Copper(I) Salt Promoted Reactions of Sulfur Nucleophiles with Vinyl Bromides. Simple and Straightforward Preparations of S-Vinyl Thiobenzoates and S,S′-Vinylidene Bisthiobenzoates
Copper(I) salt promoted reaction of vinyl bromides with dibenzoyl disulfide in hot aprotic polar solvent produced thiophene derivatives in moderate yields, while the corresponding reaction with sodium thiobenzoate led to S-vinyl thiobenzoates in good yields.
Free radical reactions of allyltributylstannane or 2-butenyltributylstannane with S-benzoyl Se-phenyl selenosulfide (1) gave S-allyl benzenecarbothioate or a mixture of S-2-butenyl and S-1-methyl-2-propenyl benzenecarbothioates, respectively. The reaction of tributylvinylstannane with 1 gave an addition product, whereas the reaction of tributylstyrylstannane gave an addition–elimination product.