A new route to optically pure highly functionalized tetrahydro-isoquinolines with a quaternary carbon stereocenter
作者:Zbigniew Kałuża、Danuta Mostowicz、Grzegorz Dołęga、Robert Wójcik
DOI:10.1016/j.tet.2008.01.011
日期:2008.3
A facile synthesis of highly substituted, optically pure tetrahydro-isoquinolines with a quaternary carbon stereocenter is described. Glycolic cleavage of 1,2-dihydroxy-hexahydro-pyrrolo-isoquinolines 1 affords a mixture of cyclic hemiacetals, which can be converted via intramolecular chemoselective Cannizzaro reaction into respective β-amino alcohols, whereas the IBX oxidation gives N-formyl aldehydes
描述了具有季碳立构中心的高度取代的光学纯的四氢异喹啉的简便合成方法。1,2-二羟基-六氢-吡咯并-异喹啉1的乙醇裂解提供了环状半缩醛的混合物,可以通过分子内化学选择性Cannizzaro反应将其转化为相应的β-氨基醇,而IBX氧化则得到N-甲酰基醛。我们已经通过合成(+)-6,7-二甲氧基-salsoline-1-羧酸及其新的1-苯基类似物证明了这种合成子的实用性。