[GRAPHICS]The diastereoselective hetero-Diels-Alder reaction between Danishefsky's diene and chiral aldehydes is catalyzed by chiral chromium-Schiff base complexes. High levels of catalyst control are obtained in several cases, allowing access to all four stereoisomeric products through appropriate choice of aldehyde and catalyst enantiomers.
An Efficient, Second-Generation Synthesis of the Signature Dioxabicyclo[3.2.1]octane Core of (+)-Sorangicin A and Elaboration of the (<i>Z</i>,<i>Z</i>,<i>E</i>)-Triene Acid System
作者:Amos B. Smith,、Shuzhi Dong
DOI:10.1021/ol802942j
日期:2009.3.5
An efficient, second-generation synthesis of the signature dioxabicyclo[3.2.1]octane core of (+)-sorangicin A (1), in conjunction with an effective, stereocontrolled protocol to arrive at the requisite (Z,Z,E)-triene acid system has been developed. Highlights of the core construction entail a three-component union, a KHMDS-promoted epoxide ring formation−ring opening cascade, a Takai olefination, and
(+)-sorangicin A ( 1 )的特征二氧杂双环 [3.2.1] 辛烷核心的高效第二代合成,结合有效的立体控制协议,以达到必要的 ( Z , Z , E )-开发了三烯酸体系。核心结构的亮点包括三组分结合、KHMDS 促进的环氧化物环形成-开环级联、Takai 烯化和化学选择性 Sharpless 二羟基化。然后通过与 ( Z , Z )-5-三丁基甲锡烷基-2,4-戊二烯酸乙酯的 Stille 交叉偶联实现三烯酸系统的组装,然后通过温和水解保持三烯构型。
Enantioselective Formal Total Synthesis of (+)-Aspergillide C
作者:Joseph D. Panarese、Stephen P. Waters
DOI:10.1021/ol902154p
日期:2009.11.5
An enantioselective formal total synthesis of the cytotoxic macrolide (+)-aspergillide C has been accomplished from (S)-(−)-glyceraldehydeacetonide and the Danishefsky−Kitahara diene. Strategic transformations include a hetero Diels−Alder reaction, Ferrier-type addition, and palladium-catalyzed oxidative lactonization to set key stereocenters within the dihydropyran core, followed by fragment coupling
细胞毒性大环内酯 (+)-曲霉内酯 C 的对映选择性正式全合成已从 ( S )-(-)-甘油醛丙酮化物和丹麦谢夫斯基-北原二烯完成。战略转化包括杂 Diels-Alder 反应、Ferrier 型加成和钯催化氧化内酯化以在二氢吡喃核心内设置关键立体中心,然后通过 ( E ) 选择性 Julia-Kocienski 烯化进行片段偶联。
Cram rule selectivity in the Lewis acid catalyzed cyclocondensation of chiral aldehydes. A convenient route to chiral systems of biological interest
作者:Samuel Danishefsky、Susumu Kobayashi、James F. Kerwin
DOI:10.1021/jo00349a037
日期:1982.5
DANISHEFSKY, S.;KOBAYASHI, SUSUMU;KERWIN, J. F., J. ORG. CHEM., 1982, 47, N 10, 1981-1983
作者:DANISHEFSKY, S.、KOBAYASHI, SUSUMU、KERWIN, J. F.