Similarly, the reactions ofp-tolyl chlorothionoformate and phenyl chlorodithioformate with a mixture of benzaldimine and isocyanide afford rapidly the 5-amino-4-phenylthiazolium salts. We suggest that these reactions involve the N-(thiocarbony1) formamidinium and benzylideniminium chlorides as transient intermediates, which are trapped by isocyanides according to a [l+ 41 cycloaddition process. The structure of the thiazolium salts and some ...
