Enantioselective Synthesis of Allylboronates and Allylic Alcohols by Copper-Catalyzed 1,6-Boration
作者:Yunfei Luo、Iain D. Roy、Amaël G. E. Madec、Hon Wai Lam
DOI:10.1002/anie.201310380
日期:2014.4.14
Chiral secondary allylboronates are obtained in high enantioselectivities and 1,6:1,4 ratios by the copper‐catalyzed 1,6‐boration of electron‐deficient dienes with bis(pinacolato)diboron (B2(pin)2). The reactions proceed efficiently using catalyst loadings as low as 0.0049 mol %. The allylboronates may be oxidized to the allylic alcohols, and can be used in stereoselective aldehyde allylborations.
手性仲烯丙基硼酸酯是通过铜催化的缺电子二烯与双(频哪醇)二硼(B 2(pin)2)的1,6-硼化反应而以高对映选择性和1,6:1,4的比例获得的。使用低至0.0049mol%的催化剂负载,反应有效地进行。烯丙基硼酸酯可以被氧化成烯丙基醇,并且可以用于立体选择性醛烯丙基硼酸酯中。该方法用于简明的阿托伐他汀合成,其中关键的1,6-硼化仅使用0.02 mol%的催化剂负载量即可进行。