Metal-free cascade radical cyclization of 1,6-enynes with aldehydes†
Abstract
A new and efficient metal-free cascade cyclization of 1,6-enynes with aldehydes is developed for the synthesis of tricyclic fluorene derivatives. The reaction involves a radical process and one C(sp2)–C(sp2) and two C(sp2)–C(sp3) bonds are formed simultaneously in one pot by using PivOH and TBHP.