Органическая химияТеория
The indolizidine skeleton is a privileged structural motif found in a wide array of biologically active alkaloids. Traditional synthetic routes often rely on chiral pool starting materials or resolution of racemates, which limits structural diversity and scalability. Recent advances in transition-metal catalysis have opened new avenues for constructing these frameworks through direct functionalization of unactivated C–H bonds.
Initial screening revealed that standard phosphine ligands resulted in low conversion (15%) and significant decomposition of the starting material. However, the use of mono-N-protected amino acid (MPAA) ligands dramatically improved both yield and enantioselectivity. Table 1 summarizes the optimization process. Traditional synthetic routes often rely on chiral pool starting materials or resolution of racemates, which limits structural diversity and scalability. Recent advances in transition-metal catalysis have opened new avenues for constructing these frameworks through direct functionalization of unactivated C–H bonds. Table 1 summarizes the optimization process. Traditional synthetic routes often rely on chiral pool starting materials or resolution of racemates, which limits structural diversity and scalability. Recent advances in transition-metal catalysis have opened new avenues for constructing these frameworks through direct functionalization of unactivated C–H bonds.
Electrophilic Addition
Initial screening revealed that standard phosphine ligands resulted in low conversion (15%) and significant decomposition of the starting material. However, the use of mono-N-protected amino acid (MPAA) ligands dramatically improved both yield and enantioselectivity. Table 1 summarizes the optimization process. Traditional synthetic routes often rely on chiral pool starting materials or resolution of racemates, which limits structural diversity and scalability. Recent advances in transition-metal catalysis have opened new avenues for constructing these frameworks through direct functionalization of unactivated C–H bonds. Table 1 summarizes the optimization process. Traditional synthetic routes often rely on chiral pool starting materials or resolution of racemates, which limits structural diversity and scalability. Recent advances in transition-metal catalysis have opened new avenues for constructing these frameworks through direct functionalization of unactivated C–H bonds.
Nucleophilic substitution
Traditional synthetic routes often rely on chiral pool starting materials or resolution of racemates, which limits structural diversity and scalability. Recent advances in transition-metal catalysis have opened new avenues for constructing these frameworks through direct functionalization of unactivated C–H bonds.
Initial screening revealed that standard phosphine ligands resulted in low conversion (15%) and significant decomposition of the starting material. However, the use of mono-N-protected amino acid (MPAA) ligands dramatically improved both yield and enantioselectivity. Table 1 summarizes the optimization process. Traditional synthetic routes often rely on chiral pool starting materials or resolution of racemates, which limits structural diversity and scalability. Recent advances in transition-metal catalysis have opened new avenues for constructing these frameworks through direct functionalization of unactivated C–H bonds. Table 1 summarizes the optimization process. Traditional synthetic routes often rely on chiral pool starting materials or resolution of racemates, which limits structural diversity and scalability. Recent advances in transition-metal catalysis have opened new avenues for constructing these frameworks through direct functionalization of unactivated C–H bonds.