作者:Wei He、Jie Huang、Xiufeng Sun、Alison J. Frontier
DOI:10.1021/ja0761986
日期:2008.1.1
The totalsynthesis of racemic merrilactone A (a neurotrophic agent) is described, featuring simultaneous and stereospecific creation of the C4 and C5 stereocenters via a notable silyloxyfuran Nazarov cyclization. Full details of the successful synthetic strategy are given, as well as several examples of the interesting reactivity of intermediates that were prepared and studied during the execution
A synthesis of the tetracyclic decalin part of azadirachtin in the naturally occurring form is described. The key reactions involve the Corey-Bakshi-Shibata (CBS) asymmetric reduction of the ketone, and an intramolecular Diels - Alder (IMDA) reaction.
Synthesis of the Syributins and Formal Total Synthesis of Syringolide 1.
作者:Romina Di Florio、Mark A. Rizzacasa
DOI:10.1071/ch99170
日期:——
A synthesis of syributins 1 (5) and 2 (6) from D-glyceraldehyde acetonide (12)and furans (14) and (15) is described. Compounds (5) and (6) are cometabolitesof the novel non-proteinaceous C-glycosidic elicitormolecules the syringolides 1 (1) and 2 (2). Under a variety of acidicconditions, the intermediate butenolides (9) and (10) provided syributins 1(5) and 2 (6). Similar results have been reported
The detailed examination of intramolecular Diels - Alder reactions of several structurally related trienes led to construction of the desired tricyclic decalin moiety of azadirachtin with the α-hydroxyl groups at C1 and C3 as the oxygenated substituent at C8 in the naturally occurring form in good yields.