The aldol reaction of several aldehydes with silyl enol ethers proceeded smoothly to give the corresponding aldols in good to high yields at −78 °C by using 1.0 mol% of a novel cationic species with tetrakis(pentafluorophenyl)borate anion.
Asymmetric Total Synthesis of (−)-(3<i>R</i>)-Inthomycin C
作者:Sandra Balcells、Maxwell B. Haughey、Johannes C. L. Walker、Laia Josa-Culleré、Christopher Towers、Timothy J. Donohoe
DOI:10.1021/acs.orglett.8b01370
日期:2018.6.15
A short (10 step) and efficient (15% overall yield) synthesis of the natural product (−)-(3R)-inthomycin C is reported. The key steps comprise three C–C bond-forming reactions: (i) a vinylogous Mukaiyama aldol, (ii) an olefin cross-metathesis reaction, and (iii) an asymmetric Mukaiyama–Kiyooka aldol. This route is notable for its brevity and has the advantage of lacking stoichiometric tin-promoted