The Pictet–Spengler reaction of nitrones and imines prepared from N-hydroxytryptamine and tryptamine gave the corresponding tetrahydro-β-carbolines in excellent yields in the presence of Yb(OTf)3–TMSCl in a mixture of CH2Cl2 and THF.
N-羟基色
氨酸和色
氨酸制备的氮杂烯和
亚胺的Pictet–Spengler反应在Yb(OTf)3–TMSCl的存在下,在
CH2Cl2和THF的混合物中生成了相应的四氢-β-卡宾烷,产率极佳。