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Beilstein J. Org. Chem. 2022, 18, 1471–1478, doi:10.3762/bjoc.18.154
Graphical Abstract
Figure 1: Chiral phosphorus acids (CPAs) derived from BINOL, VAPOL, and SPINOL. R = H, Ph, 4-PhC6H4-, 4-β-nap...
Scheme 1: The thiolic/thionic tautomeric equilibrium in thiophosphorus acids.
Figure 2: Project strategy and requirements for C1-symmetrical CPAs.
Figure 3: BINOL CPA and C1-symmetrical CPA targets 1–4.
Scheme 2: Synthesis of tryptophol-derived thiophosphorus acid 1.
Scheme 3: Synthesis of indole-derived thiophosphorus acid 2.
Scheme 4: Synthesis of N-biphenyl-DOPO CPA 4.
Scheme 5: Transfer hydrogenation of 2-phenylquinoline and transition-state proposed by Guinchard and coworker...