Palladium-Mediated Cyclization on Carbohydrate Templates Synthesis of Enantiopure Annelated Tricyclic Compounds
作者:Denis Sinou、Karim Bedjeguelal
DOI:10.1002/1099-0690(200012)2000:24<4071::aid-ejoc4071>3.0.co;2-1
日期:2000.12
using the same methodology as for 2, after inversion of configuration at C-4 by means of a Mitsunobu reaction. Treatment of the unsaturated carbohydrates 2−4, 6−8, and 10 with a catalytic amount of Pd(OAc)2/PPh3 in DMF in the presence of Bu4NHSO4 and NEt3 afforded the annelated tricyclic compounds 11−13 and 15−18 in good yields when the anomeric substituent was the p-tert-butylphenyl group, via an intramolecular
各种溴不饱和碳水化合物 2-4 已从乙基和芳基 4,6-di-O-acetyl-2,3-dideoxy-α-D-erythro-hex-2-enopyranoside 通过脱乙酰作用制备,然后首先用 TBDMSCl 进行单甲硅烷基化然后用2-溴苄基溴或1-溴-溴甲基环烯烃烷基化。N-、C-和 O-类似物 6-8 是通过钯介导的碳酸盐 5 与 TsNHCH2-C6H4-o-Br、(CO2Me)2CH-C6H4-o-Br 和 HOC6H4-oI 的烷基化制备的,分别。苏式类似物 10 使用与 2 相同的方法获得,在 C-4 处通过 Mitsunobu 反应反转构型之后。不饱和碳水化合物2-4、6-8的处理,