Nickel-Catalyzed Arylation of C(sp<sup>3</sup>)–O Bonds in Allylic Alkyl Ethers with Organoboron Compounds
作者:Xiaowei Li、Yuxiu Li、Zhong Zhang、Xiaolin Shi、Ruihua Liu、Zemin Wang、Xiangqian Li、Dayong Shi
DOI:10.1021/acs.orglett.1c01879
日期:2021.9.3
A nickel-catalyzed cross-coupling of allylic alkyl ethers with organoboron compounds through the cleavage of the inert C(sp3)-O(alkyl) bonds is described. Several types of allylic alkyl ethers can be coupled with various boronic acids or their derivatives to give the corresponding products in good to excellent yields with wide functional group tolerance and excellent regioselectivity. The gram-scale
作者:Geniece Hallett-Tapley、Frances L. Cozens、Norman P. Schepp
DOI:10.1002/poc.1484
日期:2009.4
A series of α‐vinyl arylmethyl cations were generated and studied using nanosecond laser flash photolysis. Rate constants for the decay of the substituted α‐vinyl arylmethyl cations were determined under solvolytic conditions in pure solvents and solvent mixtures of 1,1,1,3,3,3‐hexafluoro‐2‐propanol (HFIP) and 2,2,2‐trifluoroethanol (TFE). In addition the absolute reactivity of the carbocations with
Electrochemical methoxylation of allyl and propenyl derivatives of phenol and phenol ethers
作者:Isidoro Barba、Rafael Chinchilla、Cecilia Gomez
DOI:10.1021/jo00297a051
日期:1990.5
Structure–activity relationships of 1′S-1′-acetoxychavicol acetate for inhibitory effect on NO production in lipopolysaccharide-activated mouse peritoneal macrophages
1'S-1'-Acetoxychavicol acetate from the rhizomes of Alpinia galanga inhibited nitric oxide (NO) production in lipopolysaccharide-activated mouse peritoneal macrophages with an IC50 value of 2.3 mu M. To clarify the structure-activity relationship of 1'S-1'-acetoxychavicol acetate, various natural and synthetic phenylpropanoids and synthetic phenylbutanoids were examined, and the following structural requirements were clarified. (1) The para or ortho substitution of the acetoxyl and 1-acetoxypropenyl groups at the benzene ring was essential. (2) The S configuration of the 1'-acetoxyl group was preferable. (3) The presence of the 3-methoxyl group and disappearance of the 2'-3' double bond by hydrogenation reduced the activity. (4) The substitution of acetyl groups with propionyl or methyl groups reduced the activity. (5) Lengthening of the carbon chain between the 1'- and 2'-positions reduced the activity. (c) 2005 Elsevier Ltd. All rights reserved.
BARBA, ISIDORO;CHINCHILLA, RAFAEL;GOMEZ, CECILIA, J. ORG. CHEM., 55,(1990) N0, C. 3270-3272