Synthesis of new quinuclidine derivatives via Pd-mediated cross-coupling and cross-benzannulation reactions
作者:Stefania Tötös、Manfred Fild、Carsten Thöne、Ion Grosu
DOI:10.1016/j.tet.2009.05.030
日期:2009.8
palladium-catalyzed addition reactions of terminal alkynes (donors) to internal alkynes (acceptors). The enantiopure terminal alkynes were derivatives of quincoridine and quincorine, two semi-natural Cinchona alkaloids. The processes exhibited high chemoselectivity and excellent diastereoselectivity, the E-enynes being obtained as single products in almost all cases. The synthesis of new tetra and pentasubstituted
通过钯催化的末端炔烃(供体)与内部炔烃(受体)的加成反应制备了新的官能化奎核苷。对映体纯的末端炔烃是两种半天然金鸡纳生物碱喹可啶和喹可林的衍生物。该方法显示出高的化学选择性和出色的非对映选择性,E-烯炔几乎在所有情况下均作为单一产品获得。通过二炔的[2 + 2 + 2]苯并环合成高收率的新的四和五取代的苯衍生物,这是通过钯催化的10,11-二氢喹可啶和10,11-二氢喹可啶的钯二聚化,并带有末端炔烃报道了通过[4 + 2]使10,11-二氢喹可啶的烯炔衍生物与2,4-己烷-二炔的苯并环形成有可观的收率。