The photochemistry of 2-hydroxyiminocyclododecanone
作者:Stewart McLean、James Wong、Peter Yates
DOI:10.1039/c39800000746
日期:——
Irradiation of (E)-2-hydroxyiminocyclododecanone (1) in methanolic solution through quartz with a medium-pressure mercury lamp gives (Z)-2-hydroxyiminocyclododecanone (2), 1-hydroxy-12-hydroxyiminobicyclo[8.2.0]dodecane (3), (2-oxocyclodecane)acetonitrile (6), and methyl undec-10-enoate (7); compounds (3), (6), and (7) are considered to be formed via Norrish type II processes.
New Strategies for the Efficient Synthesis of Medium-Sized Bicyclic γ-Alkylidenebutenolides Based on Regioselective Cyclizations of 1,3-Bis(trimethylsilyloxy)-1,3-butadienes with Oxalyl Chloride
作者:Peter Langer、Tobias Eckardt、Nehad N. R. Saleh、Inass Karimé、Peter Müller
efficiently prepared by Me3SiOTf-catalyzed cyclization of cyclic bis(silyl enol ethers) with oxalyl chloride. In addition, a new strategy for the synthesis of medium-sized bicyclic hybrids of butenolides and medium-sized cyclic ethers− based on sequential [3+2] cyclization of 1,3-bis(trimethylsilyloxy)-1,3-butadienes, Mitsunobu reaction, and ring-closing metathesis − is reported.
Regioselective Synthesis of Medium-Sized Bicyclic Butenolides by Lewis Acid Catalyzed Cyclization of Cyclic 1,3-Bis(trimethylsilyloxy)-1,3-butadienes with Oxalyl Chloride
作者:Peter Langer、Nehad N. R. Saleh
DOI:10.1021/ol006419b
日期:2000.10.1
[GRAPHICS]A new strategy for the synthesis of medium-sized bicyclic gamma-alkylidenebutenolides is reported which involves Me3SiOTf-catalyzed cyclization of cyclic 1,3-bis(trimethylsilyloxy)-1,3-butadienes with oxalyl chloride.
Synthesis of Cyclic Bis(trimethysilyl) Enol Ethers and Their [3 + 4] and [3 + 5] Annulation Reactions with Dicarbonyl Electrophiles. Access to Highly Functionalized Tricyclic Ethers Possessing Trans Intrabridgehead Stereochemistry
作者:Gary A. Molander、Bernard Bessières、Paul R. Eastwood、Bruce C. Noll
DOI:10.1021/jo9902547
日期:1999.5.1
The synthesis of cyclic bis(trimethylsilyl) enol ethers from cycloalkanone carboxylates is described. The [3 + 4] and [3 + 5] annulation reactions of these bis(dinucleophilic), synthons with various 1,4- and 1,5-dicarbonyl electrophiles leads to the formation of tricyclic keto ethers with good regio- and stereochemical control. An interesting trans intrabridgehead stereochemistry is observed when using bis(trimethylsilyl) enol ethers derived from nine- to 12-membered ring beta-keto esters.