已经实现了倍半萜烃月桂烯的全合成,包括酮甲基化的非表观异构化方法。结果表明,Corey和Kwiatkowski的膦酸双(二甲酰胺)法和Kuwajima的亚磷酸酯热解法均未发生表观不对称。然而,对于目前的情况,最近发表的Coates方法[ J. Am。化学 Soc。94,4758(1972)]是优选的。
Anhydrous ferric chloride adsorbed on silica gel induced ring enlargement of tertiary cyclobutanols
作者:A. Fadel、J. Salaün
DOI:10.1016/s0040-4020(01)96434-8
日期:1985.1
The reagent obtained by mixing anhydrous FeCl3 and silica gel induced, in dry medium, dehydration and specific C4 → C5 ringenlargement of tertiary cyclobutanols, cyclization of olefinic alcohols and cleavage of tetrahydropyranyl ethers.
Unified approach to the sesquiterpenoids, lauranes and cyclolauranes: Total synthesis of (±)-isolaurene
作者:Sovan Niyogi、Arindam Khatua、Vishnumaya Bisai
DOI:10.1016/j.tetlet.2019.07.032
日期:2019.8
A general approach to the totalsynthesis of sesquiterpene, isolaurene (1a) and cyclolaurene (2a) is featured from commercially available 3-methyl cyclopenten-2-one. The strategy includes a Stork-Danheiser sequence concomitant with a Ni(II)-catalyzed conjugate addition of methyl group onto 3-aryl 2-methyl cyclopenten-2-one to afford the advanced intermediate 11. A methyllithium addition onto compound
Laurene, a new sesquiterpene hydrocarbon fromLaurencia glandulifera Kützing and L. nipponica Yamada, is shown to possess structure I. Isolaurene (IV) and epilaurene (XX) have been synthesized.
Stereochemical evidence for a carbonium ion rearrangement during reaction of dimethyltitanium dichloride with a ketone
作者:Gary H. Posner、Timothy P. Kogan
DOI:10.1039/c39830001481
日期:——
Racemization during the reaction of dimethyltitanium dichloride with the 2,2-disubstituted cyclopentanone (–)-(3) of high enantiomeric purity provides stereochemicalevidence for a carboniumionrearrangement during this dimethylation process.