Radical Zinc-Atom Transfer Based Multicomponent Approaches to 3-Alkylidene-Substituted Tetrahydrofurans
作者:Fabrice Chemla、Alejandro Pérez-Luna、Florian Dulong、Franck Ferreira、Max Nüllen
DOI:10.1055/s-0030-1259993
日期:2011.5
A domino 1,4-addition/alkyne carbozincation sequence based on a radical zinc-atom transfer process is disclosed. Two efficient multicomponent approaches to 3-alkylidenetetrahydrofurans from β-(propargyloxy)enoates bearing pendant alkynes (including ynamides) have been established: one involving the direct addition of dialkylzincs, and the second involving the dimethylzinc-mediated addition of alkyl
公开了基于自由基锌原子转移过程的多米诺骨牌1,4-加成/炔烃羰基化序列。已经建立了两种有效的从带有侧链炔烃(包括乙酰胺)的β-(炔丙氧基)烯酸酯中分离3-亚烷基四氢呋喃的有效方法:一种涉及直接添加二烷基锌,另一种涉及由二甲基锌介导的烷基碘的添加。两种序列都利用中间亚烷基的立体选择性形成,非常适合 用亲电子试剂原位官能化。 1引言 β-(炔丙氧基)烯酸酯上二烷基锌的2 1,4-加成/环化 2.1β-(炔丙氧基)与末端悬垂炔基的烯酸酯 2.2β-(炔丙氧基)烯酸酯与侧链取代的炔烃 2.3β-(炔丙氧基)与侧链酰胺 3 1,4-卤代烷基锌在β-(炔丙氧基)烯酸酯上的加成/环化反应 4二烷基锌介导的β-(炔丙氧基)烯酸酯上碘烷基的1,4-加成/环化 5结论;当前和未来的工作 锌-自由基-串联反应-炔烃-金属化