Reaction Control in Synthetic Organic Photochemistry: Switching between [5+2] and [2+2] Modes of Cycloaddition
作者:Claudio Roscini、Kara L. Cubbage、Malcolm Berry、Andrew J. Orr-Ewing、Kevin I. Booker-Milburn
DOI:10.1002/anie.200904059
日期:2009.11.2
Split personality: Reaction conditions that enable powerful control over the mode of photocycloaddition in maleimides have been developed. Direct irradiation favors the [5+2] mode whereas sensitized irradiation allows a complete switch to the [2+2] mode (see scheme; TBS=tert‐butyldimethylsilyl).
The synthesis of cyclic allylborates was achieved by the reaction of 1,3-dienes and B2pin2 using a copper catalyst. The cyclic allylborate could be used in several organic transformations such as regioselective protonation, the allylation of electrophiles, and Suzuki–Miyaura coupling.
环状烯丙基硼酸盐的合成是通过 1,3-二烯和 B 2 pin 2使用铜催化剂反应来实现的。环状烯丙基硼酸盐可用于多种有机转化,例如区域选择性质子化、亲电试剂的烯丙基化和 Suzuki-Miyaura 偶联。