It was found that sodium salt of 1,2-benzisothiazole-3(2H)-thione 1,1-dioxide (thiosaccharin) readily reacted with alkyl halide affording 3-(alkylthio)-1,2-benzisothiazole 1,1-dioxide (3). Treatment of 3 with piperidine produces the corresponding alkanethiol in situ quantitatively and subsequent treatment with various electrophiles gives the corresponding sulfides and thiocarboxylic S-esters in good yields.
A novel approach for the direct conversion of alkylsulfonyl derivatives into alkylcarbonyl derivatives via tin-free radical carbonylation
作者:Sangmo Kim、Kyoung-Chan Lim、Sunggak Kim
DOI:10.1039/b710939c
日期:——
A novel radical approach for the directconversion of RSO(2)X into RCOX in a single step is devised; the present approach is very simple, highly efficient, and minimizes formation of by-product.
N′-diphenylthiourea, triethylamine, and primary alkyl halides is described. Microwave-assisted heating and a catalytic amount of 4-(dimethylamino)pyridine (DMAP) further improved the yields. Both aromatic and aliphatic carboxylic acids were converted to the corresponding thioesters, and many functionalgroups were compatible with this reaction. Several possible reaction intermediates were investigated, and the
Different thiols were efficiently acylated at room temperature with different anhydrides in the presence of potassium carbonate. Chemoselective protection of thiol in the presence of hydroxy group was achieved using di-tert-butyl dicarbonate and isatoic anhydride.
Preparation of 4-[alkyl-(or aryl)-thio-substituted]-1,4-dihydropyridines and their use as thiolate-transferring agents
作者:Oscar Piepers、Richard M. Kellogg
DOI:10.1039/c39800001147
日期:——
Alkane-(or arene)-thiols or thiolates add smoothly to esters or amides of 1-methylpyridinium-3,5-dicarboxylic acid salts; on treatment of these adducts with activated acid-derivatives, thioesters are formed in excellent yields.