A General Organocatalyzed Michael–Michael Cascade Reaction Generates Functionalized Cyclohexenes
作者:Patrick G. McGarraugh、Joshua H. Jones、Stacey E. Brenner-Moyer
DOI:10.1021/jo201140a
日期:2011.8.5
to α,β-unsaturatedaldehydes are susceptible to multiple subsequent reaction pathways. We designed cyclic unsaturated β-ketoester substrates that enabled the development of the first diphenyl prolinol silyl ether catalyzed Michael–Michael cascadereaction initiated by a β-dicarbonyl Michael donor to form cyclohexene products. The reaction conditions we developed for this Michael–Michael cascade reaction
A New Organocatalyzed Michael−Michael Cascade Reaction Generates Highly Substituted Fused Carbocycles
作者:Patrick G. McGarraugh、Stacey E. Brenner
DOI:10.1021/ol9024293
日期:2009.12.17
ineffective in Michael−Michael cascadereactions using α,β-unsaturated aldehydes in conjunction with diphenylprolinol silyl ether organocatalysts. However, through rational modification of substrates and manipulation of the catalytic cycle, we developed an efficient Michael−Michael cascadereaction using β-ketoesters of type 9. In this transformation, highlysubstituted fused carbocycles are generated
虽然 β-酮酯是有用的迈克尔供体,但它们以前在使用 α,β-不饱和醛与二苯基脯氨醇甲硅烷基醚有机催化剂的迈克尔-迈克尔级联反应中无效。然而,通过对底物的合理修饰和催化循环的操纵,我们开发了一种使用9型 β-酮酯的高效迈克尔-迈克尔级联反应。在这种转化中,高度取代的稠合碳环以高达 87% 的产率和 99% 的 ee 单步生成。