l-Prolinol as a chiral auxiliary in the photochemical synthesis of a new aryltetraline lignan analogue
摘要:
Prochiral (E,E)-fulgide 8 was reacted with L-prolinol to afford cyclic (M)-fulgamide 10 in a two step reaction sequence. The UV-light-driven photocyclization of 10 proceeded stereospecifically, giving lignan analogue 1 in 40% yield. The structure of 1 was confirmed by X-ray crystallography. (C) 2011 Elsevier Ltd. All rights reserved.