189. The alkaloids of Tylophora crebriflora: structure and synthesis of tylocrebrine, a new phenanthroindolizidine alkaloid

189. The alkaloids of Tylophora crebriflora: structure and synthesis of tylocrebrine, a new phenanthroindolizidine alkaloid Phenanthroindolizidine alkaloids from Tylophora tanakae Alkaloids from Tylophora indica Alkaloids of Tylophora II: Structural Studies Alkaloids of Tylophora II: Structural Studies Alkaloids of Tylophora I: Isolation of Six New Alkaloids Synthesis of phenanthroindolizidines. II. The synthesis of (±)-tylocrebrine, (±)-tylophorine, (±)-antofine, and (±)-2,3-dimethoxyphenanthroindolizidine Rare Phenanthroindolizidine Alkaloids and a Substituted Phenanthrene, Tyloindane, from Tylophora indica Rare Phenanthroindolizidine Alkaloids and a Substituted Phenanthrene, Tyloindane, from Tylophora indica Minor alkaloids of Tylophora hirsuta☆