tetrahydro-β-carbolines 8, 9b, and 9d are described. The Pictet-Spengler reaction of L-tryptophyl-L-proline methyl ester with 3-methylbutanal gave the tetrahydro-β-carbolines 20 and 21; subsequent acid-catalysed cyclisation afforded the fumitremorgin analogues 22 and 23. The 2-(p-toluenesulphonyl)tetrahydro-β-carboline 27a furnished the unsaturated pentacycle 28a upon treatment with alkali.
的四氢β咔啉的制剂8,图9B,和图9d中描述。
L-色氨酸-
L-脯氨酸甲酯与
3-甲基丁醛的Pictet-Spengler反应得到四氢-β-咔啉20和21。随后的酸催化环化提供了fumitremorgin类似物22和23。在用碱处理后,2-(对
甲苯磺酰基)四氢-β-咔啉27a提供了不饱和五环28a。