Efficient Entry to the [2.2.2]-Diazabicyclic Ring System via Diastereoselective Domino Reaction Sequence
作者:Kaila A. Margrey、Alex J. Chinn、Stephen W. Laws、Robert D. Pike、Jonathan R. Scheerer
DOI:10.1021/ol3007056
日期:2012.5.18
A domino reaction sequence involving aldol condensation, alkene isomerization, and intramolecular hetero-Diels–Alder cycloaddition for the synthesis of [2.2.2]-diazabicyclic structures is reported. Excellent diastereofacial control during the cycloaddition is enforced with a removable chiral phenyl aminal diketopiperazine substituent. The reaction sequence rapidly generates molecular complexity and
报道了涉及醛醇缩合,烯烃异构化和分子内杂Diels-Alder环加成反应以合成[2.2.2]-二氮杂双环结构的多米诺反应序列。环加成过程中出色的非对面控制是通过可移动的手性苯基氨基二酮哌嗪取代基来实现的。反应序列迅速产生分子复杂性,并且与可烯化和不可烯化的醛底物均能胜任(总共九个实例)。还公开了在合成[2.2.2]-二氮杂双环天然产物家族中的典型成员的马来酰胺B的进展。