Novel Phosphine-Catalyzed Zipper Cyclization of Aliphatic Diyne−Dione and Yne−Dione Systems
摘要:
An unexpected tri-n-butylphosphine-catalyzed zipper cyclization of diyne-diones (1a-d) or yne-diones (1e and 1f) is described. Bicyclic ketones (2a, 2b, 2c, 2e, and 2f) with five- or six-membered rings fused to the five-membered ring were obtained from both aliphatic diyne-diones (1a-c) and yne-diones (le and 10 having tetra- or pentamethylene spacers. The bicyclic products (2) were produced with high diastereoselectivity.
Novel Phosphine-Catalyzed Zipper Cyclization of Aliphatic Diyne−Dione and Yne−Dione Systems
作者:Hirofumi Kuroda、Ikuyoshi Tomita、Takeshi Endo
DOI:10.1021/ol020198n
日期:2003.1.1
An unexpected tri-n-butylphosphine-catalyzed zipper cyclization of diyne-diones (1a-d) or yne-diones (1e and 1f) is described. Bicyclic ketones (2a, 2b, 2c, 2e, and 2f) with five- or six-membered rings fused to the five-membered ring were obtained from both aliphatic diyne-diones (1a-c) and yne-diones (le and 10 having tetra- or pentamethylene spacers. The bicyclic products (2) were produced with high diastereoselectivity.