Semi-synthesis and insecticidal activity of spinetoram J and its D-forosamine replacement analogues
作者:Kai Zhang、Jiarong Li、Honglin Liu、Haiyou Wang、Lamusi A
DOI:10.3762/bjoc.14.207
日期:——
D-forosamine replacement analogues of spinetoram J were synthesized based on the improved semi-synthesis, and their insecticidal activities were evaluated against third-instar larvae of Plutella xylostella. Although none of the analogues were as potent as spinetoram, a few of the analogues have only a 20-40 times lower activity than spinetoram. In particular, one of these analogues was approximately as
There is provided a process for the selective anomeric deacetylation of sugar derivatives, which may be substituted by substituents such as acetoxy, chloracetoxy, alkoxy, azido, etc., by means of tin compounds R.sub.3 SnOR' or R.sub.2 SnO where R is lower alkyl resulting either directly in the desired anomeric compound or in an intermediate which is converted to the desired compound by silica or by acid hydrolysis.
Triflic Imide‐Catalyzed Glycosylation of Disarmed Glycosyl
<i>ortho</i>
‐Isopropenylphenylacetates and
<i>ortho</i>
‐Isopropenylbenzyl Thioglycosides
作者:Zhi Qiao、Peng Wang、Jingxuan Ni、Dongwei Li、Yao Sun、Tiantian Li、Ming Li
DOI:10.1002/ejoc.202101367
日期:2022.1.17
ortho-isopropenylphenylacetates and ortho-isopropenylbenzyl thioglycosides has been established. Mechanistically, the reaction involves the preferential protonation of the isopropenyl group, the generation of reactive glycosylating species by the cation-triggering intramolecular cyclization, and the ensuing glycosylation event.
Dehydrative Thioglycosylation of 1-Hydroxyl Glycosides Catalyzed by In Situ-Generated AlI<sub>3</sub>
作者:Shiue-Shien Weng、Kun-Yi Hsieh、Zih-Jian Zeng
DOI:10.1002/jccs.201600828
日期:2017.5
Thioglycosylation of 1‐hydroxyl glycosides catalyzed by in situ‐generated AlI3 from elemental aluminium and molecular iodine has been developed. This method provides an alternative route to access anomeric thioglycosides without the use of hazard Lewis acidic activators or per‐modified activated thiol sources. The major advantages of this dehydrative procedure are environmental friendly, ease of operation