Pd-Catalyzed Regio- and Stereoselective Cyclization−Heck Reaction of Monoesters of 1,2-Allenyl Phosphonic Acids with Alkenes
作者:Fei Yu、Xiongdong Lian、Shengming Ma
DOI:10.1021/ol0703478
日期:2007.4.1
[reaction: see text] The cyclization-Heck reactions of monoesters of 1, 2-allenyl phosphonicacids with alkenes were studied. The reaction afforded 4-(1-Z-alkenyl)-2-ethoxy-2,5-dihydro[1,2]oxaphosphole 2-oxides regio- and stereoselectively. Pd(II) was regenerated from the in situ formed Pd(0) using CaH2(cat.)/NaI/O2 or benzoquinone to furnish the catalytic cycle.
[反应:见正文]研究了1,2-烯基膦酸单酯与烯烃的环化-Heck反应。反应得到区域和立体选择性的4-(1-Z-烯基)-2-乙氧基-2,5-二氢[1,2]氧磷2-氧化物。使用CaH2(cat。)/ NaI / O2或苯醌从原位形成的Pd(0)再生Pd(II),以提供催化循环。