New Building Blocks for Heterocyclic Syntheses. Silylated Methyl Isothiocyanates
作者:Toshikazu Hirao、Atsushi Yamada、Ken-ichiro Hayashi、Yoshiki Ohshiro、Toshio Agawa
DOI:10.1246/bcsj.55.1163
日期:1982.4
trimethylsilylmethyl isothiocyanate with aldehydes or ketones afforded oxazolidine-2-thione derivatives, which involves the isothiocyanato carbanion as an intermediate. Imidazolidine-2-thiones were similarly prepared from imines. The reaction of bis(trimethylsilyl)methyl isothiocyanate with benzaldehyde in the presence of a catalytic amount of n-Bu4NF gave styryl isothiocyanate and 5-phenyl-4-trimethylsilyloxazolidine-2-thione
制备了三甲基甲硅烷基甲基异硫氰酸酯、双(三甲基甲硅烷基)甲基异硫氰酸酯和三(三甲基甲硅烷基)甲基异硫氰酸酯。三甲基甲硅烷基甲基异硫氰酸酯与醛或酮的氟化物催化反应得到恶唑烷-2-硫酮衍生物,其中涉及异硫氰酸根碳负离子作为中间体。类似地从亚胺制备咪唑烷-2-硫酮。双(三甲基甲硅烷基)甲基异硫氰酸酯与苯甲醛在催化量的 n-Bu4NF 存在下反应得到异硫氰酸苯乙烯酯和 5-苯基-4-三甲基甲硅烷基恶唑烷-2-硫酮。在三(三甲基甲硅烷基)甲基异硫氰酸酯的类似处理中,得到4-苄基-5-苯基-4-恶唑啉-2-硫酮和α-(三甲基甲硅烷基)苯乙烯异硫氰酸酯。