the bromoketals 3, 7a-g and 11 with tri-n-butyltin chloride and sodium cyanoborohydride in the presence of a catalytic amount of AIBN furnished the ethers 5, 8a-g and 13 via a tandem sequence comprising of a radical cyclisation reaction and tri-n-butylhalostannane and sodium cyanoborohydride mediated reductive demethoxylation of the resulting cyclic ketals.
所述bromoketals的反应3,图7a-克和11用三正
丁基锡氯化物和
氰基硼氢化钠在AIBN催化量的存在提供的醚5,图8A-G和13经由串联序列,其包含自由基环化反应的以及三正丁基卤
烷烃和
氰基硼氢化钠介导的环状
缩酮的还原性脱甲氧基化。