Olefination and hydroxymethylation of aldehydes using Knochel's (dialkoxyboryl)methylcopper reagents
作者:Masaaki Sakai、Syunn Saito、Gen Kanai、Akira Suzuki、Norio Miyaura
DOI:10.1016/0040-4020(95)00950-7
日期:1996.1
by its addition to aldehydes in the presence of boron trifluoride etherate yielded rather stable β-hydroxyalkylboronates (5). The thermal dehydroxyboronation or the alkaline hydrogen peroxide oxidation of 5 gave the corresponding alkenes (6) or 1,2-alkanediols (7) in high yields. The reaction provides a simple procedure for the olefination or the hydroxymethylation of aldehydes.
用Knochel的(二烷氧基硼烷基)甲基锌试剂(2)和CuCN•2LiCl在THF中原位制备[(Me 2 C)2 O 2 BCH 2 ] Cu(CN)ZnI(3),然后将其添加到乙醛中。三氟化硼醚化物的存在会产生相当稳定的β-羟烷基硼酸酯(5)。热dehydroxyboronation或的碱性过氧化氢的氧化5得到相应的烯烃(6)或1,2-烷二醇(7以高收率)。该反应提供了用于醛的烯化或羟甲基化的简单程序。