Preparation of cycloaddition chemistry of thio- and selenocarbonyls derived from reaction of elemental sulfur and selenium with stabilized α-halo anions
作者:Matthew M. Abelman
DOI:10.1016/0040-4039(91)80114-l
日期:1991.12
Reaction of diethyl chloromalonate with Cs2CO3 in the presence of elemental S8 or Sen generates the corresponding diethyl thioxo- or selenoxomalonates which are subsequently trapped in situ with various 1,3-dienes. Similarly, the chalcogen carbonyls can be prepared from other halogenated using DBU as the base and effectively trapped in Diels-Alder fashion with 2,3-dimethyl-1,3-butadiene (Table 2).