Treatment of phyllanthin(1) with TTFA in TFA gives dibenzocylooctadiene (2) and phyltetralin (3). Treatment of (1) with DDQ in TFA also affords (2) while with DDQ in acetic acid gives 1-phenylnaphthalenic lignan (4). Synthesis of halophyllanthins (5,6,7) and its Ullmann reaction in ultrasonic conditions offords reductive dehalogneted product (1) instead of (2). Treatment of (1) with POCl3 in TCA
... [Show full abstract] gives (+) 3,4-diveratryltetrahydrofuran (8) and its conversion to(9) also reported. Treatment of (8) with TTFA/TFA gives (9).