enolate of carboxylic acid tert-butyl esters or N,N-dimethylacetamide gave adducts in high yields. The adducts were treated with ether solution of isopropylmagnesiumchloride in dry toluene to give bicyclo[n.1.0]alkane derivatives having tert-butyl carboxylate or acetamide moiety on the bridgehead carbon in high to quantitative yields via magnesium carbenoid 1,3-CH insertion reaction. The 1,3-CH insertion
Direct alkenylation of arylamines at the ortho-position
作者:Tsuyoshi Satoh、Yumi Ogino、Masatomo Nakamura
DOI:10.1016/j.tetlet.2004.06.024
日期:2004.7
gave ortho-alkenylated arylamines in moderate to good yields. The reaction was found to proceed in a highly stereospecific manner at the carbenoid carbon. This reaction offers a quite novel and directalkenylation of arylamines at the ortho-position of the aromatic ring.
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.
Direct N- and C-alkenylation of nitrogen-containing heterocycles with magnesium alkylidene carbenoids
作者:Jo Sakurada、Tsuyoshi Satoh
DOI:10.1016/j.tet.2007.02.072
日期:2007.4
Treatment of magnesium alkylidene carbenoids, which were generated from 1-chlorovinyl p-tolyl sulfoxides with isopropylmagnesium chloride at -78 degrees C in toluene, with N-lithio nitrogen-containing heterocycles gave N-alkenylated products in moderate to good yields. Also, the reaction of C-lithio indoles, which were generated from N-protected indoles, with magnesium alkylidene carbenoids gave C-2 or C-3 alkenylated products, corresponding to the protective group. The intermediate of these reactions were found to be the alkenyl anion, which could be trapped with electrophiles to give the heterocycles having fully substituted alkenes. (C) 2007 Elsevier Ltd. All rights reserved.