Synthesis and Isomerization of Optical Active 2-((6,7,8,9-Tetrahydro-5H-cyclohepta(b)pyridin-9-yl)-sul-finyl) - 1H-benzimidazole Analogs.
作者:Shin-ichi YAMADA、Sen-ichi NARITA
DOI:10.1248/cpb.42.1679
日期:——
Four stereoisomers, (Rs, 9R)-(+)-5, (Ss, 9R)-(-)-5, (Ss, 9S)-(-)-5 and (Rs, 9S)-(+)-5, were prepared from optically active (R)-(+)-3 and (S)-(-)-3, and their absolute structures were unambiguously determined by X-ray crystallographic analysis of (Ss, 9R)-(-)-5. Epimerization of the carbon bearing the sulfinyl group of 5 could be carried out with NaOCH3. At the same time, it found that the stereochemistries of the sulfinyl group of (Rs, 9R)-(+)-5 and (Ss, 9S)-(-)-5 were spontaneously inverted in MeOH solution at room temperature.
通过对 (Ss,9R)-(-)-5 进行 X 射线晶体分析,明确确定了它们的绝对结构。5 中带有亚磺酰基的碳可以用 NaOCH3 进行外聚。同时还发现,在室温下的 MeOH 溶液中,(Rs, 9R)-(+)-5 和 (Ss, 9S)-(-)-5 的亚磺酰基的立体化学结构自发颠倒。