Palladium-Catalyzed Cross-Coupling Reactions in One-Pot Multicatalytic Processes
作者:Hélène Lebel、Chehla Ladjel、Lise Bréthous
DOI:10.1021/ja0733235
日期:2007.10.1
Palladium-catalyzedcross-couplingreactions have been investigated in multicatalytic processes to synthesize disubstituted alkenes and alkanes from carbonyl derivatives. The use of copper-catalyzed methylenation reactions is the key starting reaction to produce terminal alkenes which are not isolated, but submitted to further structure elongation. Not only is the isolation of the alkene intermediate
The cross metathesis of methoxy- or acetoxy-substituted styrenes using the Grubbs II catalyst affords unsymmetrical (mixed) E-stilbenes with astonishingly high selectivity (up to 79% yield). This approach offers a short and flexible synthesis of variously substitutedstilbenes, which are derivatives or precursors of biologically important compounds such as resveratrol, piceatannol, and pinostilbene
使用 Grubbs II 催化剂对甲氧基或乙酰氧基取代的苯乙烯进行交叉复分解,得到了具有惊人高选择性(高达 79% 产率)的不对称(混合)E-二苯乙烯。这种方法提供了各种取代的二苯乙烯的短而灵活的合成,它们是生物重要化合物如白藜芦醇、白杉醇和松芪的衍生物或前体。
Stilbenes of Gnetum ula
作者:Satya Prakash、Mushtaq A. Khan、Khaliquz Zaman Khan、Asif Zaman
DOI:10.1016/s0031-9422(00)80789-x
日期:——
Abstract Gnetin, a new stilbene isolated fromGnetumula is assigned the structure 3,4-methylenedioxy-4′-methoxy- trans -stilbene, 3 on the basis of spectroscopic data and synthesis. The structure 3,3′,4-trihydroxy-2-methoxy- trans -stilbene, 1a earlier assigned to a trihydroxymonomethoxy stilbene is now revised to 3,4,5′-trihydroxy-3′-methoxy- trans -stilbene, 1b .