A NEW RING OPENING REACTION OF 2-FURALDEHYDE DIPHENYL DITHIOACETAL VIA REDUCTIVE SILYLATION. PREPARATION OF 2,3,4-TRIS(TRIMETHYLSILYL)-3-ALKENYL AND 3,4,4-TRIS(TRIMETHYLSILYL)-2-BUTENYL KETONES
General conjugate-addition method for the synthesis of enantiomerically pure lignans. Total synthesis of (-)- and (+)-burseran, (-)-dehydroxycubebin, (-)-trichostin, (-)-cubebin, (-)-5''-methoxyhinokinin, and (-)-hinokinin