名称:
Synthetic transformations of isoquinoline alkaloids. Synthesis of N′-substituted 1-alkynyl-7α,8α-(2,5-dioxopyrrolidino)-[3,4-h]-6,14-endo-ethenotetrahydrothebaines and their transformations
摘要:
The iodination of N'-substituted (2,5-dioxopyrrolidino)[3,4-h]-6,14-endo-ethenotetrahydrothebaines with N-iodosuccinimide in trifluoroacetic acid afforded depending on the excess of the reagent either 1-iodo- or 1,2-diiodoendo-ethenotetrahydrothebaines. The Sonogashira reaction of 1-iodo-6,14-endo-ethenotetrahydrothebaines with trimethylsilylacetylene led to the formation of N'-substituted 1-(trimethylsilylethynyl)-(2,5-dioxopyrrolidino)-[3,4-h]-6,14-endo-ethenotetrahydrothebaines whose desilylation cleanly furnished the corresponding 1-ethynylendo-ethenotetrahydrothebaines. The Mannich reaction of the acetylene derivatives of tetrahydrothebaine with amines and formaldehyde catalyzed by compounds of Cu(I) provided 1-[3-(morpholin-4-yl)propynyl]-, 1-[3-(4-methylpiperazin-1-yl)propynyl]-, and 1-[3-(4-tert-butoxycarbonylpiperazin-1-yl)propynyl]-(2,5-dioxopyrrolidino)[3,4-h]-6,14-endo-ethenotetrahydrothebaines.