Heck reactions of aryl bromides with alk-1-en-3-ol derivatives catalysed by a tetraphosphine/palladium complex
摘要:
cis,cis,cis-1,2,3,4-Tetrikis(diplienylphosphinomethyl)cyclopentane/[PdCl(C3H5)](2) efficiently catalyses the Heck reaction of alk-1-en-3-ol with a variety of aryl bromides. In the presence of hex-1-en-3-ol or oct-1-en-3-ol, the beta-arylated carbonyl compounds were selectively obtained. Linalool and 2-methylbut-3-en-2-ol led to the corresponding 1-arylalk-1-en-3-ol derivatives. Turnover numbers up to 69,000 can be obtained for this reaction. A minor electronic effect of the substituents of the aryl bromide was observed. Similar reaction rates were observed in the presence of activated aryl bromides Such as bromoacetophenone and deactivated aryl bromides such as bromoanisole. (C) 2004 Elsevier Ltd. All rights reserved.
Synthesis and structure–immunosuppressive activity relationships of bakuchiol and its derivatives
作者:Hongli Chen、Xiaolong Du、Wei Tang、Yu Zhou、Jianping Zuo、Huijin Feng、Yuanchao Li
DOI:10.1016/j.bmc.2007.11.054
日期:2008.3
A series of derivatives of bakuchiol were synthesized and tested in vitro for their cytotoxicity, and inhibition of T cell proliferation and B cell proliferation. The data obtained provided preliminary structure-activity relationships of the compounds as immunosuppressive activity. (C) 2007 Elsevier Ltd. All rights reserved.
BALLESTER, PABLO;CAPO, MAGDALENA;SAA, JOSE M., TETRAHEDRON LETT., 31,(1990) N, C. 1339-1342