Enantiospecific Synthesis of (<i>R</i>)-4-Amino-5-oxo-1,3,4,5-tetrahydrobenz[<i>cd</i>]indole, an Advanced Intermediate Containing the Tricyclic Core of the Ergots
作者:Clarence R. Hurt、Ronghui Lin、Henry Rapoport
DOI:10.1021/jo981723s
日期:1999.1.1
We report a new strategy for the enantiospecific synthesis of (R)-4-amino-5-oxo-1,3,4,5-tetrahydrobenz[cd]indole. This compound is an advanced intermediate which contains the tricyclic core of many of the tetracyclic ergot alkaloids. Our method involves the initial synthesis of D-4-bromotryptophan from the coupling of an indolyllithium species with a masked serinal. The alpha-amino position was protected
我们报告了(R)-4-氨基-5-氧代-1,3,4,5-四氢苯并[cd]吲哚的对映体特异性合成的新策略。该化合物是高级中间体,其中包含许多四环麦角生物碱的三环核心。我们的方法涉及从吲哚基锂物种与掩蔽的丝氨酸的偶联初始合成D-4-溴色氨酸。α-氨基位置被N-三苯甲基保护,确保在随后的有机金属环化反应中该位置的对映体完整性。通过用BOC基团保护吲哚氮或将α-氨基酮还原为相应的β-氨基醇,可实现三环的稳定。