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• W2950565167 abstract "Crambescidins and batzelladines, novel marine guanidine alkaloids, have unique pentacyclic and tricyclic guanidine core structures, respectively. They display a considerable array of biological activity and not surprisingly have attracted considerable synthetic interest. The first total synthesis of crambescidin 359 (7) and stereoselective total synthesis of batzelladine D (11) were accomplished based on a successive 1,3-dipolar cycloaddition reaction strategy. During synthetic studies of 7, the absolute stereochemistry was revealed. Based on the structure of 7, the novel C2-symmetric pentacyclic guanidine compounds 69a—d were designed and synthesized as guanidine organocatalysts. The catalyst 69b works efficiently as an asymmetric catalyst of the alkylation reaction of the glycynate-benzophenone Schiff base 73, which gives 74 with 80—90% ee." @default.
• W2950565167 created "2019-06-27" @default.
• W2950565167 creator A5081995369 @default.
• W2950565167 date "2003-06-01" @default.
• W2950565167 modified "2023-10-15" @default.
• W2950565167 title "Total Synthesis of Marine Cyclic Guanidine Compounds and Development of Novel Guanidine Type Asymmetric Organocatalysts" @default.
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• W2950565167 doi "https://doi.org/10.1248/yakushi.123.387" @default.
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