth triflate has been studied at ambient temperature and affords the corresponding 3-alkylated indoles in excellent yields.

Zirconium (IV) chloride catalyzed ring opening of epoxides with aromatic amines

Abstract Zirconium (IV) chloride catalyzed ring opening of epoxides with anilines to afford the corresponding β‐amino alcohols in acetonitrile at ambient temperature was discussed.

CAN Catalyzed One‐Pot Synthesis of α‐Amino Phosphonates from Carbonyl Compounds

Abstract α‐Amino phosphonates are synthesized by three component condensation of aldehydes, amines, and diethyl phosphite using ceric ammonium nitrate at room temperature to afford the corresponding α‐amino phosphonates in high yields. #IICT Communication No. 020214. ‡Dedicated to Professor Goverdhan Mehta on his 60th Birthday.

A Novel Stereoselective Total Synthesis of (+)‐5‐epi‐Cytoxazone

Abstract Stereoselective synthesis of a potent cytokine modulator cytoxazone isomer has been achieved from 2,3‐O‐isopropylidene D‐glyceraldehyde involving Grignard reaction, subsequent formation of an azide followed by reduction to the aminodiol, and finally cyclization of the N‐Boc diol. #IICT Communication no. 021009.

Chemical transformation of ∆9(15)-africanene and their antibacterial activity

Abstract∆9(15) Africanene, a medicinally important natural sesquiterpenoid has been subjected to chemical transformations to prepare aromatic, hetero aromatic, and aliphatic esters. The synthesized compounds were characterized using IR, mass, and NMR spectrometric analysis. The compounds were evaluated for their antibacterial activities.Graphical Abstract