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Dirgha Raj Joshi
PhD Candidate
Medicinal Chemistry lab,
College of Pharmacy, Yonsei University
Email: djmeropaila121@yonsei.ac.kr
Supervisor: Prof. Ikyon Kim
Expansion of Indolizine Chemical Space:
Synthesis of Poly-Functionalized Indolizines
Some Biologically Active Quinone-Indolizines
J. Org. Chem. 2020, 85, 10994–11005.
Access to Quinone−Indolizine Hybrids
Synthesis 2010, 23, 4007−4014.
J. Org. Chem. 2014, 79, 3992-3998
Formation of pyrrole ring (previous works)
• quinone-indolizine adducts via [4+2] annulative approach
Formation of pyridine ring (this work)
entry base (equiv) Solvent time (h) Temp. (°C) yield (%)b
1 TEA (1) EtOH 12 rt 82
2 DEA (1) EtOH 12 rt 78
3 DBU (1) EtOH 12 rt 73
4 DIPEA (1) EtOH 12 rt 60
5 DABCO (1) EtOH 12 rt 50
6 - EtOH 12 60 -
7 NaHCO3 (2) EtOH 7 50 -
8 Na2CO3 (1) EtOH 12 50 70
9 TEA (1) DMSO 3 rt 79
10 TEA (1) DMF 4 rt 76
11 TEA (2) CH3CN 4 rt 68
Reaction optimization
Crystal Structure of 4s
Reaction Scope
Further Application
Anticancer activity against PC-3 and CAL-27 cells
compound PC-3 CAL-27
4p 0.024 ± 0.008 0.028 ± 0.007
mitoxantrone 1.10 ± 0.14 1.32 ± 0.18
doxorubicin 0.18 ± 0.04 0.21 ± 0.06
J. Org. Chem. 2020, 85, 10994–11005.
• almost all the compounds potently reduced cell viability (IC50 < 2 μM)
• 4p showed ∼48 times stronger inhibitory effect on cell viability than mitoxantrone
Further Expansion of Indolizine Chemical Spaces
• Michael-Aldol-Double Elimination Cascade to Make Pyridines
• Use of Chromone for the Synthesis of Indolizines
Conclusion
Acknowledgement
• Prof. Ikyon Kim: Current Supervisor
• Prof. Hak Sung Kim: MS Pharmacy Supervisor
• Yonsei University for providing Global Leader Scholarship
• Lab members:
Dr. Anuradha Dagar
Sunhee Lee
Sunmi Kim
Seonghyeon Nam

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PSK-Expansion of Indolizine Chemical Space-Dirgha.pptx

  • 1. Dirgha Raj Joshi PhD Candidate Medicinal Chemistry lab, College of Pharmacy, Yonsei University Email: djmeropaila121@yonsei.ac.kr Supervisor: Prof. Ikyon Kim Expansion of Indolizine Chemical Space: Synthesis of Poly-Functionalized Indolizines
  • 2. Some Biologically Active Quinone-Indolizines J. Org. Chem. 2020, 85, 10994–11005.
  • 3. Access to Quinone−Indolizine Hybrids Synthesis 2010, 23, 4007−4014. J. Org. Chem. 2014, 79, 3992-3998 Formation of pyrrole ring (previous works) • quinone-indolizine adducts via [4+2] annulative approach Formation of pyridine ring (this work)
  • 4. entry base (equiv) Solvent time (h) Temp. (°C) yield (%)b 1 TEA (1) EtOH 12 rt 82 2 DEA (1) EtOH 12 rt 78 3 DBU (1) EtOH 12 rt 73 4 DIPEA (1) EtOH 12 rt 60 5 DABCO (1) EtOH 12 rt 50 6 - EtOH 12 60 - 7 NaHCO3 (2) EtOH 7 50 - 8 Na2CO3 (1) EtOH 12 50 70 9 TEA (1) DMSO 3 rt 79 10 TEA (1) DMF 4 rt 76 11 TEA (2) CH3CN 4 rt 68 Reaction optimization
  • 5. Crystal Structure of 4s Reaction Scope
  • 7. Anticancer activity against PC-3 and CAL-27 cells compound PC-3 CAL-27 4p 0.024 ± 0.008 0.028 ± 0.007 mitoxantrone 1.10 ± 0.14 1.32 ± 0.18 doxorubicin 0.18 ± 0.04 0.21 ± 0.06 J. Org. Chem. 2020, 85, 10994–11005. • almost all the compounds potently reduced cell viability (IC50 < 2 μM) • 4p showed ∼48 times stronger inhibitory effect on cell viability than mitoxantrone
  • 8. Further Expansion of Indolizine Chemical Spaces • Michael-Aldol-Double Elimination Cascade to Make Pyridines • Use of Chromone for the Synthesis of Indolizines
  • 10. Acknowledgement • Prof. Ikyon Kim: Current Supervisor • Prof. Hak Sung Kim: MS Pharmacy Supervisor • Yonsei University for providing Global Leader Scholarship • Lab members: Dr. Anuradha Dagar Sunhee Lee Sunmi Kim Seonghyeon Nam