作者:Juan C. Colberg、Anil Rane、Jaime Vaquer、John A. Soderquist
DOI:10.1021/ja00067a023
日期:1993.7
The hydroboration of 1-alkynes (1) was reinvestigated by 11 B NMR under optimized conditions (THF, 18 h, 0 o C) and found to provide trans-vinyl-9-BBN adducts (2) together with variable amounts of 1,1-diborylalkanes (3) depending both upon the excess of 1 employed and the nature of alkyne substitution. By contrast, the formation of 3 with 2 equiv of 9-BBN-H is quantitative. A new completely steroselective
1-炔烃 (1) 的硼氢化反应在优化条件 (THF, 18 h, 0 o C) 下通过 11 B NMR 重新研究,发现提供反式乙烯基-9-BBN 加合物 (2) 以及可变数量的 1, 1-二硼基烷烃 (3) 取决于所用 1 的过量和炔烃取代的性质。相比之下,3 与 2 当量 9-BBN-H 的形成是定量的。发现了一种新的完全立体选择性的路线,从 3 到 2,它在电循环过程中与 ArCHO 反应(p = 0.42)。虽然类似于米德兰还原,但引入了脱氢硼化这一术语以强调反应的烯化方面