作者:Keisuke Maki、Motomu Kanai、Masakatsu Shibasaki
DOI:10.1016/j.tet.2007.03.062
日期:2007.5
A Pd-catalyzed allylic alkylation of secondary nitroalkanes, using a catalytic amount of external base, was developed. Simple allyl carbonate and monosubstituted allyl carbonates were used as electrophiles, and bulky secondary nitroalkanes were used as nucleophiles. This is the first catalytic allylic alkylation of bulky secondary nitroalkanes, such as 2-nitroheptane. The use of the strong base DBU
利用催化量的外部碱,开发了钯催化仲硝基烷烃的烯丙基烷基化反应。简单的碳酸烯丙酯和单取代的碳酸烯丙酯用作亲电子试剂,大体积的仲硝基烷烃用作亲核试剂。这是庞大的仲硝基烷烃(例如2-硝基庚烷)的第一个催化烯丙基烷基化反应。在非质子极性溶剂DMSO中使用强碱DBU是实现高反应活性的关键。为了发展不对称反应,2-芳基恶唑啉配体PHOX L1在诱导π-烯丙基部分的手性方面给出了极好的结果。至于在NO 2官能团的α位上的不对称诱导,含游离OH-基团的2-芳基恶唑啉配体L4 表现出中等选择性。