N-Heterocyclic carbene-catalyzed asymmetric construction of cyclopentenones using enals and α-diketones is achieved, furnishing a series of highly functionalized cyclopentenones in a highly diastereo- and enantioselective manner. The protocol tolerates substrates with both aromatic and aliphatic groups, and further transformations of the products delivered a range of value-added molecules.
Copper-catalyzed divergent annulations between α-diketones and alkynyl α-diketones have been achieved, delivering a series of highly functionalized and biologically important cis-hexahydro-2H-cyclopenta[b]furan (HCPF) and 2-hydroxydihydrofuran-3(2H)-one (HDFO) products with high levels of stereoselectivity under identical conditions. The protocol features the use of earth-abundant copper catalyst,
铜催化的α-二酮和炔基α-二酮之间的发散环化已经实现,提供了一系列高度功能化和生物学上重要的顺式-六氢-2H-环戊二烯[ b ]呋喃(HCPF)和2-羟基二氢呋喃-3(2 H )-one (HDFO) 产品在相同条件下具有高水平的立体选择性。该协议的特点是使用地球上丰富的铜催化剂,条件温和,缩短构建不同分子框架的合成路线,减少相应的可能产生的废物。亲核α-二酮的取代基在转换反应途径中起关键作用。
BUBEL, O. N.;TISHCHENKO, I. G.;GRINKEVICH, O. A., XIMIYA GETEROTSIKL. SOEDIN., 1985, N 12, 1624-1628
作者:BUBEL, O. N.、TISHCHENKO, I. G.、GRINKEVICH, O. A.