Synthesis, crystal structure and oxidation of (R)-(+)-8,9-dimethoxy-6,10b-dihydro-5H-thiazolo[2,3-a]isoquinolin-3-one
作者:M.D. Rozwadowska、A. Sulima、A. Gzella
DOI:10.1016/s0957-4166(02)00633-x
日期:2002.10
(R)-(+)-8,9-Dimethoxy-6,10b-dihydro-5H-thiazolo[2,3-a]isoquinolin-3-one 1 has been synthesized from 6,7-dimethoxy-3,4-dihydroisoquinoline and menthyl thioglycolate. Compound 1 was obtained in the enantiomerically pure form (mp 150-153degreesC, [alpha](D) +436) by a single crystallization of the crude reaction product (68% e.e.) from 96% ethanol. The absolute 10bR configuration was established by X-ray diffraction. Oxone oxidation of 1 resulted in a configurationally unstable dextrorotatory syn-sulfoxide 2 (mp 173-175degreesC, [alpha](D) +62.8). (C) 2002 Elsevier Science Ltd. All rights reserved.