Asymmetric Addition of α-Diazomethylphosphonate to Alkylideneindolenine Catalyzed by a Trifunctional BINAP-Based Monophosphonium Salt
作者:Peng Zhu、Yi Yang、Yan Liu、Yungui Peng
DOI:10.1021/acs.orglett.2c00213
日期:2022.3.4
were developed and used in the asymmetric addition of α-diazomethylphosphonates to vinylogousimines formed in situfrom sulfonylindoles. This methodology tolerates a broad scope of 2-unsubstituted sulfonyl indoles, which have seldom achieved high enantioselectivities in similar asymmetric reactions with other nucleophiles. Chiral 3-sec-alkyl-substituted indoles containing α-diazophosphonate were afforded
Ag-Catalyzed Diastereo- and Enantioselective Synthesis of β-Substituted Tryptophans from Sulfonylindoles
作者:Bao-Hui Zheng、Chang-Hua Ding、Xue-Long Hou、Li-Xin Dai
DOI:10.1021/ol100161n
日期:2010.4.16
The asymmetric catalytic synthesis of beta-substituted tryptophan derivatives was realized in high diastereo- and enantioselectivity by the reaction of glycine derivatives with sulfonylindoles in the presence of catalyst derived from AgCl and a commercially available chiral monodentate phosphoramidite ligand. The resulting adduct was readily converted to beta-substituted tryptophan in 95% overall yield for two steps, which presented a highly efficient route to chiral beta-substituted tryptophan.