Two Ene–Yne Metathesis Approaches to the Total Synthesis of Amphidinolide P
摘要:
The total synthesis of amphidinolide P was achieved through two different ene-yne metathesis, approaches. In each approach, the metathesis step was performed at late stages in the synthesis with all other functionality present. By forging two successful pathways to the synthesis of 1, some of the strengths and weaknesses of metathesis-intensive synthetic strategies were identified.
Chiral titaniumcomplex (1), prepared in situ from optically pure binaphthol and diisopropoxytitanium dihalide in the presence of molecular sieves, is shown to catalyze the additionreactions of crotylsilanes and -stannanes to glyoxylates to afford (syn)-α-hydroxy-β-methyl esters in highly scalemic forms with high diastereoselectivity.
Asymmetric Total Synthesis of Dibenzocyclooctadiene Lignan Natural Products
作者:Robert S. Coleman、Srinivas Reddy Gurrala、Soumya Mitra、Amresh Raao
DOI:10.1021/jo051525i
日期:2005.10.1
Full details of the asymmetric total syntheses of the dibenzocyclooctadienelignans interiotherin A, angeloylgomisin R, gomisin O, and gomisin E (epigomisin O) are presented. The syntheses were based on a unified synthetic strategy involving a novel crotylation using the Leighton auxiliary that occurred with excellent asymmetric induction (>98:2 enantiomeric ratio), a diastereoselective hydroboration/Suzuki−Miyaura
Studies in Organosilicon Chemistry. XXXIX. The Addition of Silanes to Isoprene
作者:ISAO SHIIHARA、WESLEY F. HOSKYNS、HOWARD W. POST
DOI:10.1021/jo01068a085
日期:1961.10
Stereospecific, Enantioselective Allylation of ?-Hydrazono Esters by Using Allyltrichlorosilanes with BINAP Dioxides as Neutral-Coordinate Organocatalysts
作者:Chikako Ogawa、Masaharu Sugiura、Sh? Kobayashi
DOI:10.1002/anie.200461312
日期:2004.12.3
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