Recherches sur la synthese totale des alcaloides appartenant a la serie de la carpaine et de la cassine—III
作者:E. Brown、E. Guilmet、J. Touet
DOI:10.1016/0040-4020(73)80178-4
日期:1973.1
reagent of 1-bromo 4-methyl pent-3-ene 24 with an appropriate aldehyde, followed by oxidation, dioxolane formation and ozonolysis. Compounds of type 1 should prove useful in the total synthesis of carpaine, cassine and related alkaloids.
A new strategy of tandem transetherification–intramolecular hetero Diels–Alder reaction with (E,Z)-mixture of ethyl 2-nitro-3-ethoxyacrylate and δ,ε-unsaturated alcohols leading to functionalized trans-fused bicyclic nitronates
作者:Eiji Wada、Masahiko Yoshinaga
DOI:10.1016/j.tetlet.2004.01.026
日期:2004.3
Tandem reaction of (E,Z)-ethyl 2-nitro-3-ethoxyacrylate (E:Z=25:75) with delta,epsilon-unsaturated alcohols leading to functionalized trans-fused bicyclic nitronates as single stereoisomers in high yields has been developed under thermal condition and in the presence of a catalytic amount of a Lewis acid catalyst such as Yb(OTf)(3). This process involves the configuration control of transetherified intermediates under a rapid, reversible transetherification reaction pathway for affording stereoselective trans-fused cyclic nitronates as single stereoisomers in intramolecular hetero Diels-Alder reaction. (C) 2001 Elsevier Ltd. All rights reserved.
Highly Efficient Chemical Kinetic Resolution of Bishomoallylic Alcohols: Synthesis of (<i>R</i>)-Sulcatol
作者:Shui-Ling Chen、Qi-Ying Hu、Teck-Peng Loh
DOI:10.1021/ol048608q
日期:2004.9.1
A highly efficient chemical kinetic resolution of bishomoallylic alcohols was developed when the alcohols underwent In(OTf)(3)-catalyzed 3,5-oxonium-ene-type cyclization with steroidal aldehyde 2. Consistently high enantiomeric excess (up to >99%) was obtained.
Stereocontrolled synthesis of trans-2,5-disubstituted tetrahydrofurans
作者:Pauline C. Ting、Paul A. Bartlett
DOI:10.1021/ja00321a030
日期:1984.5
BROKA, CHRIS A.;LIN, YI-TSONG, J. ORG. CHEM., 53,(1988) N 25, C. 5876-5885