1- and 2-Naphthols were successfully alkenylated in a regioselective manner by treating the corresponding lithium 1- and 2-naphtholates with magnesium alkylidene carbenoids. The magnesium alkylidene carbenoids were generated in situ by a sulfoxide-magnesium exchange reaction of 1-chlorovinyl 4-tolyl sulfoxides with isopropylmagnesium chloride. The reaction of magnesium alkylidene carbenoids with lithium 2-naphtholates took place at the 1-position of the naphthyl ring to give 1-(alk-1-enyl)-2-naphthols in respectable yields. The alkenylation of 1-naphthols proceeded at the 2-position of the naphthol ring to give 2-(alk-1-enyl)-1-naphthols in yields of 56-67%. In contrast to the reaction of lithium naphtholates with magnesium alkylidene carbenoids, the reaction of lithium phenolates gave low yields of the corresponding alk-1-enyl aryl ethers.
Anti-Bacterial Compounds
申请人:Parker Jane Katy
公开号:US20080096894A1
公开(公告)日:2008-04-24
Compounds of formula (I), or salts or solvates thereof, in vitro as inhibitors of growth of Gram-positive bacteria, where A is selected from formula (a).
US7514406B2
申请人:——
公开号:US7514406B2
公开(公告)日:2009-04-07
Yasuda, Masahide; Sone, Tatsuya; Tanabe, Kimiko, Journal of the Chemical Society. Perkin transactions I, 1995, # 4, p. 459 - 464