Microwave‐Assisted Rhodium‐Complex‐Catalyzed Cascade Decarbonylation and Asymmetric Pauson–Khand‐Type Cyclizations
作者:Hang Wai Lee、Lai Na Lee、Albert S. C. Chan、Fuk Yee Kwong
DOI:10.1002/ejoc.200800272
日期:2008.7
Microwave-assisted Rh–diphosphane-complex-catalyzed dual catalysis is reported. This cooperative process provides [2+2+1] cycloadducts by sequential decarbonylation of aldehyde or formate and carbonylation of enynes within a short period of time. Various O-, N-, and C-tethered enynes were transformed into the corresponding products in good yields. The first enantioselective version of this microwave-accelerated
报道了微波辅助的 Rh-二膦复合物催化的双催化。这种协同过程通过醛或甲酸酯的顺序脱羰和烯炔的羰基化在短时间内提供 [2+2+1] 环加合物。各种O-、N-和C-系链烯炔以良好的产率转化为相应的产品。实现了这种微波加速级联环化的第一个对映选择性版本。在手性 Rh-(S)-bisbenzodioxanPhos 络合物的存在下,环戊烯酮产品的 ee 值高达 90%。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)