Herein a new double O-directed free radical hydrostannation reaction is reported on the structurally complex dialkyldiyne 11. Through our use of a conformation-restraining acetal to help prevent stereocenter-compromising 1,5-H-atom abstraction reactions by vinyl radical intermediates, the two vinylstannanes of 10 were concurrently constructed with high stereocontrol using Ph3SnH/Et3B/O2. Distannane
在此,在结构上复杂的二烷基二炔11上报道了新的双O定向的自由基氢氢化反应。通过使用构象抑制性
乙缩醛来防止
乙烯基中间物损害立体中心损害的1,5-H原子抽象反应,使用Ph 3 SnH / Et 3 B / O同时构建了具有高立体控制性的10个
乙烯基锡烷2。然后,通过O-甲
硅烷基化和两次I-Sn交换,将Distannane 10精制为双
乙烯基碘化物9。9的双Stille偶联,O-去甲
硅烷基化和随后的氧化提供8。