Heterocycle formation through aza-annulation: A stereochemically controlled route to (±)-lupinine.
摘要:
The aza-annulation of an acyclic beta-enaminoester with acryloyl chloride was found to be a very efficient method for nitrogen heterocycle formation. Stereospecific hydrogenation of the unsaturated dihydropyridone generated from aza-annulation gave a single disubstituted lactam product. The cis stereochemical relationship of the substituents was confirmed by transformation of the lactam to (+/-)-lupinine.
A formal total synthesis of anti - Helicobacter pylori agent (+)-spirolaxine methyl ether
作者:Sunita K. Gadakh、Arumugam Sudalai
DOI:10.1016/j.tetlet.2015.11.047
日期:2016.1
A convergent, formal enantioselective synthesis of anti-Helicobacter pylori agent, (+)-spirolaxinemethylether 2 has been achieved in high enantiomeric purity starting from commercially available 1,5-pentanediol. The strategy mainly comprises of the Noyori’s asymmetric reduction and Brown allylation/Cu-catalyzed lactonization as the key step for the construction of key chiral intermediates, spiroketal
Total Synthesis and Structural Reassignment of Lyngbyaloside C Highlighted by Intermolecular Ketene Esterification
作者:Chia-Fu Chang、Eric Stefan、Richard E. Taylor
DOI:10.1002/chem.201502132
日期:2015.7.20
classic macrolide, isolated from Lyngbya bouilloni, has shown moderate anticancer activity against several cancer cell lines. Here, we report the first totalsynthesis and stereochemical configuration reassignment of lyngbyaloside C. The synthesis highlights a one‐pot intermolecular ketene esterification reaction to form the crucial tertiary ester and tetrahydropyran. In addition, a novel and concise
Heterocycle formation through aza-annulation: A stereochemically controlled route to (±)-lupinine.
作者:K. Paulvannan、Jacob B. Schwarz、John R. Stille
DOI:10.1016/s0040-4039(00)60550-6
日期:1993.1
The aza-annulation of an acyclic beta-enaminoester with acryloyl chloride was found to be a very efficient method for nitrogen heterocycle formation. Stereospecific hydrogenation of the unsaturated dihydropyridone generated from aza-annulation gave a single disubstituted lactam product. The cis stereochemical relationship of the substituents was confirmed by transformation of the lactam to (+/-)-lupinine.
Folding strain stereocontrol in cyclohexane ring formation by means of an intramolecular ester enolate alkylation reaction
作者:Takashi Tokoroyama、Hisashi Kusaka
DOI:10.1139/v96-279
日期:1996.12.1
Diastereoselectivity in the cyclization of ethyl 7-bromo-2-methylheptanoates with an additional substituent at various positions in the chain, by LDA treatment, was investigated in connection with ...