(E)-penta-1,3-diene (2d) with 2-vinyl-2,3-dihydro-1H-naphtho[1,8-de][1,3,2]diazaborinine (vinyl B(dan)) (3i) also gives a borylated-1,4-diene product. These cross-dimerizations give mono-borylated-1,4-dienes, yet cross-dimerizations using (1E,3E)-penta-1,3-dien-1-ylboronic acid pinacolate ester (2b) with vinyl B(dan) (3i) produce a diborylated-1,5-diene. Selective formation of 1,6-diborylated-1,5-dienes is
建立了一种制备
硼化1,4-和-1,5-二烯结构单元的新方法。Ru(0)-催化的 (1 E ,3 E )-penta-1,3-dien-1-ylboronic acid pinacolate ester ( 2b ) 与 but-3-en-2-one ( 3a ) 的交叉二聚选择性地产生一种
硼化-1,4-二烯产物,(3 E ,6 E )-5-methyl-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)octa-3,6 -dien-2-one,产率为 76%。( E )-penta-1,3-diene ( 2d ) 与 2-vinyl-2,3-dihydro-1 H -naphtho [1,8 - de ][1,3,2]diazaborinine (vinyl B(丹)) ( 3i) 还产生
硼化 1,4-二烯产物。这些交叉二聚反应产生单
硼化 1,4-二烯,但使用