Palladium-Catalyzed Coupling of Propargylic Carbonates with N-Tosylhydrazones: Highly Selective Synthesis of Substituted Propargylic N-Sulfonylhydrazones and Vinylallenes
作者:Zi-Sheng Chen、Xin-Hua Duan、Lu-Yong Wu、Shaukat Ali、Ke-Gong Ji、Ping-Xin Zhou、Xue-Yuan Liu、Yong-Min Liang
DOI:10.1002/chem.201100248
日期:2011.6.14
An efficient palladium‐catalyzed coupling of propargylic carbonates (1) with N‐tosylhydrazones (2, 2′) has been carried out. A wide range of propargylic N‐sulfonylhydrazones (3) and multisubstituted vinylallenes (4) can be obtained selectively by using either [PdCl2(CH3CN)2] or [Pd2(dba)3] as catalysts. (dba=trans,trans‐dibenzylideneacetone, dppp=propane‐l,3‐diylbis(diphenylphosphane), Ts=4‐toluenesulfonyl
高效的钯催化的炔丙基碳酸酯(1)与N-甲苯磺酰hydr(2,2')的偶联。通过使用[PdCl 2(CH 3 CN)2 ]或[Pd 2(dba)3 ]作为催化剂,可以选择性地获得各种各样的炔丙基N-磺酰基hydr (3)和多取代的乙烯基烯丙基(4)。(dba =反式,反式-二亚苄基丙酮,dppp =丙烷-1,3-二基双(二苯基膦),Ts = 4-甲苯磺酰基。)