K. Takahashi et S. Tarutani, EFFICIENT SYNTHESIS OF 2-IODO AND 2-DICYANOMETHYL DERIVATIVES OF THIOPHENE, SELENOPHENE, TELLUROPHENE, AND THIENO[3,2-B]THIOPHENE, Heterocycles, 43(9), 1996, pp. 1927-1935
An effective synthesis of 2-iodothiophene, 2-iodotellurophene, and 2-i
odothieno[3,2-b]thiophene and a Pd-catalyzed carbon-carbon coupling re
action of these iodo derivatives as well as 2-iodoselenophene with mal
ononitrile affording novel thienyl-, tellurienyl-, thieno[3,2-b]thieny
l-, and selenienylmalononitrile are described. These heteroarylmalonon
itriles are important synthons for the preparation of 2-dicyanomethyle
ne-2,5-dihydroheterophene chromophores.