[4 + 2]-Cycloaddition and 1,4-Addition of <i>ortho</i>-Quinone Methides by a Chiral Crotyl Silane
作者:Christopher R. Wong、Gerald Hummel、Yongqi Cai、Scott E. Schaus、James S. Panek
DOI:10.1021/acs.orglett.8b03395
日期:2019.1.4
ortho-quinone methides (oQMs). The reaction produces both the chiral chroman and crotylation products in a ratio reflective of the electronic nature of the parent oQM with overall combined yields up to 96%. A ring-opening and elimination sequence was subsequently developed to provide direct access to the crotylation products, containing two contiguous tertiary carbon stereocenters, in good yields and enantioselectivities