Palladium catalyzed insertion of carbon monoxide into benzyl-tetrahydroisoquinolines
作者:Ganesh D. Pandey、Kamala P. Tiwari
DOI:10.1016/s0040-4020(01)92052-6
日期:1981.1
A new total synthesis of the berbine alkaloid ring system has been achieved. Palladium catalyzed insertion of carbon monoxide into the 1 - (2 - bromobenzyl) - substituted - 1,2,3,4 - tetrahydroisoquinolines (1a–1d) by the use of catalytic amounts of palladium diacetate and triphenylphosphine in the presence of tri-n-butylamine afforded the berbin-8-ones (2a–2d) which, on reduction with lithium aluminium
已经获得了新的贝宾生物碱环系统的全合成。钯催化的三乙酸存在下,使用催化量的二乙酸钯和三苯基膦将一氧化碳插入1-(2-溴苄基)-取代的1,2,3,4-四氢异喹啉(1a - 1d)中丁胺提供了berbin-8-ones(2a - 2d),用氢化铝锂还原后,得到了berbines(±)-小b碱3a,(±)2,3-二甲氧基小b碱3b,(±)-xylopinine 3c和( ±)-pseudoepipitetrahydroberbine 3d。