Short and Stereoselective Total Synthesis of Furano Lignans (.+-.)-Dihydrosesamin, (.+-.)-Lariciresinol Dimethyl Ether, (.+-.)-Acuminatin Methyl Ether, (.+-.)-Sanshodiol Methyl Ether, (.+-.)-Lariciresinol, (.+-.)-Acuminatin, and (.+-.)-Lariciresinol Monomethyl Ether and Furofuran Lignans (.+-.)-Sesamin, (.+-.)-Eudesmin, (.+-.)-Piperitol Methyl Ether, (.+-.)-Pinoresinol, (.+-.)-Piperitol, and (.+-.)-Pinoresinol Monomethyl Ether by Radical Cyclization of Epoxides Using a Transition-Metal Radical Source.