3‐butadienes with various substitution patterns were formed in good to high yields in a copper‐catalyzed borylation of α‐alkoxy allenes with bis(pinacolato)diboron (see scheme; Bn=benzyl, pin=pinacolate, L is an N‐heterocyclic carbene ligand). The products were found to be useful intermediates for the synthesis of cyclic vinyl boranes, α,β‐unsaturated ketones, and functionalized multisubstituted dienes.
可依靠的固体:在
铜催化的α-烷氧基
丙二烯与双(
频哪醇)二
硼烷的
硼化中,以高至高的产率形成了具有各种取代方式的2-苄基
1,3-丁二烯(参见图式; Bn =苄基, pin = pinacolate,L为N杂环卡宾
配体)。发现该产物是合成环状
乙烯基硼烷,α,β-不饱和酮和官能化的多取代二烯的有用中间体。