Total Syntheses and Biological Evaluation of Both Enantiomers of Several Hydroxylated Dimeric Nuphar Alkaloids
作者:Alexander Korotkov、Hui Li、Charles W. Chapman、Haoran Xue、John B. MacMillan、Alan Eastman、Jimmy Wu
DOI:10.1002/anie.201503934
日期:2015.9.1
Herein, we describe the first total syntheses of five members of the dimeric nuphar alkaloids: (+)‐6,6′‐dihydroxythiobinupharidine (+)‐1 a, (+)‐6‐hydroxythiobinupharidine (+)‐1 b, (−)‐6,6′‐dihydroxythionuphlutine (−)‐2 a, (−)‐6,6′‐dihydroxyneothiobinupharidine (−)‐3 a, and (+)‐6,6′‐dihydroxyneothionuphlutine (+)‐4 a. The latter two have not been found in nature. We have also made each of their enantiomers
在此,我们描述了二聚体Nuphar生物碱的五个成员的第一个总合成物:(+)-6,6'-二羟基硫代双up啶(+)- 1a,(+)-6-羟基硫代双up啶(+)- 1b,(- )-6,6'- dihydroxythionuphlutine( - ) - 2,( - ) - 6,6'- dihydroxyneothiobinupharidine( - ) - 3,和(+) - 6,6'- dihydroxyneothionuphlutine(+) - 4。后两者在自然界中尚未发现。我们还制作了它们的每个对映体(−)‐ 1 a – b,(+)‐ 2 a,(+)‐ 3 a和(−)‐ 4 a。这些合成的关键步骤是手性Lewis酸配合物使α-氨基腈(其相应的半胱氨酸的水解稳定替代物)二聚。对于那些在CD 3 OD中获得NMR光谱的情况,我们也将(+)- 1 a – 1 b的文献结构重新分配给了它们相应的CD