6-exo-trig Michael addition-lactonizations for catalytic enantioselective chromenone synthesis
作者:Rifahath M. Neyyappadath、David B. Cordes、Alexandra M. Z. Slawin、Andrew D. Smith
DOI:10.1039/c6cc10178j
日期:——
The catalyticenantioselective 6-exo-trig Michael addition-lactonization of enone-acid substrates to form cis-chromenones with high diastereo- and enantiocontrol was developed using the commercially available isothiourea tetramisole. An acidic workup proved necessary...