Total Synthesis and Stereochemical Revision of 4,8-Dihydroxy-3,4-dihydrovernoniyne
作者:Suresh Kanikarapu、Kanakaraju Marumudi、Ajit C. Kunwar、Jhillu S. Yadav、Debendra K. Mohapatra
DOI:10.1021/acs.orglett.7b01620
日期:2017.8.18
The first asymmetric total synthesis of two possible diastereomers (4S,5R)-4,8-dihydroxy-3,4-dihydrovernoniyne 5 and (4S,5S)-4,8-dihydroxy-3,4-dihydrovernoniyne 5a is accomplished. Salient features of the synthesis involve Cadiot–Chodkiewicz coupling and Sonogashira cross-coupling of terminal acetylenes. Detailed comparison of the 1H and 13C NMR data and specific rotation with that of the natural product
两种可能的非对映异构体(4 S,5 R)-4,8-二羟基-3,4-二氢过壬二炔5和(4 S,5 S)-4,8-二羟基-3,4-二氢过壬二炔5a的第一个不对称全合成完成。合成的显着特征包括末端乙炔的Cadiot-Chodkiewicz偶联和Sonogashira交叉偶联。1 H和13 C NMR数据以及比旋光度与天然产物的详细比较导致将天然产物的绝对立体化学修改为(4 S,5 S)-4,8-二羟基-3,4 -dihydrovernoniyne 5a。