Novel analogues of ascomycin with modifications in the amino acid unit through photochemistry: the synthesis of 5,6-dehydroascomycin, SDZ ASQ 871
作者:Murty A.R.C. Bulusu、Peter Waldstätten、Gerhard Schulz、Maximilian Grassberger
DOI:10.1016/j.tetlet.2004.02.013
日期:2004.3
and propanol resulted in alkoxylation of the pipecolic acid moiety in the ε-position with concomitant reduction in the tricarbonyl region leading to 6-alkoxy-9-hydroxy derivatives in high stereoselectivities and good yields. The products, after reoxidation of the C(9)-OH, afforded the 6-alkoxy analogues of the parent compounds. Elimination of MeOH from the photoproducts, followed by oxidation gave
在MeOH,EtOH和丙醇中照射子囊霉素1a及其衍生物会导致ε位上的胡椒酸部分进行烷氧基化,并伴随三羰基区域的还原,从而以高立体选择性和高收率得到6-烷氧基-9-羟基衍生物。在C(9)-OH再氧化后,产物得到母体化合物的6-烷氧基类似物。从光产物中除去MeOH,然后氧化,得到相应的5,6-脱氢氨基酸类似物。类似地,可以从脯氨酸类似物7开始,在吡咯烷部分中进行修饰。