Synthesis of Aromatic Bisabolene Natural Products via Palladium-Catalyzed Cross-Couplings of Organozinc Reagents
作者:James R. Vyvyan、Celeste Loitz、Ryan E. Looper、Cheryl S. Mattingly、Emily A. Peterson、Steven T. Staben
DOI:10.1021/jo035778s
日期:2004.4.1
Aromatic bisabolene derivatives were prepared by two methods involving cross-coupling of organozinc reagents. The first synthesis of (±)-glandulone A (10), as well as syntheses of (±)-curcuhydroquinone (8) and (±)-curcuquinone (9), were accomplished via coupling of a secondary alkyl zinc reagent (1,5-dimethyl-4-hexenylzinc halide, 18) to protected bromohydroquinones using Pd(dppf)Cl2 as catalyst. Coupling
通过两种方法将芳族双sabolene衍生物制备,该方法涉及有机锌试剂的交叉偶联。(±)-格兰丁酮A(10)的首次合成,以及(±)-curcuhydroquinone(8)和(±)-curcuquinone(9)的合成是通过偶联烷基锌锌试剂(1,使用Pd(dppf)Cl 2作为催化剂,将5-二甲基-4-己烯基卤化锌(18)还原成受保护的溴代氢醌。使用Pd(PPh 3)4催化剂将芳基锌卤化物与三氟甲磺酸烯基酯16偶联提供了许多双萜烯衍生物,并导致了脱氢-α-姜黄烯(2),(±)-姜酚(3)的合成。)和(±)-elvirol(13)。还报道了使用该方法的高产率合成(±)-香螺酚D前体29。