Practical Asymmetric Synthesis of Bioactive Aminotetralins from a Racemic Precursor Using a Regiodivergent Resolution
作者:Robert Webster、Alistair Boyer、Matthew J. Fleming、Mark Lautens
DOI:10.1021/ol1022239
日期:2010.12.3
Catalyst-controlled asymmetric ring opening of a racemic oxabicyclic alkene leads to two readily separable regioisomeric products both in excellent ee. A cationic Rh catalyst, with added NH4BF4 to modulate reactivity, was required to obtain synthetically useful yields. The utility of each substituted aminotetralin product has been demonstrated by their conversion to different biologically relevant
Heteroatom-directed Wacker oxidations. A protection-free synthesis of (−)-heliophenanthrone
作者:Parag Mukherjee、Tarun K. Sarkar
DOI:10.1039/c2ob07095b
日期:——
of (−)-heliophenanthrone has been achieved without any protection–deprotection protocol at an overall yield of 28%. Key features of this synthesis comprise a heteroatom-directed Wackeroxidation of an internalcyclicolefin in addition to asymmetric Brown allylation and ring closing metathesis (RCM).