Rhodium-catalyzed asymmetric 1,4-addition of 2-alkenyl-1,3,2-benzodioxaboroles to α,β-unsaturated ketones
作者:Yoshiaki Takaya、Masamichi Ogasawara、Tamio Hayashi
DOI:10.1016/s0040-4039(98)01866-8
日期:1998.11
with catecholborane, with α,β-unsaturated ketones in the presence of catalyst and triethylamine in proceeded with high enantioselectivity at 100 °C to give high yields of optically active β-alkenyl ketones of over 90% ee. One pot synthesis of the 1,4-addition product is also successful in the rhodium-catalyzed asymmetric reaction by use of alkenylboranes generated in situ from alkyne and catecholborane
在催化剂和三乙胺的存在下,炔烃与儿茶酚硼烷的硼氢化反应容易制得的2-烯基-1,3,2-苯并二恶杂硼酸酯与α,β-不饱和酮的反应在100°C下以高对映选择性进行ee超过90%ee的高光学活性β-烯基酮收率。通过使用从炔烃和儿茶酚硼烷原位生成的烯基硼烷,在铑催化的不对称反应中也成功完成了1,4-加成产物的一锅合成。