α-benzoyloxy-and α-methoxy-substituted glycine derivatives as atypical substrates for free-radical reactions with stannanes

α-Benzoyloxy-and α-methoxy-substituted glycine derivatives undergo homolytic reactions with tributyltin hydride to give the reduction product. With allyltributyltin they afford the product of allyl group transfer and the corresponding dimeric glycine derivative, while their reactions with hexabutylditin and di-tert-butyl disulfide afford the dimer and the α-tert-butylthio-substituted glycine derivative. The free-radical nature of these reactions is most clearly demonstrated in the formation of the glycine dimer.