Total Synthesis of Thiaplakortone A: Derivatives as Metabolically Stable Leads for the Treatment of Malaria
摘要:
Thiaplakortone A (3a), an antimalarial natural product, was prepared by an operationally simple and scalable synthesis. In our efforts to deliver a lead compound with improved potency, metabolic stability, and selectivity, the synthesis was diverted to access a series of analogues. Compounds, 3a-d showed nanomolar activity against the chloroquine-sensitive (3D7) Plasmodium falciparum line and were more active against the chloroquine- and mefloquine-resistant (Dd2) P. falciparum line. All compounds are "Rule-of-5" compliant, and we show that metabolic stability can be enhanced via modification at either the primary or pyrrole nitrogen. These promising results lay the foundation for the development of this structurally unprecedented natural product.
Total Synthesis of Thiaplakortone A: Derivatives as Metabolically Stable Leads for the Treatment of Malaria
摘要:
Thiaplakortone A (3a), an antimalarial natural product, was prepared by an operationally simple and scalable synthesis. In our efforts to deliver a lead compound with improved potency, metabolic stability, and selectivity, the synthesis was diverted to access a series of analogues. Compounds, 3a-d showed nanomolar activity against the chloroquine-sensitive (3D7) Plasmodium falciparum line and were more active against the chloroquine- and mefloquine-resistant (Dd2) P. falciparum line. All compounds are "Rule-of-5" compliant, and we show that metabolic stability can be enhanced via modification at either the primary or pyrrole nitrogen. These promising results lay the foundation for the development of this structurally unprecedented natural product.
Synthesis of polycyclic scaffolds via a gold-catalysed dearomative cyclisation cascade
作者:Aimee K. Clarke、James A. Rossi-Ashton、Richard J.K. Taylor、William P. Unsworth
DOI:10.1016/j.tet.2020.131392
日期:2020.8
Polycyclic scaffolds found in akuammiline alkaloid natural products can be synthesised from ynone-tethered indoles, via a gold(I)-catalysed dearomative cyclisation cascade sequence. The ynone starting materials are themselves made via a two-step modular synthesis from simple tryptamine and tryptophol derivatives.
Modular Synthesis of Polycyclic Alkaloid Scaffolds via an Enantioselective Dearomative Cascade
作者:James A. Rossi-Ashton、Aimee K. Clarke、Richard J. K. Taylor、William P. Unsworth
DOI:10.1021/acs.orglett.0c00053
日期:2020.2.7
akuammiline alkaloids can be synthesized from simple tryptamine and tryptophol derivativesvia a Ag(I)-catalyzed enantioselective dearomative cyclization cascade sequence. The complex tetracyclic scaffolds are prepared via a rapid, versatile, three-step modular synthesis from simple commercially available indole derivatives in high yields and enantiomeric excess (up to 99% yield and >99% ee).