Enantioselective Total Synthesis of Callipeltoside A
作者:David A. Evans、Essa Hu、Jason D. Burch、Georg Jaeschke
DOI:10.1021/ja026235n
日期:2002.5.1
An asymmetric totalsynthesis of callipeltoside A has been accomplished highlighted by a catalytic enantioselective vinylogous aldol reaction and a boron-mediated anti-aldol reaction influenced by remote stereocontrol.
通过催化对映选择性乙烯基醛醇反应和受远程立体控制影响的硼介导的抗醛醇反应,已完成了 callipeltoside A 的不对称全合成。
Enantioselective total synthesis of callipeltoside A: two approaches to the macrolactone fragment
作者:David A. Evans、Jason D. Burch、Essa Hu、Georg Jaeschke
DOI:10.1016/j.tet.2008.02.001
日期:2008.5
The enantioselectivetotalsynthesis of callipeltoside A is described. Two syntheses of the macrolactone subunit are included: the first relies upon an Ireland-Claisen rearrangement to generate the trisubstituted olefin geometry and the second utilizes an enantioselective vinylogous aldol reaction for this purpose. Enantioselective syntheses of the sugar and chlorocyclopropane side chain fragments
描述了 callipeltoside A 的对映选择性全合成。包括大环内酯亚基的两种合成:第一种依赖于爱尔兰-克莱森重排来产生三取代的烯烃几何结构,第二种利用对映选择性插烯羟醛反应来实现此目的。还公开了糖和氯代环丙烷侧链片段的对映选择性合成。该天然产物的相对和绝对立体化学通过与侧链片段的两种对映异构体的片段偶联来确定。
Caffyn, Andrew J. M.; Nicholas, Kenneth M., Journal of the American Chemical Society, 1993, vol. 115, # 14, p. 6438 - 6439
作者:Caffyn, Andrew J. M.、Nicholas, Kenneth M.
DOI:——
日期:——
Total Synthesis of (+)-Dactylolide through an Efficient Sequential Peterson Olefination and Prins Cyclization Reaction
作者:Danielle L. Aubele、Shuangyi Wan、Paul E. Floreancig
DOI:10.1002/anie.200500564
日期:2005.5.30
Regiochemical control in the preparation of 2-(nosyloxy) .beta.,.gamma.-unsaturated esters and 4-(nosyloxy) .alpha.,.beta.-unsaturated esters from 1-[(trimethylsilyl)oxy]-1-alkoxy 1,3-dienes
作者:Robert V. Hoffman、Hwa Ok Kim
DOI:10.1021/jo00003a022
日期:1991.2
A series of 1-[(trialkylsilyl)oxy]-1-alkoxy 1,3-dienes 1a-i were found to react with p-nitrobenzenesulfonyl peroxide in the presence of sodium methoxide or zinc chloride to give alkyl 2-[[(p-nitrophenyl)sulfonyl]oxy] beta-gamma-unsaturated esters 3 and alkyl 4-[[(p-nitrophenyl)sulfonyl]oxy] alpha,beta-unsaturated esters 4 which are readily separable. The regioselectivity is determined by kinetic versus thermodynamic control. When positions 2 or 4 of the diene are unsubstituted, the 2-isomer is the major product and is the kinetically fastest formed product. It can be thermally rearranged to the more stable 4-isomer. When alkyl substituents are present at either the 2- or 4-positions, only the 4-isomer is obtained. Substitution for nosylate by amine nucleophiles occurs by an S(N)2 process. Thus 2-amino beta,gamma-unsaturated esters and 4-amino alpha,beta-unsaturated esters can be prepared from the appropriate starting nosylate.