A New Synthesis of 2-Cyano-6-hydroxybenzothiazole, the Key Intermediate of d-Luciferin, Starting from 1,4-Benzoquinone
作者:Enzo Santaniello、Giuseppe Meroni、Paolo Ciana、Adriana Maggi
DOI:10.1055/s-0029-1217971
日期:2009.10
D-luciferin, the natural substrate of firefly luciferases. A new synthesis of2-cyano-6-hydroxybenzothiazole has been realized starting from the reaction of 1,4-benzoquinone with L-cysteine ethyl ester, followed by oxidation-cyclization of the intermediate ethyl (R)-2-amino-3-(2,5-dihydroxyphenylsulfanyl)propanoate hydrochloride to 2-carbethoxy-6-hydroxybenzothiazole. A suitable protection of this intermediate
2-Cyano-6-hydroxybenzothiazole 是合成 D-荧光素(萤火虫荧光素酶的天然底物)的关键中间体。从1,4-苯醌与L-半胱氨酸乙酯的反应开始,然后中间体乙基(R)-2-氨基-3-( 2,5-二羟基苯硫基)丙酸酯盐酸盐转化为 2-carbethoxy-6-hydroxybenzothiazole。对该中间体进行合适的保护并转化为相应的腈,在脱保护后得到 2-氰基-6-羟基苯并噻唑(1,4-苯醌的产率为 32%)。该腈与 D-半胱氨酸反应,在室温下以几乎定量的产率 (90-95%) 提供 D-荧光素。