Reactivities of tetraphenyldisilane (TPDS), tris(trimethylsilyl)silane, and tributyltin hydride in the radical ring expansion of α-haloalkyl cyclic β-keto esters were examined. Among these reagents, TPDS was found most effective for the preparation of medium-sized cyclic compounds in terms of yields and ring-expansion/reduction selectivity.
考察了四苯基二
硅烷 (
TPDS)、三(三甲基甲
硅烷基)
硅烷和三丁基氢化
锡在 α-卤代烷基环状 β-
酮酯自由基扩环中的反应性。在这些试剂中,发现
TPDS 在产率和扩环/还原选择性方面对制备中等大小的环状化合物最有效。