A variety of a-branched alkynes can be easily assembled by a Knoevenagel type condensation of 4-unsubstituted isoxazolin-5-ones with aldehydes or ketones, followed by conjugate addition of an organometallic reagent and nitrosative cleavage of the heterocyclic ring.
通过 4-未取代的
异恶唑啉-5-酮与醛或酮的 Knoevenagel 型缩合,然后是有机
金属试剂的共轭加成和杂环的亚硝基裂解,可以轻松组装各种 α-支链
炔烃。