Enantioselective intramolecular α-amidoalkylation reaction in the synthesis of pyrrolo[2,1-a]isoquinolines
作者:Asier Gómez-SanJuan、Nuria Sotomayor、Esther Lete
DOI:10.1016/j.tetlet.2012.02.057
日期:2012.4
capable of carrying out the intramolecular α-amidoalkylation of a tertiary N-acyliminium ions when a methoxylated benzene ring is used as internal π nucleophile. The reaction can be applied to the synthesis of pyrrolo[2,1-a]isoquinolines and use of the sterically congested acid 3e is determinant to obtain good levels of enantioselection.
当使用甲氧基化的苯环作为内部π亲核试剂时,BINOL衍生的手性布朗斯台德酸能够进行叔N-酰基亚胺离子的分子内α-酰胺烷基化反应。该反应可用于吡咯并[2,1- a ]异喹啉的合成,并且决定性使用空间拥挤的酸3e以获得对映体的良好水平。
Synthesis of a tetracyclic core of Erythrina alkaloids and analogs of crispine A
Both enantiomers of C10b methyl analogs of crispine A and a tetracyclic core of Erythrinaalkaloids were synthesized starting from l-aspartic acid via a common chiral N-arylethyl succinimide intermediate. The pivotal C10a-C10b bond formation and construction of the C10b stereogenic center were achieved via diastereoselective N-acyliminium ion cyclization. The dibenzylamino group gave stereochemical